Update on the pathogenesis of vitiligo | Anais Brasileiros de Dermatologia

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Os melanócitos afetados pelo estresse oxidativo (EO) provocam a ativação da imunidade inata por meio da secreção de exossomos, que contêm padrões moleculares associados a danos (DAMPs), especialmente a heat shock protein 70 (HSP70). A HSP70 estimula a secreção de IFN‐α pelas células dendríticas na fase inicial da progressão da doença, que induz a produção das quimiocinas CXCL9 e CXCL10 pelos ceratinócitos e o recrutamento de células T com expressão do receptor CXCR3. CXCL10 apresenta ação efetora, enquanto CXCL9 atua no recrutamento global de células T CD8+ autorreativas. Células T CD8+ efetoras são responsáveis pela destruição dos melanócitos mediante a produção de interferon gama (IFN‐γ), liberação de granzimas e perforinas, facilitada pela disfunção de células T regulatórias (Treg). As células T residentes de memória (TRM) CD8+ se desenvolvem após o início da resposta imune mediada por células T e estão implicadas na manutenção da doença, sendo retidas no tecido em virtude da transapresentação de IL15 pelos ceratinócitos. 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[ "nombre" => "Caio César" "apellidos" => "Silva de Castro" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "b" "identificador" => "aff0010" ] ] ] 2 => array:3 [ "nombre" => "Vinicius Medeiros" "apellidos" => "Fava" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "c" "identificador" => "aff0015" ] ] ] 3 => array:3 [ "nombre" => "Paula Hitomi" "apellidos" => "Sakiyama" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "d" "identificador" => "aff0020" ] ] ] 4 => array:3 [ "nombre" => "Gerson" "apellidos" => "Dellatorre" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "a" "identificador" => "aff0005" ] ] ] 5 => array:4 [ "nombre" => "Hélio Amante" "apellidos" => "Miot" "email" => array:1 [ 0 => "helio.a.miot@unesp.br" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "e" "identificador" => "aff0025" ] 1 => array:2 [ "etiqueta" => "*" "identificador" => "cor0005" ] ] ] ] "afiliaciones" => array:5 [ 0 => array:3 [ "entidad" => "Medical Residency in Dermatology, Hospital Irmandade Santa Casa de Misericórdia de Curitiba, Curitiba, PR, Brazil" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Escola de Medicina, Pontifícia Universidade Católica do Paraná, Curitiba, PR, Brazil" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "The Research Institute of the Mcgill University Health Centre, Montreal, QC, Canada" "etiqueta" => "c" "identificador" => "aff0015" ] 3 => array:3 [ "entidad" => "Universidade Estadual do Oeste do Paraná, Cascavel, PR, Brazil" "etiqueta" => "d" "identificador" => "aff0020" ] 4 => array:3 [ "entidad" => "Department of Dermatology, Faculty of Medicine, Universidade Estadual Paulista, Botucatu, SP, Brazil" "etiqueta" => "e" "identificador" => "aff0025" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" 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The OS promotes the transpresentation of I-15 in keratinocytes through the binding of IL-15 to the heterodimeric IL-15 receptor (IL15R) on memory CD8 + T lymphocytes, consisting of CD122 and CD132, and to the I-15α receptor (IL15Rα) on keratinocytes (CD215). This process potentiates the activation of memory CD8 + T Cells and the production of inflammatory cytokines, such as IFNy, via JAK/STAT signaling (JAK1-STAT3 and JAK3-STAT5). The IFNγ/STAT1/CXCL10 axis conducts the autoimmune destruction of melanocytes. IFNγ signals through the IFNγ receptor (IFNγR) to stimulate JAK1/JAK2 and activate STAT1. The activation induces the production of CXCL9 and CXCL10, which signals through the CXCR3 receptor for the recruitment of more autoreactive CD8+ T cells – Source: the authors." ] ] ] "textoCompleto" => "IntroductionVitiligo is a chronic, acquired dyschromia that promotes autoimmune aggression against melanocytes, resulting in hypochromic or achromic macules and patches on the skin and mucous membranes, with possible involvement of hair follicles, in different extensions of the skin, which may accompany systemic manifestations (e.g., sensorineural deafness, uveitis, thyroiditis). Its pathogenesis is multifactorial; however, the exact mechanisms that integrate the individual genetic susceptibility, melanocyte auto aggression, and failure of immune tolerance mechanisms are still not fully elucidated.The prevalence of vitiligo is quite variable around the world, being more frequent in Africa (0.4%), Europe (0.4%), and Oceania (1.2%), than in North America (0.2%) and Asia (0.1%).<a class="elsevierStyleCrossRef" href="#bib0005">1</a> In Brazil, its prevalence varies between 0.46%–0.68% of the population, with no discrepancy between the sexes or racial groups. The mean age of disease onset ranges from 20 to 30 years of age, although it can affect children and the elderly. Vitiligo still accounts for 1.4% to 1.9% of dermatological consultations and up to 3.5% of dermatological consultations in children.<a class="elsevierStyleCrossRefs" href="#bib0010">2,3</a>Although it does not show specific skin symptoms or imply a serious health risk, vitiligo patients are impacted in their quality of life since the disease is associated with a strong stigma that compromises social and professional relationships, self-esteem, and dress codes; with women, adolescents, and patients with psychiatric disorders being the most affected groups.<a class="elsevierStyleCrossRef" href="#bib0020">4</a>There is currently no definitive cure for vitiligo; however, several treatments have shown favorable results, achieving some degree of repigmentation in over 80% of cases.<a class="elsevierStyleCrossRef" href="#bib0025">5</a> The recent advance in the understanding of its pathogenesis has promoted new therapeutic alternatives, which allude to a more hopeful future for patients.Vitiligo geneticsVitiligo is a complex disease in which the risk attributed to the genetic component is estimated at 75% to 83%, whereas environmental factors would comprehend the remaining 20%. Studies of familial grouping, studies in twins, and segregation analyses characterize it as a multifactorial disease with a polygenic inheritance pattern. Because of this, the individual contribution of each genetic variant to susceptibility is relatively low.<a class="elsevierStyleCrossRefs" href="#bib0030">6,7</a>Vitiligo susceptibility mapping by linkage analysisThe mapping of genetic risk factors for vitiligo was performed by linkage analysis followed by positional cloning. Linkage analysis assesses the nonrandom segregation of chromosomal regions among affected individuals in families with vitiligo. Seven loci have been linked to vitiligo susceptibility, of which four were observed in European populations and three in Chinese populations. One locus on chromosome 17p13 was the first genomic region linked to vitiligo associated with autoimmune diseases.<a class="elsevierStyleCrossRef" href="#bib0040">8</a> And the positional cloning of the 17p13 region identified the NLRP1 gene as the likely source of the vitiligo linkage signal.<a class="elsevierStyleCrossRefs" href="#bib0045">9,10</a>Chromosome 22q12 has been associated with the pathogenesis of vitiligo,<a class="elsevierStyleCrossRefs" href="#bib0040">8,11</a> with the variants that regulate XBP1 gene expression being the risk factor indicated in the 22q12 region.<a class="elsevierStyleCrossRef" href="#bib0060">12</a>XBP1 is a transcription factor that regulates the expression of the HLA class II gene, being involved in cellular response to stress and often associated with autoimmune diseases. In Asian and South American individuals, a link between the MHC region on chromosome 6p21 and vitiligo has been observed.<a class="elsevierStyleCrossRefs" href="#bib0030">6,11</a>HLA class I and II-related genes have been implicated in the pathogenesis of vitiligo.<a class="elsevierStyleCrossRefs" href="#bib0065">13,14</a> Fine mapping of HLA by imputation identified amino acid alterations at residues 135 and 45‒46 for HLA-DQB1 and HLA-B, respectively, as strong risk factors for vitiligo in the Chinese population.<a class="elsevierStyleCrossRef" href="#bib0075">15</a> Moreover, a promoter variant that increases HLA-A*02:01 expression has been associated with common vitiligo.<a class="elsevierStyleCrossRef" href="#bib0080">16</a>Three loci, at 1p31.3 – p32.2, 7q21.11, and 8p12, have been linked to vitiligo susceptibility in Europeans and one in Asian populations at 4q13-q21.<a class="elsevierStyleCrossRefs" href="#bib0085">17–19</a> Of these, FOXD3 has been suggested as the causal gene candidate for 1p31.3 – p32.2 and PDGFRA for 4q13-q21, while no candidate gene has been suggested for the two remaining loci.In addition to these, HLA-A*33, HLA-Aw*31, HLA-DR4, HLA-DR7, and HLA-DQB1*0303, among others, have been identified as risk factors for vitiligo in different samples.<a class="elsevierStyleCrossRefs" href="#bib0100">20,21</a> On the other hand, there are studies that correlate HLA-A*09 and HLA-Aw*19 with a lower risk for the disease.<a class="elsevierStyleCrossRef" href="#bib0105">21</a>In Brazil, a study with patients from the southeast region demonstrated an association of HLA-A*02 and HLA-DRB1*07 with susceptibility to vitiligo.<a class="elsevierStyleCrossRef" href="#bib0100">20</a> HLA-A*02 is also associated with risk in populations from China, India, Slovakia, and Northern Germany. Similarly, HLA-DRB1*07 has been identified in samples from China, India, Slovakia, Italy, Morocco, Turkey, and Oman.<a class="elsevierStyleCrossRef" href="#bib0100">20</a>Additionally, in Brazil, HLA-DQB1*06 has been correlated with susceptibility to vitiligo (common, acrofacial and mixed), while HLA-A*32 has been correlated with the localized form (focal and segmental). However, these findings differ from other descriptions in the literature, suggesting that HLA-DQB1*06 and HLA-A*32 are specifically associated with the Brazilian population.<a class="elsevierStyleCrossRef" href="#bib0100">20</a>Genome-wide association study and vitiligo predictionGWAS (Genome-Wide Association Study) tests a dense set of variants located throughout the human genome for association with a phenotype of interest using both case controls and families. To date, five GWAS have been performed for vitiligo in European and Asian populations.<a class="elsevierStyleCrossRefs" href="#bib0110">22–26</a> Together, they have identified more than 50 loci associated with risk of vitiligo. Most of the loci identified by GWAS were detected in Europeans, suggesting a specific ethnicity effect or differences in study design or power. However, seven of the non-MHC loci were associated with vitiligo in subjects of different ethnicities.The observation of risk effects in independent populations strengthens the global contribution of genes in the pathophysiology of vitiligo. One of these seven multiethnic vitiligo risk factors includes the PTPN22 gene, which encodes a protein tyrosine phosphatase involved in T-cell signaling. Interestingly, PTPN22 variants have been associated with several diseases related to the immune system, including rheumatoid arthritis, systemic lupus erythematosus, and Crohn's disease, which characterizes it as a pleiotropic gene for autoimmune diseases.<a class="elsevierStyleCrossRefs" href="#bib0135">27,28</a>The IKZF4 gene, associated with vitiligo in European and Chinese individuals, exerts a FOXP3-mediated gene silencing on T regulatory cells (Tregs).<a class="elsevierStyleCrossRef" href="#bib0145">29</a> The FOXP3 gene located on the X chromosome was also a risk factor for vitiligo in several ethnicities.Combined, these associations highlight the key players in the contribution of T-cells to the pathogenesis of vitiligo. Other candidate loci for vitiligo in several ethnicities include FASLG, a member of the TNF superfamily, and GZMB, a protease, both of which point to a role of dysregulated apoptosis in vitiligo. Another significant non-HLA association with vitiligo found in Europeans was observed for the TYR gene, which regulates melanin biosynthesis in melanocytes.<a class="elsevierStyleCrossRef" href="#bib0130">26</a>The translational aspect of the GWAS findings goes beyond the description of the mechanisms associated with the disease pathogenesis. The cumulative frequency of vitiligo risk alleles can be used to calculate the probability, using a polygenic risk score, that an individual will become a case. Using autosomal risk variants of vitiligo described by GWAS, the predictive power of the polygenic risk score was found to be 71%, which is among the highest values found for complex diseases.<a class="elsevierStyleCrossRef" href="#bib0150">30</a>Candidate gene approaches are conceptually based on a mechanistic hypothesis. Autoimmunity, melanocyte adhesion, and metabolic dysfunction have been suggested as contributing to the etiology of vitiligo, and several genes based on the above mechanisms have been tested.<a class="elsevierStyleCrossRef" href="#bib0155">31</a> Noteworthy examples include the DDR1 gene, which encodes a transmembrane tyrosine kinase receptor that is the main adhesion protein of melanocytes to the basement membrane and has been shown to be downregulated in vitiligo in comparison to unaffected skin.<a class="elsevierStyleCrossRefs" href="#bib0160">32,33</a> DDR1 forms a complex with E-cadherin (encoded by CDH1), which is important for the maintenance of the epithelial structure. Variants close to the CDH1 gene have been associated with vitiligo in Brazilian individuals, linking defects in melanocyte adhesion to the pathogenesis of vitiligo.<a class="elsevierStyleCrossRef" href="#bib0170">34</a> Melanocyte damage due to excessive oxidative stress is another well-established candidate mechanism for vitiligo. The accumulation of reactive oxygen species in the epidermis can inhibit the BCHE enzymatic activity.<a class="elsevierStyleCrossRef" href="#bib0175">35</a> Variants that control the enzymatic activity of the BCHE gene have been associated with vitiligo in independent samples of the Brazilian population.<a class="elsevierStyleCrossRef" href="#bib0180">36</a>The main genetic changes linked to vitiligo are summarized in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>.<elsevierMultimedia ident="tbl0005"></elsevierMultimedia>Morphofunctional changesIn addition to the significant reduction in melanin and melanocytes, the skin with vitiligo shows morphological changes both in the epithelium and in the upper dermis, which supports the hypothesis that other elements contribute to disease development, in addition to melanocyte susceptibility to oxidative and immunological damage.Histopathologically, less pigmentation in the basal layer is observed in up to 78% of the epidermis with vitiligo, and some inflammatory infiltrate is identified in up to 48% of cases. In vitiligo cases with active disease, histopathology may show a lichenoid interface dermatitis pattern, demonstrating the focus of self-aggression located in the basal layer.<a class="elsevierStyleCrossRef" href="#bib0185">37</a> T-lymphocytes (CD3+), especially the cytotoxic phenotypes (CD8+), are the predominant cells (65.4%) in the infiltrate, which is more evident in perilesional skin with perivascular and periannexal distribution. For this reason, perilesional skin is considered the area with the highest inflammatory activity in vitiligo (<a class="elsevierStyleCrossRefs" href="#fig0005">Figs. 1 and 2</a>).<a class="elsevierStyleCrossRef" href="#bib0190">38</a><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia>Screening of melanin pigmentation using Fontana-Masson staining identified residual melanin in 16% of vitiligo cases, and in 12% of cases, melanocytes were identified in the lesions, demonstrating that total destruction of melanocytes may not occur in the affected area.<a class="elsevierStyleCrossRef" href="#bib0190">38</a>On electron microscopy, abnormal melanogenesis was identified in active vitiligo; melanocytes from the control skin and perilesional area of stable vitiligo lesions showed long, thin dendrites with a moderate number of melanosomes, in contrast to the melanocyte dendrites from the perilesional area of active vitiligo: retractable with few melanosomes.<a class="elsevierStyleCrossRef" href="#bib0195">39</a> Langerhans cells are increased in the epidermis, the basement membrane is thickened, and degenerative alterations (e.g., cytoplasmic vacuolization) in basal melanocytes and keratinocytes are evidenced during disease activity.The role of the remaining melanocytes in the basal layer in the repigmentation process of vitiligo is still unclear, especially because melanogenesis is compromised in the lesions. However, the maintenance of hair follicle pigmentation in an affected area indicates good prognosis since the migration of melanocytes from the outer follicular sheath can be evidenced by the identification of perifollicular repigmentation after phototherapy (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>).The main source of repigmentation in vitiligo is the melanoblasts of the hair outer root sheath, when not attacked by CD8+ T-cells. After stimulation with phototherapy, these melanoblasts migrate, differentiate into melanocytes, and proliferate into the epidermis, probably through the upregulation of the stem cell-associated gene, GLI1.<a class="elsevierStyleCrossRef" href="#bib0200">40</a>The stratum corneum and viable epidermis of vitiligo lesions are increased in thickness compared to non-lesional skin.<a class="elsevierStyleCrossRef" href="#bib0205">41</a> The lesional epithelium also has larger corneocytes, likely to compensate for the decreased expression of cornification components and, therefore, they result in a thicker stratum corneum in vitiligo lesions. A possible explanation for this fact may be the reduced expression of D3 gangliosides, which favors keratinocyte apoptosis in patients with vitiligo. This potentially induces a compensatory mechanism of epidermal thickening to protect the affected skin against ultraviolet radiation (UVR).However, previous optical and electron microscopy studies have demonstrated degenerative changes in keratinocytes in both affected and unaffected skin of patients with vitiligo,<a class="elsevierStyleCrossRef" href="#bib0210">42</a> suggesting that the entire epithelium of patients with vitiligo is susceptible to and suffers from the pathogenic pressures of the disease.In common vitiligo, there is a decrease in the epithelial cones of the dermal-epidermal junction. Similarly, a difference in architecture was identified in patients with segmental and nonsegmental types of vitiligo. In the segmental type, there is a notable increase in epithelial cones; acanthosis is observed in the nonsegmental type when compared with the skin of controls without vitiligo.<a class="elsevierStyleCrossRef" href="#bib0185">37</a>Adhesion defects between cell components of the epidermis have also been implicated in the pathogenesis of vitiligo. E-cadherin is a protein that assists in anchoring between keratinocytes, and its low expression has been identified in melanocytes in vitiligo.<a class="elsevierStyleCrossRef" href="#bib0215">43</a> It was also demonstrated in the dermis, p53-positive cells in non-lesional areas, and this reactivity was higher in vitiligo lesions than in controls.The reduction of melanocytes in vitiligo was also related to a defect in cell adhesion but not directly to apoptosis. Furthermore, cytokines such as IFNγ and TNFα induce melanocyte detachment and decrease the distribution of E-cadherin in melanocytes. However, the combination of the two cytokines was able to downregulate the expression of the CDH1 gene that encodes E-cadherin and also reduced the expression of the genes associated with adhesion deficit, DDR1 and CCN3. Furthermore, MMP-9 is elevated in the skin and plasma of patients with common vitiligo, being produced in keratinocytes by the stimulation of TNFα and IFNγ and associated with E-cadherin cleavage.<a class="elsevierStyleCrossRef" href="#bib0220">44</a>The DKK1 protein, which reduces melanogenesis and certain somatic functions of melanocytes, is overexpressed by lesional fibroblasts in vitiligo.<a class="elsevierStyleCrossRef" href="#bib0225">45</a> Similarly, there is a greater expression of fibronectin, a key protein in intercellular communication by binding to integrins, in the dermis of patients with vitiligo compared with healthy controls.<a class="elsevierStyleCrossRef" href="#bib0215">43</a> Additionally, elastin is reduced in lesional dermis, but collagen fibers show no difference when compared to unaffected skin.<a class="elsevierStyleCrossRef" href="#bib0230">46</a>Oxidative changesCutaneous melanocytes, located in the organ with the greatest interface with the external environment and, consequently, the most exposed to ultraviolet radiation and pollutants, are particularly vulnerable to excessive production of reactive oxygen species (ROS). The concentration of these substances is even higher than in other adjacent cells, such as keratinocytes and fibroblasts. This is due, in part, to their specialized function of producing melanin (which generates by-products such as O2− and H2O2) and inflammation due to excessive photo exposure.<a class="elsevierStyleCrossRefs" href="#bib0235">47,48</a>In the hair follicle, the outer sheath melanocytes are responsible for intense melanin synthesis. There is evidence that the production of ROS in these melanocytes favors white hairs during the aging process, which is also accompanied by loss of protective antioxidant mechanisms, generating an alteration in the oxidative/antioxidative balance (redox status). In an in vitro model of oxidative stress, glutamine (a precursor amino acid of the antioxidant molecule glutathione) was shown to be able to reduce melanocyte apoptosis. In addition to triggering apoptosis, ROS also has the potential to reduce melanogenesis, as demonstrated by in vitro tests following exposure of melanocytes to H2O2.<a class="elsevierStyleCrossRefs" href="#bib0240">48–51</a>The theory of vitiligo development due to oxidative stress (OS) suggests that ROS production would be induced by multiple intrinsic factors (such as inflammation and protein synthesis), as well as extrinsic ones, such as exposure to ultraviolet radiation pollutants, and phenolic compounds. In parallel, a failure in the antioxidant mechanism would occur, disrupting cell homeostasis and culminating in cell damage.<a class="elsevierStyleCrossRef" href="#bib0260">52</a>Melanocytes cultured from unaffected areas in patients with vitiligo have a greater susceptibility to oxidative stress than from controls without vitiligo, demonstrating an overall susceptibility of the patient with vitiligo to oxidative damage.<a class="elsevierStyleCrossRef" href="#bib0265">53</a>There is an increase in the superoxide dismutase enzyme (responsible for degrading the O2− radical into H2O2 and O2), an increase in lipid peroxidation (secondary to OS), in addition to a reduction in the catalase enzyme (which converts H2O2 into H2O and O2) in vitiligo. However, when compared to other inflammatory diseases such as psoriasis and lichen planus, such alterations are also reported, suggesting that the OS pathway is not disease-specific. In contrast, when non-lesional skin is assessed, there are more oxidative pathway alterations in the skin of patients with vitiligo than of patients with other inflammatory skin diseases, suggesting that the depigmented areas are a phenotypically altered part of skin subjected to oxi-reducing imbalance.<a class="elsevierStyleCrossRef" href="#bib0270">54</a>In addition to having a lower systemic antioxidant capacity (glutathione peroxidase reduction) when compared to individuals without vitiligo,<a class="elsevierStyleCrossRef" href="#bib0275">55</a> there are differences in the serum levels of superoxide dismutase (SOD) and reduced glutathione (GSH) between patients with common and localized vitiligo, also assuming a difference in the systemic antioxidant status according to disease severity.<a class="elsevierStyleCrossRef" href="#bib0280">56</a> Polymorphisms of FOXO3A, a gene with an important role in OS regulation, are also found in patients with active vitiligo.<a class="elsevierStyleCrossRef" href="#bib0285">57</a>Treatment with narrowband UVB, in turn, is able to balance the redox status in patients with vitiligo, as demonstrated by the significant reduction in serum malondialdehyde (MDA) levels and an increase in glutathione peroxidase in patients treated by this phototherapy method.<a class="elsevierStyleCrossRef" href="#bib0290">58</a>It is hypothesized that OS inflicts cell damage by inducing apoptosis in melanocytes, as well as other cell death mechanisms, such as ferroptosis and phagoptosis.<a class="elsevierStyleCrossRef" href="#bib0260">52</a> Clinical and biochemical studies suggest that the overexpression of the TRPM2 gene (transient receptor potential cation channel subfamily M member 2) and the CGRP (calcitonin gene-related peptide) peptide are related to OS-sensitive calcium channels in perilesional melanocytes in vitiligo. In these cases, H2O2 would induce the demethylation of the promoter region of the TRPM2 gene and increase its expression in melanocytes, promoting the calcium influx into the cytoplasm, and promoting its apoptosis.<a class="elsevierStyleCrossRef" href="#bib0295">59</a>In a study with murine melanocytes, the natural process of autophagy, in which cells degrade their organelles and damaged proteins to maintain their homeostasis, was also shown to be impaired when excessive ROS accumulation occurs.<a class="elsevierStyleCrossRef" href="#bib0300">60</a> In vitiligo, melanocytes and fibroblasts are more sensitive to OS-induced autophagy, which reduces their potential to control melanogenesis.<a class="elsevierStyleCrossRef" href="#bib0305">61</a>OS can also trigger changes in the melanocyte endoplasmic reticulum, culminating in the accumulation of defective proteins, stimulating a cell stress phenomenon called “unfolded protein response” (UPR).<a class="elsevierStyleCrossRef" href="#bib0310">62</a> Moreover, energy requirements for protein production (such as melanin) alone generate ROS through mitochondrial metabolism. These two pathways seem to be overactivated in the melanocytes of patients with vitiligo, suggesting that these cells tolerate less the demand for melanin production than those of healthy individuals.<a class="elsevierStyleCrossRef" href="#bib0315">63</a> Even healthy melanocytes undergo cell stress when exposed to certain phenolic compounds such as hydroquinone monobenzyl ether, inducing the production of IL6 and IL8.<a class="elsevierStyleCrossRefs" href="#bib0315">63,64</a>Despite the extensive use of antioxidants by patients with vitiligo who seek therapeutic alternatives, the role of this pathogenic mechanism and the application of this knowledge in clinical practice remain controversial. The lack of a consistent response to systemic antioxidants suggests that OS may not play a central role in disease pathogenesis, which raises the need for studies to identify the real role of the mechanism in this complex disease.<a class="elsevierStyleCrossRef" href="#bib0270">54</a><a class="elsevierStyleCrossRef" href="#fig0015">Fig. 3</a> summarizes the possible pathways of damage to melanocytes due to OS in vitiligo.<elsevierMultimedia ident="fig0015"></elsevierMultimedia>In vitiligo, OS also participates in the Köbner phenomenon, although its etiology is probably multifactorial. After epithelial trauma, inflammatory mediators lead to an increase in OS, inducing cell death, a process that is also favored by melanocyte adhesion defects. Additionally, epithelial trauma promotes the release of IFNα, which increases the expression of CXCL10, favoring the migration of circulating lymphocytes.<a class="elsevierStyleCrossRef" href="#bib0325">65</a>Immunological changesInnate immunityEvidence for the participation of the innate immune system in the pathogenesis of vitiligo is very consistent, with the latter being considered the link between oxidative stress and the adaptive immune response.<a class="elsevierStyleCrossRef" href="#bib0330">66</a> First, dendritic cells, macrophages, and NK (natural killer) cells are found in the lesional and perilesional skin of patients with vitiligo, characterizing an activation of the innate immune response.<a class="elsevierStyleCrossRef" href="#bib0335">67</a>Activated NK cells (CD56+ / granzyme B+) and IFNγ-producing cells have been identified in the blood and non-lesional skin of patients with vitiligo.<a class="elsevierStyleCrossRef" href="#bib0340">68</a> Moreover, there is an increase in proinflammatory cytokines, characteristic of innate immunity, in both serum and skin of patients with vitiligo, such as IL1α, IL1β, IL6, IL8, IL12, IL15, and TNFα.<a class="elsevierStyleCrossRef" href="#bib0345">69</a> These elements indicate a global activation of the body innate immunity, transcending the affected areas.The oxidative stress that occurs in the melanocyte, as mentioned before, is possibly the autoimmunity trigger in vitiligo.<a class="elsevierStyleCrossRef" href="#bib0315">63</a> The communication between the melanocyte and the innate immune system seems to occur through the secretion of exosomes, which contain melanocyte-specific antigens, miRNAs, heat shock proteins, and DAMPs (damage-associated molecular patterns).<a class="elsevierStyleCrossRef" href="#bib0320">64</a> These exosomes deliver autoantigens to dendritic cells, which undergo maturation into antigen-presenting cells.<a class="elsevierStyleCrossRef" href="#bib0350">70</a>The DAMP with the highest evidence of association with vitiligo to date is HSP70 (heat shock protein 70).<a class="elsevierStyleCrossRef" href="#bib0330">66</a> HSP70 is a protein from the intracellular chaperone family whose function is to prevent the incorrect folding of other proteins and their aggregation. Whereas some HSPs facilitate the folding of newly formed proteins, others are particularly induced during physiological stress to manage the extra burden of stress-induced protein misfolding, thus preserving cell viability.<a class="elsevierStyleCrossRef" href="#bib0355">71</a> Although HSPs are intracellular proteins, it has been observed that, under stress situations, they can be secreted by the cell. In the extracellular environment, the identification of these proteins by cells of the immune system results in signal transduction that leads to the release of proinflammatory cytokines, such as IFNα. In vitro studies have demonstrated the expression of HSP70 Lox-1 receptors on the surface of dendritic cells in vitiligo. The same study showed that HSP70 induces the maturation and activation of dendritic cells (CD80+).<a class="elsevierStyleCrossRefs" href="#bib0355">71,72</a>The induced HSP70 is present in lesional and perilesional skin in vitiligo. Studies in animal models have demonstrated the relationship between induced HSP70 and the recruitment and activation of inflammatory dendritic cells in vitiligo. Furthermore, in rats, HSP70 has been shown not only to be necessary but sufficient to accelerate skin depigmentation.<a class="elsevierStyleCrossRef" href="#bib0365">73</a> Finally, a study that introduced a mutant HSP70, in which only one amino acid was altered in its structure, showed that it was able to promote skin repigmentation by binding to dendritic cells and inactivating them and, consequently, inhibiting the subsequent T-cell response. This HSP70 molecule with an amino acid change is considered a potential treatment for vitiligo and is expected to be studied in clinical trials.<a class="elsevierStyleCrossRef" href="#bib0370">74</a>NLRP-1 (nuclear localization leucine-rich-repeat protein 1) is another component of innate immunity identified in vitiligo. Variants of the DNA sequence in the NALP1 region are associated with the risk for several epidemiologically associated autoimmune and autoinflammatory diseases, including common vitiligo.<a class="elsevierStyleCrossRef" href="#bib0045">9</a> NLRP-1 is a key regulator of the innate immune response. By recognizing the DAMPs, this receptor activates the inflammasome, which, through the caspase-1 pathway, induces the processing of pro-IL1β into active IL1β, as well as its secretion into the extracellular environment, where it perpetuates the inflammatory response.<a class="elsevierStyleCrossRef" href="#bib0375">75</a> IL1β plays a key role in the polarization of T cells towards Th17.<a class="elsevierStyleCrossRef" href="#bib0380">76</a> The perilesional skin of vitiligo, where the disease is most active, shows an increase in IL1β, suggesting that this pathway is also involved in vitiligo progression.<a class="elsevierStyleCrossRef" href="#bib0385">77</a> Therefore, IL1β inhibition can also be seen as a potential therapeutic target in vitiligo.Adaptive immunityThe activation of innate immunity triggered by damage to melanocytes affected by oxidative stress promotes cytokine secretion and antigen presentation, resulting in the adaptive immune system activation, in which autoreactive T-cells amplify damage to melanocytes in vitiligo-affected skin.In this context, cytotoxic T-lymphocytes (CD8+) are the main cells implicated in disease pathogenesis.<a class="elsevierStyleCrossRef" href="#bib0390">78</a> However, although antibodies reactive against melanocytes (e.g., anti-MelanA, anti-MCHR1, anti-tyrosinase, anti-gp100, and anti-tyrosine hydroxylase) have elevated serum titers in patients with vitiligo, they do not correlate with disease activity.<a class="elsevierStyleCrossRef" href="#bib0395">79</a> Nevertheless, the literature is controversial, and the exact role of anti-melanocyte antibodies in vitiligo remains unclear.The type I IFN pathway is a key point for the start of the vitiligo immune response. The IFN-I signature characterizes an early and transient event in its progression and a link between the innate and adaptive immune response.<a class="elsevierStyleCrossRef" href="#bib0325">65</a> Studies have shown that IFNα, produced mainly by plasmacytoid dendritic cells (pDCs), stimulates the production of chemokines, such as CXCL9 and CXCL10, by keratinocytes, leading to the recruitment of T-cells expressing their receptor: CXCR3.<a class="elsevierStyleCrossRefs" href="#bib0325">65,72</a> Furthermore, HSP70 potentially contributes to skin inflammation by activating pDCs and increasing IFNα secretion.<a class="elsevierStyleCrossRef" href="#bib0360">72</a>Cytotoxic CD8+ T-cells are necessary and sufficient for the destruction of melanocytes, acting as an effector arm of autoimmunity.<a class="elsevierStyleCrossRef" href="#bib0390">78</a> The lesions are caused by effector CD8+ T-lymphocytes in the initial or active phase of the disease and by recirculating and resident memory CD8 + T (TEM) lymphocytes in the stable phase. The mechanism of aggression is based on the production of inflammatory cytokines such as TNFα and IFNγ, in addition to the release of granzymes and perforins, which cause direct damage to melanocytes.<a class="elsevierStyleCrossRefs" href="#bib0390">78,80</a> In the lymphocytic infiltrate of the periphery of the depigmented areas, CD8+ T-lymphocytes predominate, and this finding correlates with disease activity.<a class="elsevierStyleCrossRef" href="#bib0405">81</a>Melanocyte-specific antigens recognized by CD8+ T-cells, such as MelanA, tyrosinase, gp100, and tyrosinase-related proteins 1 and 2, are detected in greater numbers in the peripheral blood of patients with vitiligo when compared to controls.<a class="elsevierStyleCrossRef" href="#bib0410">82</a> The perilesional skin also expresses higher levels of CD8+ T lymphocytes against melanocyte antigens in comparison to normal skin.<a class="elsevierStyleCrossRef" href="#bib0390">78</a> These autoreactive cells are able to destroy melanocytes in vitro<a class="elsevierStyleCrossRef" href="#bib0405">81</a> in addition to inducing apoptosis of keratinocytes and melanocytes in a pattern similar to the disease.<a class="elsevierStyleCrossRef" href="#bib0390">78</a>IFNγ, and the genes it induces, encode the CXCR3 chemokine receptor and its ligands CXCL9 and CXCL10, which are critical for the activation of CD8+ T cells, and are found to be increased in the skin and blood of patients with vitiligo.<a class="elsevierStyleCrossRefs" href="#bib0415">83,84</a> CXCL9 promotes the global recruitment of autoreactive T-cells but with no effector action, whereas CXCL10 is required for disease progression and maintenance.<a class="elsevierStyleCrossRef" href="#bib0425">85</a> Moreover, the neutralization of CXCL10 in animal models prevents the appearance of new lesions and induces the repigmentation of established areas,<a class="elsevierStyleCrossRef" href="#bib0425">85</a> identifying the therapeutic potential of IFNγ/CXCL10/CXCR3 axis inhibition.<a class="elsevierStyleCrossRef" href="#bib0430">86</a> Keratinocytes are the main sources of these cytokines, and CXCL9 and CXCL10 measurements are potential biomarkers of disease activity.<a class="elsevierStyleCrossRef" href="#bib0420">84</a>The Janus kinase/signal transducers and transcription activators (JAK/STAT) pathway participate in the immunopathogenesis of vitiligo through its interaction with IFNγ. IFNγ/CXCL10 signaling starts with the binding of IFNγ to its heterodimeric receptor, which stimulates the JAK/STAT pathway and leads to STAT1 activation. Subsequently, STAT1 translocation to the nucleus and subsequent binding to the IFNγ-induced gene promoter region such as CXCL10 occur. There are four members of the JAK protein family, including JAK1, JAK2, JAK3, and tyrosine kinase 2 (TYK2). JAK1 and JAK2 are directly involved in IFNγ signaling. In this context, some studies have used several JAK inhibitors as a repigmentation strategy.<a class="elsevierStyleCrossRef" href="#bib0435">87</a>Vitiligo recurrence is a common phenomenon, often occurring in the same affected site prior to treatment. This pattern of recurrence suggests the role of autoimmune memory in the maintenance of the condition, characterized by the presence of memory CD8 + T Cells in both the epidermis and dermis, which act as sentinels for the recruitment of T-effector memory cells from the circulation.<a class="elsevierStyleCrossRef" href="#bib0400">80</a> TRMs are long-lived lymphocytes that develop after the start of a T-cell-mediated immune response.Based on the demonstration that TRMs require IL15 for their differentiation, the interruption of the IL15 pathway using an anti-CD122 antibody caused reversal of depigmentation in mice with stable vitiligo. In that trial, short-term treatment with anti-CD122 inhibited IFN-γ production by TRMs, and long-term use depleted these cells from the lesions.<a class="elsevierStyleCrossRef" href="#bib0440">88</a> Additional IL15 functions have also been mapped in other studies. One study showed that IL15 causes the expression of NKG2D in memory CD8 + T Cells in skin with vitiligo, triggering the production of IFNγ and TNFα.<a class="elsevierStyleCrossRef" href="#bib0445">89</a> Additionally, oxidative stress has been shown to induce IL15 transpresentation in keratinocytes, contributing to the activation of memory CD8 + T Cells through the activation of the JAK/STAT pathway (JAK1-STAT3 and JAK3-STAT5).<a class="elsevierStyleCrossRef" href="#bib0450">90</a> Thus, blocking IL15 signaling seems to be promising in the search for new treatments.<a class="elsevierStyleCrossRef" href="#fig0020">Fig. 4</a> details the IL15 transpresentation in keratinocytes induced by oxidative stress and the interaction of IFNγ with the JAK/STAT pathway.<elsevierMultimedia ident="fig0020"></elsevierMultimedia>CD4+ T-regulatory cells (Tregs) act to maintain tolerance to their own tissues by suppressing the activity of T-effector cells. In vitiligo, there is a Treg dysfunction, although it is not known exactly whether due to the inability to migrate to the skin, decreased numbers, or activity suppression.<a class="elsevierStyleCrossRef" href="#bib0455">91</a> In animal models of vitiligo, there is control of disease progression and repigmentation of lesions with the re-establishment of the Treg population.<a class="elsevierStyleCrossRef" href="#bib0460">92</a>Alterations of the adaptive immune system are demonstrated in both segmental and nonsegmental vitiligo, despite different reactivity patterns. In nonsegmental vitiligo, systemic immune activation occurs, whereas in the segmental type, there is only a localized cytotoxic reaction, probably due to melanocyte mosaicism.<a class="elsevierStyleCrossRef" href="#bib0465">93</a> Tregs are unaffected in the peripheral blood of segmental vitiligo when compared to controls. On the other hand, Tregs are reduced in nonsegmental vitiligo and associated with other autoimmune comorbidities, less frequent in segmental vitiligo. Moreover, the antibody response against melanocyte-specific antigens occurs only in nonsegmental vitiligo.The higher frequency of autoimmune comorbidities in patients with nonsegmental vitiligo and also in their relatives reinforces the idea of vitiligo as a phenotypic representation of a systemic autoimmune imbalance. Comorbidities vary widely with the studied population and depend on sex, age, ethnicity, and vitiligo subtype. <a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a> lists the main autoimmune and autoinflammatory diseases described in vitiligo, with autoimmune thyroidites being the most frequent and well-established ones. Also noteworthy are ocular and auditory abnormalities due to the presence of melanocytes in the uvea and cochlea.<a class="elsevierStyleCrossRefs" href="#bib0015">3,94</a><elsevierMultimedia ident="tbl0010"></elsevierMultimedia>The development of vitiligo and halo nevus in patients with melanoma is a well-described phenomenon, probably due to auto aggression to melanocytes induced by tumor antigens. However, this occurs in 10% to 25% of patients treated with checkpoint inhibitors (e.g., nivolumab, pembrolizumab), a new class of medication for metastatic melanoma. These clinical lesions are indistinguishable from the common vitiligo, and the phenomenon is called leukoderma or vitiligo-like lesions; however, there is some doubt as to whether their origin is due to direct cytotoxicity to melanocytes or the development of autoimmunity (vitiligo) in predisposed patients.<a class="elsevierStyleCrossRef" href="#bib0475">95</a><a class="elsevierStyleCrossRef" href="#fig0025">Fig. 5</a> outlines the main changes in adaptive immunity involved in vitiligo.<elsevierMultimedia ident="fig0025"></elsevierMultimedia>The exact mechanism by which topical therapies with corticosteroids and calcineurin inhibitors affect the disease pathogenesis has yet to be fully elucidated, but it is believed that they reduce the lymphocytic infiltrate and TNFα expression. In trauma-induced injuries (Köbner), treatment with topical corticosteroids and tacrolimus reduced the underlying inflammatory infiltrate.<a class="elsevierStyleCrossRef" href="#bib0480">96</a>Phototherapy, in addition to stabilizing the redox balance, suppresses the inflammatory response, promoting T-cell apoptosis, decreasing inflammatory cytokines, increasing IL10 (with regulatory T-cell induction), reducing JAK1 expression, and depleting the Langerhans cells of the epidermis.<a class="elsevierStyleCrossRef" href="#bib0485">97</a>Vitiligo induced by chemical agentsChemical-associated vitiligo, also called leukoderma, has been described especially in rubber industry workers in contact with phenolic compounds. The first identified agent was hydroquinone monobenzyl ether (monobenzone), which induces cell death without activating the caspase cascade or DNA fragmentation.<a class="elsevierStyleCrossRef" href="#bib0490">98</a>Rhododendrol, another phenolic compound used in skin lightening treatments responsible for an outbreak of leukoderma in Japan, promotes cytotoxicity via a tyrosinase-dependent mechanism.<a class="elsevierStyleCrossRef" href="#bib0495">99</a>Hair dyes have also been implicated in the appearance of leukoderma, and one of the main suspects is paraphenylenediamine. However, the causal mechanism by which benzene derivatives cause depigmentation has yet to be elucidated.<a class="elsevierStyleCrossRef" href="#bib0500">100</a>Chemical leukoderma, however, does not share the autoimmunity changes (e.g., anti-TYRP1 antibody) as it occurs in vitiligo, despite promoting direct damage to melanocytes.<a class="elsevierStyleCrossRef" href="#bib0505">101</a>Neural theoryThe neural theory of vitiligo is based on the clinical observation of lesion distribution: on dermatomes in the segmental type and symmetrical in nonsegmental vitiligo, alluding to the neuroimmunological influence in vitiligo. There are also anecdotal cases of vitiligo appearing in delimited areas after nerve injury.<a class="elsevierStyleCrossRef" href="#bib0510">102</a> Finally, extreme psychological stress is a factor classically associated with the development of vitiligo and other autoimmune diseases; although the pathophysiological mechanism involved in this context is not fully elucidated, whether dependent on the change in the oxidative state, the modification of the immune tolerance system, or the participation of neurokinins.<a class="elsevierStyleCrossRef" href="#bib0515">103</a>In vitiligo, neuropeptide Y is increased in lesional skin and the perilesional area.<a class="elsevierStyleCrossRef" href="#bib0520">104</a> Substance P is increased in the skin of stable vitiligo when compared to unstable disease, suggesting that it is associated with vitiligo stability.<a class="elsevierStyleCrossRef" href="#bib0525">105</a>Extreme physical or psychological stress increases the synthesis of catecholamines and requires the activation of the hypothalamic-pituitary-adrenal axis, which interferes with the immune system regulation. In the acute stress phase, neutrophilia occurs, and there is an increase in NK cells in the plasma, in addition to proinflammatory cytokine imbalance, with an increase in IL6, resulting from the secretion of cortisol and catecholamines, modulating the immune response and the development of autoimmune and autoinflammatory diseases.<a class="elsevierStyleCrossRef" href="#bib0530">106</a>Emerging therapiesThe three emerging vitiligo therapeutic classes that are at the most advanced stage of development and are associated with the most important pathogenic pathways are the tyrosine kinase inhibitors (e.g., JAK1, JAK2, JAK3, TYK2), anti-IL15, and mutant HSP70.<a class="elsevierStyleCrossRefs" href="#bib0370">74,88,107</a><a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a> shows the emerging drugs according to their pathophysiological target.<elsevierMultimedia ident="tbl0015"></elsevierMultimedia>Conclusion and future researchThe understanding of the pathogenesis of vitiligo develops in parallel with the knowledge of the genetic regulation of the phenomena linked to OS and the cutaneous immune response.The epigenetic control of the gene expression linked to these phenomena can be an integrator of these processes since environmental and dietary factors, behavioral response patterns to stress, and the increasing exposure to industrialized compounds are intensely present in modern life, especially air pollution and aromatic compounds.<a class="elsevierStyleCrossRefs" href="#bib0540">108,109</a>The regulation of pathways related to transport vesicles (exosomes) between keratinocytes, melanocytes, and inflammatory cells constitutes another factor that should elucidate the interaction between the cell damage process, melanogenesis, and the immune response in vitiligo.<a class="elsevierStyleCrossRef" href="#bib0550">110</a>The role of intestinal dysbiosis in inflammation modulation, OS, and autoimmunity may disclose susceptibility profiles and the clinical expression of vitiligo, as increased intestinal permeability favors the activation of innate immunity and promotes systemic inflammatory stimulation.<a class="elsevierStyleCrossRef" href="#bib0555">111</a>Finally, the importance of hypovitaminosis D, a modern epidemic, in the immune response regulation, as well as the effect of its supplementation as an adjunct to treatment, must be explored since patients with vitiligo have lower levels of vitamin D.<a class="elsevierStyleCrossRef" href="#bib0560">112</a>In conclusion, the pathogenesis of vitiligo results from an interaction of elements (multifactorial), which suggests a genetic susceptibility basis, affected by environmental factors, oxidative stress, psychological factors, and patterns of autoimmune response. The integration of these theories is the main challenge in the construction of pathophysiological models.Financial supportNone declared.Authors’ contributionsHelena Zenedin Marchioro: Approval of the final version of the manuscript; drafting and editing of the manuscript; critical review of the literature; critical review of the manuscript.Caio César Silva de Castro: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; critical review of the literature; critical review of the manuscript.Vinicius Medeiros Fava: Approval of the final version of the manuscript; drafting and editing of the manuscript; critical review of the literature; critical review of the manuscript.Paula Hitomi Sakiyama: Approval of the final version of the manuscript; drafting and editing of the manuscript; critical review of the literature; critical review of the manuscript.Gerson Dellatorre: Approval of the final version of the manuscript; drafting and editing of the manuscript; critical review of the literature; critical review of the manuscript.Hélio Amante Miot: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; critical review of the literature; critical review of the manuscript.Conflicts of interestDr. Caio Castro: Advisory Board – Abbvie, Sun Pharma and Aché. Dr. Hélio Miot: Advisory Board – L’Oréal; Merz." "textoCompletoSecciones" => array:1 [ "secciones" => array:15 [ 0 => array:3 [ "identificador" => "xres1740645" "titulo" => "Abstract" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0005" ] ] ] 1 => array:2 [ "identificador" => "xpalclavsec1535179" "titulo" => "Keywords" ] 2 => array:2 [ "identificador" => "sec0005" "titulo" => "Introduction" ] 3 => array:3 [ "identificador" => "sec0010" "titulo" => "Vitiligo genetics" "secciones" => array:2 [ 0 => array:2 [ "identificador" => "sec0015" "titulo" => "Vitiligo susceptibility mapping by linkage analysis" ] 1 => array:2 [ "identificador" => "sec0020" "titulo" => "Genome-wide association study and vitiligo prediction" ] ] ] 4 => array:2 [ "identificador" => "sec0025" "titulo" => "Morphofunctional changes" ] 5 => array:2 [ "identificador" => "sec0030" "titulo" => "Oxidative changes" ] 6 => array:3 [ "identificador" => "sec0035" "titulo" => "Immunological changes" "secciones" => array:2 [ 0 => array:2 [ "identificador" => "sec0040" "titulo" => "Innate immunity" ] 1 => array:2 [ "identificador" => "sec0045" "titulo" => "Adaptive immunity" ] ] ] 7 => array:2 [ "identificador" => "sec0050" "titulo" => "Vitiligo induced by chemical agents" ] 8 => array:2 [ "identificador" => "sec0055" "titulo" => "Neural theory" ] 9 => array:2 [ "identificador" => "sec0060" "titulo" => "Emerging therapies" ] 10 => array:2 [ "identificador" => "sec0065" "titulo" => "Conclusion and future research" ] 11 => array:2 [ "identificador" => "sec0070" "titulo" => "Financial support" ] 12 => array:2 [ "identificador" => "sec0075" "titulo" => "Authors’ contributions" ] 13 => array:2 [ "identificador" => "sec0080" "titulo" => "Conflicts of interest" ] 14 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2021-08-16" "fechaAceptado" => "2021-09-21" "PalabrasClave" => array:1 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec1535179" "palabras" => array:4 [ 0 => "Autoimmunity" 1 => "Oxidative stress" 2 => "Pigmentation" 3 => "Vitiligo" ] ] ] ] "tieneResumen" => true "resumen" => array:1 [ "en" => array:2 [ "titulo" => "Abstract" "resumen" => "Vitiligo is a complex disease whose pathogenesis results from the interaction of genetic components, metabolic factors linked to cellular oxidative stress, melanocyte adhesion to the epithelium, and immunity (innate and adaptive), which culminate in aggression against melanocytes. In vitiligo, melanocytes are more sensitive to oxidative damage, leading to the increased expression of proinflammatory proteins such as HSP70. The lower expression of epithelial adhesion molecules, such as DDR1 and E-cadherin, facilitates damage to melanocytes and exposure of antigens that favor autoimmunity. Activation of the type 1-IFN pathway perpetuates the direct action of CD8+ cells against melanocytes, facilitated by regulatory T-cell dysfunction. The identification of several genes involved in these processes sets the stage for disease development and maintenance. However, the relationship of vitiligo with environmental factors, psychological stress, comorbidities, and the elements that define individual susceptibility to the disease are a challenge to the integration of theories related to its pathogenesis." ] ] "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "Study conducted at the Department of Dermatology, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, SP, Brazil." ] ] "multimedia" => array:8 [ 0 => array:8 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1281 "Ancho" => 1675 "Tamanyo" => 350821 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "Segmental vitiligo on the flank of a dark-skinned patient. Achromic macula, with zosteriform distribution; the periphery of the lesion shows a leukomelanoderma band, with several follicular repigmentation points – Source: authors’ file." ] ] 1 => array:8 [ "identificador" => "fig0010" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1230 "Ancho" => 1675 "Tamanyo" => 460746 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0010" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "Active vitiligo. Histopathology: perivascular lymphocytic infiltrate, with epidermal aggression and basal layer vacuolar degeneration foci (Hematoxylin &eosin, ×40). Picture is a courtesy of Dr. Lismary Mosque." ] ] 2 => array:8 [ "identificador" => "fig0015" "etiqueta" => "Figure 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 1978 "Ancho" => 1675 "Tamanyo" => 412352 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0015" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "Representation of Oxidative Stress (OS) and activation of innate immunity in vitiligo. The effects of ultraviolet radiation (UVR), phenolic compounds and trauma (Köbner) increase the production of reactive oxygen species (ROS). In parallel, genetic predisposition (such as mutations in the FOXO3A gene) lead to the inefficiency of antioxidant mechanisms, observed by an increase in the superoxide dismutase (SOD) enzyme, reduction in catalase (CAT) and glutathione (Glu), causing an imbalance in the redox status. OS also causes an accumulation of defective proteins in the endoplasmic reticulum, resulting in a phenomenon called the response to unfolded proteins (UPr), contributing to the process of autophagy leading to the production of proinflammatory interleukins (IL6 and IL8). The increased expression of TRPM2 (transient receptor potential cation channel subfamily M member 2), also induced by OS, promotes an influx of calcium into the melanocyte, culminating in its apoptosis. The OS promotes the release of DAMPs (damage-associated molecular patterns), especially HSP70, which initiate the innate response from the activation of dendritic cells (DC) and the participation of NK cells (natural killer) – Source: the authors." ] ] 3 => array:8 [ "identificador" => "fig0020" "etiqueta" => "Figure 4" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr4.jpeg" "Alto" => 1317 "Ancho" => 1675 "Tamanyo" => 264485 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0020" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "Representation of Interleukin (IL)-15 transpresentation in keratinocytes induced by oxidative stress (OS) and the interaction of interferon gamma (IFNγ) with the Janus kinase/signal transducers and transcription activators (JAK/STAT) pathway. The OS promotes the transpresentation of I-15 in keratinocytes through the binding of IL-15 to the heterodimeric IL-15 receptor (IL15R) on memory CD8 + T lymphocytes, consisting of CD122 and CD132, and to the I-15α receptor (IL15Rα) on keratinocytes (CD215). This process potentiates the activation of memory CD8 + T Cells and the production of inflammatory cytokines, such as IFNy, via JAK/STAT signaling (JAK1-STAT3 and JAK3-STAT5). The IFNγ/STAT1/CXCL10 axis conducts the autoimmune destruction of melanocytes. IFNγ signals through the IFNγ receptor (IFNγR) to stimulate JAK1/JAK2 and activate STAT1. The activation induces the production of CXCL9 and CXCL10, which signals through the CXCR3 receptor for the recruitment of more autoreactive CD8+ T cells – Source: the authors." ] ] 4 => array:8 [ "identificador" => "fig0025" "etiqueta" => "Figure 5" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr5.jpeg" "Alto" => 1171 "Ancho" => 1675 "Tamanyo" => 344332 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0025" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "Representation of alterations related to adaptive immunity in vitiligo. Melanocytes affected by oxidative stress (OS) trigger the activation of innate immunity through the secretion of exosomes, which contain damage-associated molecular patterns (DAMPs), especially heat shock protein 70 (HSP70). HSP70 stimulates the secretion of IFNα by dendritic cells in the initial phase of disease progression, which induces the production of chemokines CXCL9 and CXCL10 by keratinocytes and the recruitment of T-cells expressing the CXCR3 receptor. CXCL10 has an effector action, while CXCL9 acts on the global recruitment of autoreactive CD8+ T-cells. Effector CD8+ T-cells are responsible for the destruction of melanocytes through the production of interferon gamma (IFNγ), release of granzymes and perforins, facilitated by T- regulatory (Treg) cell dysfunction. CD8+ tissue-resident memory T cells (TRM) develop after the onset of the T-cell-mediated immune response and are implicated in disease maintenance, being retained in the tissue due to IL15 transpresentation by keratinocytes – Source: the authors." ] ] 5 => array:8 [ "identificador" => "tbl0005" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0030" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Gene \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Expression \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">NLRP1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">XBP1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">FOXD3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">PDGFRA \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">PTPN22 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">IKZF4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">FOXP3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">DDR1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">- \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Risk \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-A*02 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-Aw*31 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-A*32 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-A*33 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-A*09 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↓ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-Aw*19 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↓ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-DQB1*06 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-DQB1*0303 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-DR4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-DRB1*07 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HLA-DR7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">↑ \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Main genes and histocompatibility antigens (HLA) involved in the pathogenesis of vitiligo." ] ] 6 => array:8 [ "identificador" => "tbl0010" "etiqueta" => "Table 2" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0035" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Autoimmune or auto-inflammatory disease \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Alopecia areata \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Pernicious anemia \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rheumatoid arthritis \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Atopic dermatitis \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Dermatomyositis \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Type 1 Diabetes Mellitus \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Addison’s disease \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Crohn’s disease \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Graves’ disease \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Systemic scleroderma \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Multiple sclerosis \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Systemic lupus erythematosus \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Psoriasis \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Ulcerative colitis \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Sjogren’s Syndrome \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Hashimoto’s Thyroiditis \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Main autoimmune and auto-inflammatory diseases associated with vitiligo." ] ] 7 => array:8 [ "identificador" => "tbl0015" "etiqueta" => "Table 3" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0040" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:2 [ "leyenda" => "HSP70, heat shock protein 70; JAK, Janus kinase; SYK, spleen tyrosine kinase; TYK, tyrosine kinase; IFNy, interferon gama; IL, interleukin; mAb, monoclonal antibody." "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Class / Drug \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Therapeutic target/ Action mechanism \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Mutant HSP70 protein \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " rowspan="2" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Innate immunity inhibition ‒ reduced dendritic cell activation</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">HSP70iQ435A \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Tyrosine kinase inhibitors \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " rowspan="7" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Adaptive immunity ‒ alteration in cytokine/chemokine signaling (IFNy, CXCL10, IL15)</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Tofacitinibe (JAK1/3) \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Ruxolitinibe (JAK1/2) \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Cerdulatinib (SYK/JAK 1/2/3) \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">ATI-50002 (JAK1/3) \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">PF-06651600 (JAK3) \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">PF-06700841 (TYK2/JAK1) \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Anti-IL15 Biologicals \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " rowspan="3" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Adaptive immunity – blocking of IL15 signaling</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Anti-CD122 mAb \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">AMG 714 (Anti-IL15 mAb) \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Main emerging therapies and therapeutic targets in vitiligo." ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:112 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "The prevalence of vitiligo: a meta-analysis" "autores" => array:1 [ 0 => array:2 [ …2] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1371/journal.pone.0166947" "Revista" => array:4 [ "tituloSerie" => "PLoS One" "fecha" => "2016" "volumen" => "11" "link" => array:1 [ …1] ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib0010" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Prevalence of vitiligo in Brazil—a population survey" "autores" => array:1 [ 0 => array:2 [ …2] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1111/pcmr.12681" "Revista" => array:6 [ "tituloSerie" => "Pigment Cell Melanoma Res" "fecha" => "2018" "volumen" => "31" "paginaInicial" => "448" "paginaFinal" => "450" "link" => array:1 [ …1] ] ] ] ] ] ] 2 => array:3 [ "identificador" => "bib0015" "etiqueta" => "3" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "A pattern of association between clinical form of vitiligo and disease-related variables in a Brazilian population" "autores" => array:1 [ 0 => array:2 [ …2] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1016/j.jdermsci.2011.09.011" "Revista" => array:6 [ "tituloSerie" => "J Dermatol Sci" "fecha" => "2012" "volumen" => "65" "paginaInicial" => "63" "paginaFinal" => "67" "link" => array:1 [ …1] ] ] ] ] ] ] 3 => array:3 [ "identificador" => "bib0020" "etiqueta" => "4" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Quality of life impairment in children and adults with vitiligo: a cross-sectional study based on dermatology-specific and disease-specific quality of life instruments" "autores" => array:1 [ 0 => array:2 [ …2] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1159/000448656" "Revista" => array:6 [ "tituloSerie" => "Dermatology" "fecha" => "2016" "volumen" => "232" "paginaInicial" => "619" "paginaFinal" => "625" "link" => array:1 [ …1] ] ] ] ] ] ] 4 => array:3 [ "identificador" => "bib0025" "etiqueta" => "5" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Consensus on the treatment of vitiligo — Brazilian Society of Dermatology" "autores" => array:1 [ 0 => array:2 [ …2] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1016/j.abd.2020.05.007" "Revista" => array:6 [ "tituloSerie" => "An Bras Dermatol" "fecha" => "2020" "volumen" => "95" "paginaInicial" => "70" "paginaFinal" => "82" "link" => array:1 [ …1] ] ] ] ] ] ] 5 => array:3 [ "identificador" => "bib0030" "etiqueta" => "6" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Vitiligo: complex segregation and linkage disequilibrium analyses with respect to microsatellite loci spanning the HLA" "autores" => array:1 [ 0 => array:2 [ …2] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1007/s00439-002-0687-5" "Revista" => array:6 [ "tituloSerie" => "Hum Genet" "fecha" => "2002" "volumen" => "110" "paginaInicial" => "334" "paginaFinal" => "342" "link" => array:1 [ …1] ] ] ] ] ] ] 6 => array:3 [ "identificador" => "bib0035" "etiqueta" => "7" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Characteristics of genetic epidemiology and genetic models for vitiligo" "autores" => array:1 [ 0 => array:2 [ …2] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1016/j.jaad.2003.12.044" "Revista" => array:6 [ "tituloSerie" => "J Am Acad Dermatol" "fecha" => "2004" "volumen" => "51" "paginaInicial" => "383" "paginaFinal" => "390" "link" => array:1 [ …1] ] ] ] ] ] ] 7 => array:3 [ "identificador" => "bib0040" "etiqueta" => "8" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Novel vitiligo susceptibility loci on chromosomes 7 (AIS2) and 8 (AIS3), confirmation of SLEV1 on chromosome 17, and their roles in an 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Update on the pathogenesis of vitiligo

Helena Zenedin Marchioroa, Caio César Silva de Castrob, Vinicius Medeiros Favac, Paula Hitomi Sakiyamad, Gerson Dellatorrea, Hélio Amante Miote,

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helio.a.miot@unesp.br

Corresponding author.

a Medical Residency in Dermatology, Hospital Irmandade Santa Casa de Misericórdia de Curitiba, Curitiba, PR, Brazil

b Escola de Medicina, Pontifícia Universidade Católica do Paraná, Curitiba, PR, Brazil

c The Research Institute of the Mcgill University Health Centre, Montreal, QC, Canada

d Universidade Estadual do Oeste do Paraná, Cascavel, PR, Brazil

e Department of Dermatology, Faculty of Medicine, Universidade Estadual Paulista, Botucatu, SP, Brazil

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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Vitiligo is a chronic&#44; acquired dyschromia that promotes autoimmune aggression against melanocytes&#44; resulting in hypochromic or achromic macules and patches on the skin and mucous membranes&#44; with possible involvement of hair follicles&#44; in different extensions of the skin&#44; which may accompany systemic manifestations &#40;e&#46;g&#46;&#44; sensorineural deafness&#44; uveitis&#44; thyroiditis&#41;&#46; Its pathogenesis is multifactorial&#59; however&#44; the exact mechanisms that integrate the individual genetic susceptibility&#44; melanocyte auto aggression&#44; and failure of immune tolerance mechanisms are still not fully elucidated&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">The prevalence of vitiligo is quite variable around the world&#44; being more frequent in Africa &#40;0&#46;4&#37;&#41;&#44; Europe &#40;0&#46;4&#37;&#41;&#44; and Oceania &#40;1&#46;2&#37;&#41;&#44; than in North America &#40;0&#46;2&#37;&#41; and Asia &#40;0&#46;1&#37;&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> In Brazil&#44; its prevalence varies between 0&#46;46&#37;&#8211;0&#46;68&#37; of the population&#44; with no discrepancy between the sexes or racial groups&#46; The mean age of disease onset ranges from 20 to 30 years of age&#44; although it can affect children and the elderly&#46; Vitiligo still accounts for 1&#46;4&#37; to 1&#46;9&#37; of dermatological consultations and up to 3&#46;5&#37; of dermatological consultations in children&#46;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#44;3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Although it does not show specific skin symptoms or imply a serious health risk&#44; vitiligo patients are impacted in their quality of life since the disease is associated with a strong stigma that compromises social and professional relationships&#44; self-esteem&#44; and dress codes&#59; with women&#44; adolescents&#44; and patients with psychiatric disorders being the most affected groups&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">There is currently no definitive cure for vitiligo&#59; however&#44; several treatments have shown favorable results&#44; achieving some degree of repigmentation in over 80&#37; of cases&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> The recent advance in the understanding of its pathogenesis has promoted new therapeutic alternatives&#44; which allude to a more hopeful future for patients&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Vitiligo genetics</span><p id="par0025" class="elsevierStylePara elsevierViewall">Vitiligo is a complex disease in which the risk attributed to the genetic component is estimated at 75&#37; to 83&#37;&#44; whereas environmental factors would comprehend the remaining 20&#37;&#46; Studies of familial grouping&#44; studies in twins&#44; and segregation analyses characterize it as a multifactorial disease with a polygenic inheritance pattern&#46; Because of this&#44; the individual contribution of each genetic variant to susceptibility is relatively low&#46;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;7</span></a></p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Vitiligo susceptibility mapping by linkage analysis</span><p id="par0030" class="elsevierStylePara elsevierViewall">The mapping of genetic risk factors for vitiligo was performed by linkage analysis followed by positional cloning&#46; Linkage analysis assesses the nonrandom segregation of chromosomal regions among affected individuals in families with vitiligo&#46; Seven loci have been linked to vitiligo susceptibility&#44; of which four were observed in European populations and three in Chinese populations&#46; One locus on chromosome 17p13 was the first genomic region linked to vitiligo associated with autoimmune diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> And the positional cloning of the 17p13 region identified the <span class="elsevierStyleItalic">NLRP1</span> gene as the likely source of the vitiligo linkage signal&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#44;10</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">Chromosome 22q12 has been associated with the pathogenesis of vitiligo&#44;<a class="elsevierStyleCrossRefs" href="#bib0040"><span class="elsevierStyleSup">8&#44;11</span></a> with the variants that regulate <span class="elsevierStyleItalic">XBP1</span> gene expression being the risk factor indicated in the 22q12 region&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a><span class="elsevierStyleItalic">XBP1</span> is a transcription factor that regulates the expression of the HLA class II gene&#44; being involved in cellular response to stress and often associated with autoimmune diseases&#46; In Asian and South American individuals&#44; a link between the MHC region on chromosome 6p21 and vitiligo has been observed&#46;<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;11</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">HLA class I and II-related genes have been implicated in the pathogenesis of vitiligo&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">13&#44;14</span></a> Fine mapping of HLA by imputation identified amino acid alterations at residues 135 and 45&#8210;46 for HLA-DQB1 and HLA-B&#44; respectively&#44; as strong risk factors for vitiligo in the Chinese population&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> Moreover&#44; a promoter variant that increases HLA-A&#42;02&#58;01 expression has been associated with common vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">Three loci&#44; at 1p31&#46;3 &#8211; p32&#46;2&#44; 7q21&#46;11&#44; and 8p12&#44; have been linked to vitiligo susceptibility in Europeans and one in Asian populations at 4q13-q21&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">17&#8211;19</span></a> Of these&#44; FOXD3 has been suggested as the causal gene candidate for 1p31&#46;3 &#8211; p32&#46;2 and <span class="elsevierStyleItalic">PDGFRA</span> for 4q13-q21&#44; while no candidate gene has been suggested for the two remaining loci&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">In addition to these&#44; HLA-A&#42;33&#44; HLA-Aw&#42;31&#44; HLA-DR4&#44; HLA-DR7&#44; and HLA-DQB1&#42;0303&#44; among others&#44; have been identified as risk factors for vitiligo in different samples&#46;<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">20&#44;21</span></a> On the other hand&#44; there are studies that correlate HLA-A&#42;09 and HLA-Aw&#42;19 with a lower risk for the disease&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">In Brazil&#44; a study with patients from the southeast region demonstrated an association of HLA-A&#42;02 and HLA-DRB1&#42;07 with susceptibility to vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> HLA-A&#42;02 is also associated with risk in populations from China&#44; India&#44; Slovakia&#44; and Northern Germany&#46; Similarly&#44; HLA-DRB1&#42;07 has been identified in samples from China&#44; India&#44; Slovakia&#44; Italy&#44; Morocco&#44; Turkey&#44; and Oman&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Additionally&#44; in Brazil&#44; HLA-DQB1&#42;06 has been correlated with susceptibility to vitiligo &#40;common&#44; acrofacial and mixed&#41;&#44; while HLA-A&#42;32 has been correlated with the localized form &#40;focal and segmental&#41;&#46; However&#44; these findings differ from other descriptions in the literature&#44; suggesting that HLA-DQB1&#42;06 and HLA-A&#42;32 are specifically associated with the Brazilian population&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Genome-wide association study and vitiligo prediction</span><p id="par0065" class="elsevierStylePara elsevierViewall">GWAS &#40;Genome-Wide Association Study&#41; tests a dense set of variants located throughout the human genome for association with a phenotype of interest using both case controls and families&#46; To date&#44; five GWAS have been performed for vitiligo in European and Asian populations&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">22&#8211;26</span></a> Together&#44; they have identified more than 50 loci associated with risk of vitiligo&#46; Most of the loci identified by GWAS were detected in Europeans&#44; suggesting a specific ethnicity effect or differences in study design or power&#46; However&#44; seven of the non-MHC loci were associated with vitiligo in subjects of different ethnicities&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">The observation of risk effects in independent populations strengthens the global contribution of genes in the pathophysiology of vitiligo&#46; One of these seven multiethnic vitiligo risk factors includes the <span class="elsevierStyleItalic">PTPN22</span> gene&#44; which encodes a protein tyrosine phosphatase involved in T-cell signaling&#46; Interestingly&#44; <span class="elsevierStyleItalic">PTPN22</span> variants have been associated with several diseases related to the immune system&#44; including rheumatoid arthritis&#44; systemic lupus erythematosus&#44; and Crohn&#39;s disease&#44; which characterizes it as a pleiotropic gene for autoimmune diseases&#46;<a class="elsevierStyleCrossRefs" href="#bib0135"><span class="elsevierStyleSup">27&#44;28</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">The <span class="elsevierStyleItalic">IKZF4</span> gene&#44; associated with vitiligo in European and Chinese individuals&#44; exerts a FOXP3-mediated gene silencing on T regulatory cells &#40;Tregs&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> The <span class="elsevierStyleItalic">FOXP3</span> gene located on the X chromosome was also a risk factor for vitiligo in several ethnicities&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">Combined&#44; these associations highlight the key players in the contribution of T-cells to the pathogenesis of vitiligo&#46; Other candidate loci for vitiligo in several ethnicities include <span class="elsevierStyleItalic">FASLG</span>&#44; a member of the TNF superfamily&#44; and GZMB&#44; a protease&#44; both of which point to a role of dysregulated apoptosis in vitiligo&#46; Another significant non-HLA association with vitiligo found in Europeans was observed for the <span class="elsevierStyleItalic">TYR</span> gene&#44; which regulates melanin biosynthesis in melanocytes&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a></p><p id="par0085" class="elsevierStylePara elsevierViewall">The translational aspect of the GWAS findings goes beyond the description of the mechanisms associated with the disease pathogenesis&#46; The cumulative frequency of vitiligo risk alleles can be used to calculate the probability&#44; using a polygenic risk score&#44; that an individual will become a case&#46; Using autosomal risk variants of vitiligo described by GWAS&#44; the predictive power of the polygenic risk score was found to be 71&#37;&#44; which is among the highest values &#8203;&#8203;found for complex diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">Candidate gene approaches are conceptually based on a mechanistic hypothesis&#46; Autoimmunity&#44; melanocyte adhesion&#44; and metabolic dysfunction have been suggested as contributing to the etiology of vitiligo&#44; and several genes based on the above mechanisms have been tested&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a> Noteworthy examples include the DDR1 gene&#44; which encodes a transmembrane tyrosine kinase receptor that is the main adhesion protein of melanocytes to the basement membrane and has been shown to be downregulated in vitiligo in comparison to unaffected skin&#46;<a class="elsevierStyleCrossRefs" href="#bib0160"><span class="elsevierStyleSup">32&#44;33</span></a> DDR1 forms a complex with E-cadherin &#40;encoded by <span class="elsevierStyleItalic">CDH1</span>&#41;&#44; which is important for the maintenance of the epithelial structure&#46; Variants close to the <span class="elsevierStyleItalic">CDH1</span> gene have been associated with vitiligo in Brazilian individuals&#44; linking defects in melanocyte adhesion to the pathogenesis of vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> Melanocyte damage due to excessive oxidative stress is another well-established candidate mechanism for vitiligo&#46; The accumulation of reactive oxygen species in the epidermis can inhibit the BCHE enzymatic activity&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> Variants that control the enzymatic activity of the <span class="elsevierStyleItalic">BCHE</span> gene have been associated with vitiligo in independent samples of the Brazilian population&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a></p><p id="par0095" class="elsevierStylePara elsevierViewall">The main genetic changes linked to vitiligo are summarized in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Morphofunctional changes</span><p id="par0100" class="elsevierStylePara elsevierViewall">In addition to the significant reduction in melanin and melanocytes&#44; the skin with vitiligo shows morphological changes both in the epithelium and in the upper dermis&#44; which supports the hypothesis that other elements contribute to disease development&#44; in addition to melanocyte susceptibility to oxidative and immunological damage&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">Histopathologically&#44; less pigmentation in the basal layer is observed in up to 78&#37; of the epidermis with vitiligo&#44; and some inflammatory infiltrate is identified in up to 48&#37; of cases&#46; In vitiligo cases with active disease&#44; histopathology may show a lichenoid interface dermatitis pattern&#44; demonstrating the focus of self-aggression located in the basal layer&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> T-lymphocytes &#40;CD3&#43;&#41;&#44; especially the cytotoxic phenotypes &#40;CD8&#43;&#41;&#44; are the predominant cells &#40;65&#46;4&#37;&#41; in the infiltrate&#44; which is more evident in perilesional skin with perivascular and periannexal distribution&#46; For this reason&#44; perilesional skin is considered the area with the highest inflammatory activity in vitiligo &#40;<a class="elsevierStyleCrossRefs" href="#fig0005">Figs&#46; 1 and 2</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a></p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0110" class="elsevierStylePara elsevierViewall">Screening of melanin pigmentation using Fontana-Masson staining identified residual melanin in 16&#37; of vitiligo cases&#44; and in 12&#37; of cases&#44; melanocytes were identified in the lesions&#44; demonstrating that total destruction of melanocytes may not occur in the affected area&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a></p><p id="par0115" class="elsevierStylePara elsevierViewall">On electron microscopy&#44; abnormal melanogenesis was identified in active vitiligo&#59; melanocytes from the control skin and perilesional area of &#8203;&#8203;stable vitiligo lesions showed long&#44; thin dendrites with a moderate number of melanosomes&#44; in contrast to the melanocyte dendrites from the perilesional area of &#8203;&#8203;active vitiligo&#58; retractable with few melanosomes&#46;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">39</span></a> Langerhans cells are increased in the epidermis&#44; the basement membrane is thickened&#44; and degenerative alterations &#40;e&#46;g&#46;&#44; cytoplasmic vacuolization&#41; in basal melanocytes and keratinocytes are evidenced during disease activity&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">The role of the remaining melanocytes in the basal layer in the repigmentation process of vitiligo is still unclear&#44; especially because melanogenesis is compromised in the lesions&#46; However&#44; the maintenance of hair follicle pigmentation in an affected area indicates good prognosis since the migration of melanocytes from the outer follicular sheath can be evidenced by the identification of perifollicular repigmentation after phototherapy &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">The main source of repigmentation in vitiligo is the melanoblasts of the hair outer root sheath&#44; when not attacked by CD8&#43; T-cells&#46; After stimulation with phototherapy&#44; these melanoblasts migrate&#44; differentiate into melanocytes&#44; and proliferate into the epidermis&#44; probably through the upregulation of the stem cell-associated gene&#44; <span class="elsevierStyleItalic">GLI1</span>&#46;<a class="elsevierStyleCrossRef" href="#bib0200"><span class="elsevierStyleSup">40</span></a></p><p id="par0130" class="elsevierStylePara elsevierViewall">The stratum corneum and viable epidermis of vitiligo lesions are increased in thickness compared to non-lesional skin&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">41</span></a> The lesional epithelium also has larger corneocytes&#44; likely to compensate for the decreased expression of cornification components and&#44; therefore&#44; they result in a thicker stratum corneum in vitiligo lesions&#46; A possible explanation for this fact may be the reduced expression of D3 gangliosides&#44; which favors keratinocyte apoptosis in patients with vitiligo&#46; This potentially induces a compensatory mechanism of epidermal thickening to protect the affected skin against ultraviolet radiation &#40;UVR&#41;&#46;</p><p id="par0135" class="elsevierStylePara elsevierViewall">However&#44; previous optical and electron microscopy studies have demonstrated degenerative changes in keratinocytes in both affected and unaffected skin of patients with vitiligo&#44;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a> suggesting that the entire epithelium of patients with vitiligo is susceptible to and suffers from the pathogenic pressures of the disease&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">In common vitiligo&#44; there is a decrease in the epithelial cones of the dermal-epidermal junction&#46; Similarly&#44; a difference in architecture was identified in patients with segmental and nonsegmental types of vitiligo&#46; In the segmental type&#44; there is a notable increase in epithelial cones&#59; acanthosis is observed in the nonsegmental type when compared with the skin of controls without vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">Adhesion defects between cell components of the epidermis have also been implicated in the pathogenesis of vitiligo&#46; E-cadherin is a protein that assists in anchoring between keratinocytes&#44; and its low expression has been identified in melanocytes in vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">43</span></a> It was also demonstrated in the dermis&#44; p53-positive cells in non-lesional areas&#44; and this reactivity was higher in vitiligo lesions than in controls&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">The reduction of melanocytes in vitiligo was also related to a defect in cell adhesion but not directly to apoptosis&#46; Furthermore&#44; cytokines such as IFN&#947; and TNF&#945; induce melanocyte detachment and decrease the distribution of E-cadherin in melanocytes&#46; However&#44; the combination of the two cytokines was able to downregulate the expression of the <span class="elsevierStyleItalic">CDH1</span> gene that encodes E-cadherin and also reduced the expression of the genes associated with adhesion deficit&#44; <span class="elsevierStyleItalic">DDR1</span> and <span class="elsevierStyleItalic">CCN3</span>&#46; Furthermore&#44; MMP-9 is elevated in the skin and plasma of patients with common vitiligo&#44; being produced in keratinocytes by the stimulation of TNF&#945; and IFN&#947; and associated with E-cadherin cleavage&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">44</span></a></p><p id="par0155" class="elsevierStylePara elsevierViewall">The DKK1 protein&#44; which reduces melanogenesis and certain somatic functions of melanocytes&#44; is overexpressed by lesional fibroblasts in vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">45</span></a> Similarly&#44; there is a greater expression of fibronectin&#44; a key protein in intercellular communication by binding to integrins&#44; in the dermis of patients with vitiligo compared with healthy controls&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">43</span></a> Additionally&#44; elastin is reduced in lesional dermis&#44; but collagen fibers show no difference when compared to unaffected skin&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">46</span></a></p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Oxidative changes</span><p id="par0160" class="elsevierStylePara elsevierViewall">Cutaneous melanocytes&#44; located in the organ with the greatest interface with the external environment and&#44; consequently&#44; the most exposed to ultraviolet radiation and pollutants&#44; are particularly vulnerable to excessive production of reactive oxygen species &#40;ROS&#41;&#46; The concentration of these substances is even higher than in other adjacent cells&#44; such as keratinocytes and fibroblasts&#46; This is due&#44; in part&#44; to their specialized function of producing melanin &#40;which generates by-products such as O<span class="elsevierStyleInf">2</span><span class="elsevierStyleSup">&#8722;</span> and H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span>&#41; and inflammation due to excessive photo exposure&#46;<a class="elsevierStyleCrossRefs" href="#bib0235"><span class="elsevierStyleSup">47&#44;48</span></a></p><p id="par0165" class="elsevierStylePara elsevierViewall">In the hair follicle&#44; the outer sheath melanocytes are responsible for intense melanin synthesis&#46; There is evidence that the production of ROS in these melanocytes favors white hairs during the aging process&#44; which is also accompanied by loss of protective antioxidant mechanisms&#44; generating an alteration in the oxidative&#47;antioxidative balance &#40;redox status&#41;&#46; In an <span class="elsevierStyleItalic">in vitro</span> model of oxidative stress&#44; glutamine &#40;a precursor amino acid of the antioxidant molecule glutathione&#41; was shown to be able to reduce melanocyte apoptosis&#46; In addition to triggering apoptosis&#44; ROS also has the potential to reduce melanogenesis&#44; as demonstrated by <span class="elsevierStyleItalic">in vitro</span> tests following exposure of melanocytes to H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span>&#46;<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">48&#8211;51</span></a></p><p id="par0170" class="elsevierStylePara elsevierViewall">The theory of vitiligo development due to oxidative stress &#40;OS&#41; suggests that ROS production would be induced by multiple intrinsic factors &#40;such as inflammation and protein synthesis&#41;&#44; as well as extrinsic ones&#44; such as exposure to ultraviolet radiation pollutants&#44; and phenolic compounds&#46; In parallel&#44; a failure in the antioxidant mechanism would occur&#44; disrupting cell homeostasis and culminating in cell damage&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">52</span></a></p><p id="par0175" class="elsevierStylePara elsevierViewall">Melanocytes cultured from unaffected areas in patients with vitiligo have a greater susceptibility to oxidative stress than from controls without vitiligo&#44; demonstrating an overall susceptibility of the patient with vitiligo to oxidative damage&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">53</span></a></p><p id="par0180" class="elsevierStylePara elsevierViewall">There is an increase in the superoxide dismutase enzyme &#40;responsible for degrading the O<span class="elsevierStyleInf">2</span><span class="elsevierStyleSup">&#8722;</span> radical into H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span> and O<span class="elsevierStyleInf">2</span>&#41;&#44; an increase in lipid peroxidation &#40;secondary to OS&#41;&#44; in addition to a reduction in the catalase enzyme &#40;which converts H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span> into H<span class="elsevierStyleInf">2</span>O and O<span class="elsevierStyleInf">2</span>&#41; in vitiligo&#46; However&#44; when compared to other inflammatory diseases such as psoriasis and lichen planus&#44; such alterations are also reported&#44; suggesting that the OS pathway is not disease-specific&#46; In contrast&#44; when non-lesional skin is assessed&#44; there are more oxidative pathway alterations in the skin of patients with vitiligo than of patients with other inflammatory skin diseases&#44; suggesting that the depigmented areas are a phenotypically altered part of skin subjected to oxi-reducing imbalance&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">54</span></a></p><p id="par0185" class="elsevierStylePara elsevierViewall">In addition to having a lower systemic antioxidant capacity &#40;glutathione peroxidase reduction&#41; when compared to individuals without vitiligo&#44;<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">55</span></a> there are differences in the serum levels of superoxide dismutase &#40;SOD&#41; and reduced glutathione &#40;GSH&#41; between patients with common and localized vitiligo&#44; also assuming a difference in the systemic antioxidant status according to disease severity&#46;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">56</span></a> Polymorphisms of <span class="elsevierStyleItalic">FOXO3A</span>&#44; a gene with an important role in OS regulation&#44; are also found in patients with active vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">57</span></a></p><p id="par0190" class="elsevierStylePara elsevierViewall">Treatment with narrowband UVB&#44; in turn&#44; is able to balance the redox status in patients with vitiligo&#44; as demonstrated by the significant reduction in serum malondialdehyde &#40;MDA&#41; levels and an increase in glutathione peroxidase in patients treated by this phototherapy method&#46;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">58</span></a></p><p id="par0195" class="elsevierStylePara elsevierViewall">It is hypothesized that OS inflicts cell damage by inducing apoptosis in melanocytes&#44; as well as other cell death mechanisms&#44; such as ferroptosis and phagoptosis&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">52</span></a> Clinical and biochemical studies suggest that the overexpression of the <span class="elsevierStyleItalic">TRPM2</span> gene &#40;transient receptor potential cation channel subfamily M member 2&#41; and the CGRP &#40;calcitonin gene-related peptide&#41; peptide are related to OS-sensitive calcium channels in perilesional melanocytes in vitiligo&#46; In these cases&#44; H<span class="elsevierStyleInf">2</span>O<span class="elsevierStyleInf">2</span> would induce the demethylation of the promoter region of the <span class="elsevierStyleItalic">TRPM2</span> gene and increase its expression in melanocytes&#44; promoting the calcium influx into the cytoplasm&#44; and promoting its apoptosis&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a></p><p id="par0200" class="elsevierStylePara elsevierViewall">In a study with murine melanocytes&#44; the natural process of autophagy&#44; in which cells degrade their organelles and damaged proteins to maintain their homeostasis&#44; was also shown to be impaired when excessive ROS accumulation occurs&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> In vitiligo&#44; melanocytes and fibroblasts are more sensitive to OS-induced autophagy&#44; which reduces their potential to control melanogenesis&#46;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">61</span></a></p><p id="par0205" class="elsevierStylePara elsevierViewall">OS can also trigger changes in the melanocyte endoplasmic reticulum&#44; culminating in the accumulation of defective proteins&#44; stimulating a cell stress phenomenon called &#8220;unfolded protein response&#8221; &#40;UPR&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">62</span></a> Moreover&#44; energy requirements for protein production &#40;such as melanin&#41; alone generate ROS through mitochondrial metabolism&#46; These two pathways seem to be overactivated in the melanocytes of patients with vitiligo&#44; suggesting that these cells tolerate less the demand for melanin production than those of healthy individuals&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">63</span></a> Even healthy melanocytes undergo cell stress when exposed to certain phenolic compounds such as hydroquinone monobenzyl ether&#44; inducing the production of IL6 and IL8&#46;<a class="elsevierStyleCrossRefs" href="#bib0315"><span class="elsevierStyleSup">63&#44;64</span></a></p><p id="par0210" class="elsevierStylePara elsevierViewall">Despite the extensive use of antioxidants by patients with vitiligo who seek therapeutic alternatives&#44; the role of this pathogenic mechanism and the application of this knowledge in clinical practice remain controversial&#46; The lack of a consistent response to systemic antioxidants suggests that OS may not play a central role in disease pathogenesis&#44; which raises the need for studies to identify the real role of the mechanism in this complex disease&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">54</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a> summarizes the possible pathways of damage to melanocytes due to OS in vitiligo&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0220" class="elsevierStylePara elsevierViewall">In vitiligo&#44; OS also participates in the K&#246;bner phenomenon&#44; although its etiology is probably multifactorial&#46; After epithelial trauma&#44; inflammatory mediators lead to an increase in OS&#44; inducing cell death&#44; a process that is also favored by melanocyte adhesion defects&#46; Additionally&#44; epithelial trauma promotes the release of IFN&#945;&#44; which increases the expression of CXCL10&#44; favoring the migration of circulating lymphocytes&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">65</span></a></p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Immunological changes</span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Innate immunity</span><p id="par0225" class="elsevierStylePara elsevierViewall">Evidence for the participation of the innate immune system in the pathogenesis of vitiligo is very consistent&#44; with the latter being considered the link between oxidative stress and the adaptive immune response&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a> First&#44; dendritic cells&#44; macrophages&#44; and NK &#40;natural killer&#41; cells are found in the lesional and perilesional skin of patients with vitiligo&#44; characterizing an activation of the innate immune response&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">67</span></a></p><p id="par0230" class="elsevierStylePara elsevierViewall">Activated NK cells &#40;CD56&#43; &#47; granzyme B&#43;&#41; and IFN&#947;-producing cells have been identified in the blood and non-lesional skin of patients with vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0340"><span class="elsevierStyleSup">68</span></a> Moreover&#44; there is an increase in proinflammatory cytokines&#44; characteristic of innate immunity&#44; in both serum and skin of patients with vitiligo&#44; such as IL1&#945;&#44; IL1&#946;&#44; IL6&#44; IL8&#44; IL12&#44; IL15&#44; and TNF&#945;&#46;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">69</span></a> These elements indicate a global activation of the body innate immunity&#44; transcending the affected areas&#46;</p><p id="par0235" class="elsevierStylePara elsevierViewall">The oxidative stress that occurs in the melanocyte&#44; as mentioned before&#44; is possibly the autoimmunity trigger in vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">63</span></a> The communication between the melanocyte and the innate immune system seems to occur through the secretion of exosomes&#44; which contain melanocyte-specific antigens&#44; miRNAs&#44; heat shock proteins&#44; and DAMPs &#40;damage-associated molecular patterns&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">64</span></a> These exosomes deliver autoantigens to dendritic cells&#44; which undergo maturation into antigen-presenting cells&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">70</span></a></p><p id="par0240" class="elsevierStylePara elsevierViewall">The DAMP with the highest evidence of association with vitiligo to date is HSP70 &#40;heat shock protein 70&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a> HSP70 is a protein from the intracellular chaperone family whose function is to prevent the incorrect folding of other proteins and their aggregation&#46; Whereas some HSPs facilitate the folding of newly formed proteins&#44; others are particularly induced during physiological stress to manage the extra burden of stress-induced protein misfolding&#44; thus preserving cell viability&#46;<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">71</span></a> Although HSPs are intracellular proteins&#44; it has been observed that&#44; under stress situations&#44; they can be secreted by the cell&#46; In the extracellular environment&#44; the identification of these proteins by cells of the immune system results in signal transduction that leads to the release of proinflammatory cytokines&#44; such as IFN&#945;&#46; <span class="elsevierStyleItalic">In vitro</span> studies have demonstrated the expression of HSP70 Lox-1 receptors on the surface of dendritic cells in vitiligo&#46; The same study showed that HSP70 induces the maturation and activation of dendritic cells &#40;CD80&#43;&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0355"><span class="elsevierStyleSup">71&#44;72</span></a></p><p id="par0245" class="elsevierStylePara elsevierViewall">The induced HSP70 is present in lesional and perilesional skin in vitiligo&#46; Studies in animal models have demonstrated the relationship between induced HSP70 and the recruitment and activation of inflammatory dendritic cells in vitiligo&#46; Furthermore&#44; in rats&#44; HSP70 has been shown not only to be necessary but sufficient to accelerate skin depigmentation&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> Finally&#44; a study that introduced a mutant HSP70&#44; in which only one amino acid was altered in its structure&#44; showed that it was able to promote skin repigmentation by binding to dendritic cells and inactivating them and&#44; consequently&#44; inhibiting the subsequent T-cell response&#46; This HSP70 molecule with an amino acid change is considered a potential treatment for vitiligo and is expected to be studied in clinical trials&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">74</span></a></p><p id="par0250" class="elsevierStylePara elsevierViewall">NLRP-1 &#40;nuclear localization leucine-rich-repeat protein 1&#41; is another component of innate immunity identified in vitiligo&#46; Variants of the DNA sequence in the NALP1 region are associated with the risk for several epidemiologically associated autoimmune and autoinflammatory diseases&#44; including common vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> NLRP-1 is a key regulator of the innate immune response&#46; By recognizing the DAMPs&#44; this receptor activates the inflammasome&#44; which&#44; through the caspase-1 pathway&#44; induces the processing of pro-IL1&#946; into active IL1&#946;&#44; as well as its secretion into the extracellular environment&#44; where it perpetuates the inflammatory response&#46;<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">75</span></a> IL1&#946; plays a key role in the polarization of T cells towards Th17&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">76</span></a> The perilesional skin of vitiligo&#44; where the disease is most active&#44; shows an increase in IL1&#946;&#44; suggesting that this pathway is also involved in vitiligo progression&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">77</span></a> Therefore&#44; IL1&#946; inhibition can also be seen as a potential therapeutic target in vitiligo&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Adaptive immunity</span><p id="par0255" class="elsevierStylePara elsevierViewall">The activation of innate immunity triggered by damage to melanocytes affected by oxidative stress promotes cytokine secretion and antigen presentation&#44; resulting in the adaptive immune system activation&#44; in which autoreactive T-cells amplify damage to melanocytes in vitiligo-affected skin&#46;</p><p id="par0260" class="elsevierStylePara elsevierViewall">In this context&#44; cytotoxic T-lymphocytes &#40;CD8&#43;&#41; are the main cells implicated in disease pathogenesis&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">78</span></a> However&#44; although antibodies reactive against melanocytes &#40;e&#46;g&#46;&#44; anti-MelanA&#44; anti-MCHR1&#44; anti-tyrosinase&#44; anti-gp100&#44; and anti-tyrosine hydroxylase&#41; have elevated serum titers in patients with vitiligo&#44; they do not correlate with disease activity&#46;<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">79</span></a> Nevertheless&#44; the literature is controversial&#44; and the exact role of anti-melanocyte antibodies in vitiligo remains unclear&#46;</p><p id="par0265" class="elsevierStylePara elsevierViewall">The type I IFN pathway is a key point for the start of the vitiligo immune response&#46; The IFN-I signature characterizes an early and transient event in its progression and a link between the innate and adaptive immune response&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">65</span></a> Studies have shown that IFN&#945;&#44; produced mainly by plasmacytoid dendritic cells &#40;pDCs&#41;&#44; stimulates the production of chemokines&#44; such as CXCL9 and CXCL10&#44; by keratinocytes&#44; leading to the recruitment of T-cells expressing their receptor&#58; CXCR3&#46;<a class="elsevierStyleCrossRefs" href="#bib0325"><span class="elsevierStyleSup">65&#44;72</span></a> Furthermore&#44; HSP70 potentially contributes to skin inflammation by activating pDCs and increasing IFN&#945; secretion&#46;<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">72</span></a></p><p id="par0270" class="elsevierStylePara elsevierViewall">Cytotoxic CD8&#43; T-cells are necessary and sufficient for the destruction of melanocytes&#44; acting as an effector arm of autoimmunity&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">78</span></a> The lesions are caused by effector CD8&#43; T-lymphocytes in the initial or active phase of the disease and by recirculating and resident memory CD8&#8239;&#43;&#8239;T &#40;TEM&#41; lymphocytes in the stable phase&#46; The mechanism of aggression is based on the production of inflammatory cytokines such as TNF&#945; and IFN&#947;&#44; in addition to the release of granzymes and perforins&#44; which cause direct damage to melanocytes&#46;<a class="elsevierStyleCrossRefs" href="#bib0390"><span class="elsevierStyleSup">78&#44;80</span></a> In the lymphocytic infiltrate of the periphery of the depigmented areas&#44; CD8&#43; T-lymphocytes predominate&#44; and this finding correlates with disease activity&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">81</span></a></p><p id="par0275" class="elsevierStylePara elsevierViewall">Melanocyte-specific antigens recognized by CD8&#43; T-cells&#44; such as MelanA&#44; tyrosinase&#44; gp100&#44; and tyrosinase-related proteins 1 and 2&#44; are detected in greater numbers in the peripheral blood of patients with vitiligo when compared to controls&#46;<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">82</span></a> The perilesional skin also expresses higher levels of CD8&#43; T lymphocytes against melanocyte antigens in comparison to normal skin&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">78</span></a> These autoreactive cells are able to destroy melanocytes <span class="elsevierStyleItalic">in vitro</span><a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">81</span></a> in addition to inducing apoptosis of keratinocytes and melanocytes in a pattern similar to the disease&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">78</span></a></p><p id="par0280" class="elsevierStylePara elsevierViewall">IFN&#947;&#44; and the genes it induces&#44; encode the CXCR3 chemokine receptor and its ligands CXCL9 and CXCL10&#44; which are critical for the activation of CD8&#43; T cells&#44; and are found to be increased in the skin and blood of patients with vitiligo&#46;<a class="elsevierStyleCrossRefs" href="#bib0415"><span class="elsevierStyleSup">83&#44;84</span></a> CXCL9 promotes the global recruitment of autoreactive T-cells but with no effector action&#44; whereas CXCL10 is required for disease progression and maintenance&#46;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">85</span></a> Moreover&#44; the neutralization of CXCL10 in animal models prevents the appearance of new lesions and induces the repigmentation of established areas&#44;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">85</span></a> identifying the therapeutic potential of IFN&#947;&#47;CXCL10&#47;CXCR3 axis inhibition&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">86</span></a> Keratinocytes are the main sources of these cytokines&#44; and CXCL9 and CXCL10 measurements are potential biomarkers of disease activity&#46;<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">84</span></a></p><p id="par0285" class="elsevierStylePara elsevierViewall">The Janus kinase&#47;signal transducers and transcription activators &#40;JAK&#47;STAT&#41; pathway participate in the immunopathogenesis of vitiligo through its interaction with IFN&#947;&#46; IFN&#947;&#47;CXCL10 signaling starts with the binding of IFN&#947; to its heterodimeric receptor&#44; which stimulates the JAK&#47;STAT pathway and leads to STAT1 activation&#46; Subsequently&#44; STAT1 translocation to the nucleus and subsequent binding to the IFN&#947;-induced gene promoter region such as CXCL10 occur&#46; There are four members of the JAK protein family&#44; including JAK1&#44; JAK2&#44; JAK3&#44; and tyrosine kinase 2 &#40;TYK2&#41;&#46; JAK1 and JAK2 are directly involved in IFN&#947; signaling&#46; In this context&#44; some studies have used several JAK inhibitors as a repigmentation strategy&#46;<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">87</span></a></p><p id="par0290" class="elsevierStylePara elsevierViewall">Vitiligo recurrence is a common phenomenon&#44; often occurring in the same affected site prior to treatment&#46; This pattern of recurrence suggests the role of autoimmune memory in the maintenance of the condition&#44; characterized by the presence of memory CD8&#8239;&#43;&#8239;T Cells in both the epidermis and dermis&#44; which act as sentinels for the recruitment of T-effector memory cells from the circulation&#46;<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">80</span></a> TRMs are long-lived lymphocytes that develop after the start of a T-cell-mediated immune response&#46;</p><p id="par0295" class="elsevierStylePara elsevierViewall">Based on the demonstration that TRMs require IL15 for their differentiation&#44; the interruption of the IL15 pathway using an anti-CD122 antibody caused reversal of depigmentation in mice with stable vitiligo&#46; In that trial&#44; short-term treatment with anti-CD122 inhibited IFN-&#947; production by TRMs&#44; and long-term use depleted these cells from the lesions&#46;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">88</span></a> Additional IL15 functions have also been mapped in other studies&#46; One study showed that IL15 causes the expression of NKG<span class="elsevierStyleInf">2</span>D in memory CD8&#8239;&#43;&#8239;T Cells in skin with vitiligo&#44; triggering the production of IFN&#947; and TNF&#945;&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">89</span></a> Additionally&#44; oxidative stress has been shown to induce IL15 transpresentation in keratinocytes&#44; contributing to the activation of memory CD8&#8239;&#43;&#8239;T Cells through the activation of the JAK&#47;STAT pathway &#40;JAK1-STAT3 and JAK3-STAT5&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">90</span></a> Thus&#44; blocking IL15 signaling seems to be promising in the search for new treatments&#46;</p><p id="par0300" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a> details the IL15 transpresentation in keratinocytes induced by oxidative stress and the interaction of IFN&#947; with the JAK&#47;STAT pathway&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0305" class="elsevierStylePara elsevierViewall">CD4&#43; T-regulatory cells &#40;Tregs&#41; act to maintain tolerance to their own tissues by suppressing the activity of T-effector cells&#46; In vitiligo&#44; there is a Treg dysfunction&#44; although it is not known exactly whether due to the inability to migrate to the skin&#44; decreased numbers&#44; or activity suppression&#46;<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">91</span></a> In animal models of vitiligo&#44; there is control of disease progression and repigmentation of lesions with the re-establishment of the Treg population&#46;<a class="elsevierStyleCrossRef" href="#bib0460"><span class="elsevierStyleSup">92</span></a></p><p id="par0310" class="elsevierStylePara elsevierViewall">Alterations of the adaptive immune system are demonstrated in both segmental and nonsegmental vitiligo&#44; despite different reactivity patterns&#46; In nonsegmental vitiligo&#44; systemic immune activation occurs&#44; whereas in the segmental type&#44; there is only a localized cytotoxic reaction&#44; probably due to melanocyte mosaicism&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">93</span></a> Tregs are unaffected in the peripheral blood of segmental vitiligo when compared to controls&#46; On the other hand&#44; Tregs are reduced in nonsegmental vitiligo and associated with other autoimmune comorbidities&#44; less frequent in segmental vitiligo&#46; Moreover&#44; the antibody response against melanocyte-specific antigens occurs only in nonsegmental vitiligo&#46;</p><p id="par0315" class="elsevierStylePara elsevierViewall">The higher frequency of autoimmune comorbidities in patients with nonsegmental vitiligo and also in their relatives reinforces the idea of &#8203;&#8203;vitiligo as a phenotypic representation of a systemic autoimmune imbalance&#46; Comorbidities vary widely with the studied population and depend on sex&#44; age&#44; ethnicity&#44; and vitiligo subtype&#46; <a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a> lists the main autoimmune and autoinflammatory diseases described in vitiligo&#44; with autoimmune thyroidites being the most frequent and well-established ones&#46; Also noteworthy are ocular and auditory abnormalities due to the presence of melanocytes in the uvea and cochlea&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;94</span></a></p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0320" class="elsevierStylePara elsevierViewall">The development of vitiligo and halo nevus in patients with melanoma is a well-described phenomenon&#44; probably due to auto aggression to melanocytes induced by tumor antigens&#46; However&#44; this occurs in 10&#37; to 25&#37; of patients treated with checkpoint inhibitors &#40;e&#46;g&#46;&#44; nivolumab&#44; pembrolizumab&#41;&#44; a new class of medication for metastatic melanoma&#46; These clinical lesions are indistinguishable from the common vitiligo&#44; and the phenomenon is called leukoderma or vitiligo-like lesions&#59; however&#44; there is some doubt as to whether their origin is due to direct cytotoxicity to melanocytes or the development of autoimmunity &#40;vitiligo&#41; in predisposed patients&#46;<a class="elsevierStyleCrossRef" href="#bib0475"><span class="elsevierStyleSup">95</span></a></p><p id="par0325" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0025">Fig&#46; 5</a> outlines the main changes in adaptive immunity involved in vitiligo&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia><p id="par0330" class="elsevierStylePara elsevierViewall">The exact mechanism by which topical therapies with corticosteroids and calcineurin inhibitors affect the disease pathogenesis has yet to be fully elucidated&#44; but it is believed that they reduce the lymphocytic infiltrate and TNF&#945; expression&#46; In trauma-induced injuries &#40;K&#246;bner&#41;&#44; treatment with topical corticosteroids and tacrolimus reduced the underlying inflammatory infiltrate&#46;<a class="elsevierStyleCrossRef" href="#bib0480"><span class="elsevierStyleSup">96</span></a></p><p id="par0335" class="elsevierStylePara elsevierViewall">Phototherapy&#44; in addition to stabilizing the redox balance&#44; suppresses the inflammatory response&#44; promoting T-cell apoptosis&#44; decreasing inflammatory cytokines&#44; increasing IL10 &#40;with regulatory T-cell induction&#41;&#44; reducing JAK1 expression&#44; and depleting the Langerhans cells of the epidermis&#46;<a class="elsevierStyleCrossRef" href="#bib0485"><span class="elsevierStyleSup">97</span></a></p></span></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Vitiligo induced by chemical agents</span><p id="par0340" class="elsevierStylePara elsevierViewall">Chemical-associated vitiligo&#44; also called leukoderma&#44; has been described especially in rubber industry workers in contact with phenolic compounds&#46; The first identified agent was hydroquinone monobenzyl ether &#40;monobenzone&#41;&#44; which induces cell death without activating the caspase cascade or DNA fragmentation&#46;<a class="elsevierStyleCrossRef" href="#bib0490"><span class="elsevierStyleSup">98</span></a></p><p id="par0345" class="elsevierStylePara elsevierViewall">Rhododendrol&#44; another phenolic compound used in skin lightening treatments responsible for an outbreak of leukoderma in Japan&#44; promotes cytotoxicity via a tyrosinase-dependent mechanism&#46;<a class="elsevierStyleCrossRef" href="#bib0495"><span class="elsevierStyleSup">99</span></a></p><p id="par0350" class="elsevierStylePara elsevierViewall">Hair dyes have also been implicated in the appearance of leukoderma&#44; and one of the main suspects is paraphenylenediamine&#46; However&#44; the causal mechanism by which benzene derivatives cause depigmentation has yet to be elucidated&#46;<a class="elsevierStyleCrossRef" href="#bib0500"><span class="elsevierStyleSup">100</span></a></p><p id="par0355" class="elsevierStylePara elsevierViewall">Chemical leukoderma&#44; however&#44; does not share the autoimmunity changes &#40;e&#46;g&#46;&#44; anti-TYRP1 antibody&#41; as it occurs in vitiligo&#44; despite promoting direct damage to melanocytes&#46;<a class="elsevierStyleCrossRef" href="#bib0505"><span class="elsevierStyleSup">101</span></a></p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Neural theory</span><p id="par0360" class="elsevierStylePara elsevierViewall">The neural theory of vitiligo is based on the clinical observation of lesion distribution&#58; on dermatomes in the segmental type and symmetrical in nonsegmental vitiligo&#44; alluding to the neuroimmunological influence in vitiligo&#46; There are also anecdotal cases of vitiligo appearing in delimited areas after nerve injury&#46;<a class="elsevierStyleCrossRef" href="#bib0510"><span class="elsevierStyleSup">102</span></a> Finally&#44; extreme psychological stress is a factor classically associated with the development of vitiligo and other autoimmune diseases&#59; although the pathophysiological mechanism involved in this context is not fully elucidated&#44; whether dependent on the change in the oxidative state&#44; the modification of the immune tolerance system&#44; or the participation of neurokinins&#46;<a class="elsevierStyleCrossRef" href="#bib0515"><span class="elsevierStyleSup">103</span></a></p><p id="par0365" class="elsevierStylePara elsevierViewall">In vitiligo&#44; neuropeptide Y is increased in lesional skin and the perilesional area&#46;<a class="elsevierStyleCrossRef" href="#bib0520"><span class="elsevierStyleSup">104</span></a> Substance P is increased in the skin of stable vitiligo when compared to unstable disease&#44; suggesting that it is associated with vitiligo stability&#46;<a class="elsevierStyleCrossRef" href="#bib0525"><span class="elsevierStyleSup">105</span></a></p><p id="par0370" class="elsevierStylePara elsevierViewall">Extreme physical or psychological stress increases the synthesis of catecholamines and requires the activation of the hypothalamic-pituitary-adrenal axis&#44; which interferes with the immune system regulation&#46; In the acute stress phase&#44; neutrophilia occurs&#44; and there is an increase in NK cells in the plasma&#44; in addition to proinflammatory cytokine imbalance&#44; with an increase in IL6&#44; resulting from the secretion of cortisol and catecholamines&#44; modulating the immune response and the development of autoimmune and autoinflammatory diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0530"><span class="elsevierStyleSup">106</span></a></p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Emerging therapies</span><p id="par0375" class="elsevierStylePara elsevierViewall">The three emerging vitiligo therapeutic classes that are at the most advanced stage of development and are associated with the most important pathogenic pathways are the tyrosine kinase inhibitors &#40;e&#46;g&#46;&#44; JAK1&#44; JAK2&#44; JAK3&#44; TYK2&#41;&#44; anti-IL15&#44; and mutant HSP70&#46;<a class="elsevierStyleCrossRefs" href="#bib0370"><span class="elsevierStyleSup">74&#44;88&#44;107</span></a><a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a> shows the emerging drugs according to their pathophysiological target&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Conclusion and future research</span><p id="par0380" class="elsevierStylePara elsevierViewall">The understanding of the pathogenesis of vitiligo develops in parallel with the knowledge of the genetic regulation of the phenomena linked to OS and the cutaneous immune response&#46;</p><p id="par0385" class="elsevierStylePara elsevierViewall">The epigenetic control of the gene expression linked to these phenomena can be an integrator of these processes since environmental and dietary factors&#44; behavioral response patterns to stress&#44; and the increasing exposure to industrialized compounds are intensely present in modern life&#44; especially air pollution and aromatic compounds&#46;<a class="elsevierStyleCrossRefs" href="#bib0540"><span class="elsevierStyleSup">108&#44;109</span></a></p><p id="par0390" class="elsevierStylePara elsevierViewall">The regulation of pathways related to transport vesicles &#40;exosomes&#41; between keratinocytes&#44; melanocytes&#44; and inflammatory cells constitutes another factor that should elucidate the interaction between the cell damage process&#44; melanogenesis&#44; and the immune response in vitiligo&#46;<a class="elsevierStyleCrossRef" href="#bib0550"><span class="elsevierStyleSup">110</span></a></p><p id="par0395" class="elsevierStylePara elsevierViewall">The role of intestinal dysbiosis in inflammation modulation&#44; OS&#44; and autoimmunity may disclose susceptibility profiles and the clinical expression of vitiligo&#44; as increased intestinal permeability favors the activation of innate immunity and promotes systemic inflammatory stimulation&#46;<a class="elsevierStyleCrossRef" href="#bib0555"><span class="elsevierStyleSup">111</span></a></p><p id="par0400" class="elsevierStylePara elsevierViewall">Finally&#44; the importance of hypovitaminosis D&#44; a modern epidemic&#44; in the immune response regulation&#44; as well as the effect of its supplementation as an adjunct to treatment&#44; must be explored since patients with vitiligo have lower levels of vitamin D&#46;<a class="elsevierStyleCrossRef" href="#bib0560"><span class="elsevierStyleSup">112</span></a></p><p id="par0405" class="elsevierStylePara elsevierViewall">In conclusion&#44; the pathogenesis of vitiligo results from an interaction of elements &#40;multifactorial&#41;&#44; which suggests a genetic susceptibility basis&#44; affected by environmental factors&#44; oxidative stress&#44; psychological factors&#44; and patterns of autoimmune response&#46; The integration of these theories is the main challenge in the construction of pathophysiological models&#46;</p></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Financial support</span><p id="par0410" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Authors&#8217; contributions</span><p id="par0415" class="elsevierStylePara elsevierViewall">Helena Zenedin Marchioro&#58; Approval of the final version of the manuscript&#59; drafting and editing of the manuscript&#59; critical review of the literature&#59; critical review of the manuscript&#46;</p><p id="par0420" class="elsevierStylePara elsevierViewall">Caio C&#233;sar Silva de Castro&#58; Approval of the final version of the manuscript&#59; design and planning of the study&#59; drafting and editing of the manuscript&#59; critical review of the literature&#59; critical review of the manuscript&#46;</p><p id="par0425" class="elsevierStylePara elsevierViewall">Vinicius Medeiros Fava&#58; Approval of the final version of the manuscript&#59; drafting and editing of the manuscript&#59; critical review of the literature&#59; critical review of the manuscript&#46;</p><p id="par0430" class="elsevierStylePara elsevierViewall">Paula Hitomi Sakiyama&#58; Approval of the final version of the manuscript&#59; drafting and editing of the manuscript&#59; critical review of the literature&#59; critical review of the manuscript&#46;</p><p id="par0435" class="elsevierStylePara elsevierViewall">Gerson Dellatorre&#58; Approval of the final version of the manuscript&#59; drafting and editing of the manuscript&#59; critical review of the literature&#59; critical review of the manuscript&#46;</p><p id="par0440" class="elsevierStylePara elsevierViewall">H&#233;lio Amante Miot&#58; Approval of the final version of the manuscript&#59; design and planning of the study&#59; drafting and editing of the manuscript&#59; critical review of the literature&#59; critical review of the manuscript&#46;</p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Conflicts of interest</span><p id="par0445" class="elsevierStylePara elsevierViewall">Dr&#46; Caio Castro&#58; Advisory Board &#8211; Abbvie&#44; Sun Pharma and Ach&#233;&#46; Dr&#46; H&#233;lio Miot&#58; Advisory Board &#8211; L&#8217;Or&#233;al&#59; Merz&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Vitiligo is a complex disease whose pathogenesis results from the interaction of genetic components&#44; metabolic factors linked to cellular oxidative stress&#44; melanocyte adhesion to the epithelium&#44; and immunity &#40;innate and adaptive&#41;&#44; which culminate in aggression against melanocytes&#46; In vitiligo&#44; melanocytes are more sensitive to oxidative damage&#44; leading to the increased expression of proinflammatory proteins such as HSP70&#46; The lower expression of epithelial adhesion molecules&#44; such as DDR1 and E-cadherin&#44; facilitates damage to melanocytes and exposure of antigens that favor autoimmunity&#46; Activation of the type 1-IFN pathway perpetuates the direct action of CD8&#43; cells against melanocytes&#44; facilitated by regulatory T-cell dysfunction&#46; The identification of several genes involved in these processes sets the stage for disease development and maintenance&#46; However&#44; the relationship of vitiligo with environmental factors&#44; psychological stress&#44; comorbidities&#44; and the elements that define individual susceptibility to the disease are a challenge to the integration of theories related to its pathogenesis&#46;</p></span>"
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Segmental vitiligo on the flank of a dark-skinned patient&#46; Achromic macula&#44; with zosteriform distribution&#59; the periphery of the lesion shows a leukomelanoderma band&#44; with several follicular repigmentation points &#8211; Source&#58; authors&#8217; file&#46;</p>"
        ]
      ]
      1 => array:8 [
        "identificador" => "fig0010"
        "etiqueta" => "Figure 2"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr2.jpeg"
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          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Active vitiligo&#46; Histopathology&#58; perivascular lymphocytic infiltrate&#44; with epidermal aggression and basal layer vacuolar degeneration foci &#40;Hematoxylin &#38;eosin&#44; &#215;40&#41;&#46; Picture is a courtesy of Dr&#46; Lismary Mosque&#46;</p>"
        ]
      ]
      2 => array:8 [
        "identificador" => "fig0015"
        "etiqueta" => "Figure 3"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr3.jpeg"
            "Alto" => 1978
            "Ancho" => 1675
            "Tamanyo" => 412352
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          0 => array:3 [
            "identificador" => "at0015"
            "detalle" => "Figure "
            "rol" => "short"
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        "descripcion" => array:1 [
          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Representation of Oxidative Stress &#40;OS&#41; and activation of innate immunity in vitiligo&#46; The effects of ultraviolet radiation &#40;UVR&#41;&#44; phenolic compounds and trauma &#40;K&#246;bner&#41; increase the production of reactive oxygen species &#40;ROS&#41;&#46; In parallel&#44; genetic predisposition &#40;such as mutations in the <span class="elsevierStyleItalic">FOXO3A</span> gene&#41; lead to the inefficiency of antioxidant mechanisms&#44; observed by an increase in the superoxide dismutase &#40;SOD&#41; enzyme&#44; reduction in catalase &#40;CAT&#41; and glutathione &#40;Glu&#41;&#44; causing an imbalance in the redox status&#46; OS also causes an accumulation of defective proteins in the endoplasmic reticulum&#44; resulting in a phenomenon called the response to unfolded proteins &#40;UPr&#41;&#44; contributing to the process of autophagy leading to the production of proinflammatory interleukins &#40;IL6 and IL8&#41;&#46; The increased expression of TRPM2 &#40;transient receptor potential cation channel subfamily M member 2&#41;&#44; also induced by OS&#44; promotes an influx of calcium into the melanocyte&#44; culminating in its apoptosis&#46; The OS promotes the release of DAMPs &#40;damage-associated molecular patterns&#41;&#44; especially HSP70&#44; which initiate the innate response from the activation of dendritic cells &#40;DC&#41; and the participation of NK cells &#40;natural killer&#41; &#8211; Source&#58; the authors&#46;</p>"
        ]
      ]
      3 => array:8 [
        "identificador" => "fig0020"
        "etiqueta" => "Figure 4"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr4.jpeg"
            "Alto" => 1317
            "Ancho" => 1675
            "Tamanyo" => 264485
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        "detalles" => array:1 [
          0 => array:3 [
            "identificador" => "at0020"
            "detalle" => "Figure "
            "rol" => "short"
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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Representation of Interleukin &#40;IL&#41;-15 transpresentation in keratinocytes induced by oxidative stress &#40;OS&#41; and the interaction of interferon gamma &#40;IFN&#947;&#41; with the Janus kinase&#47;signal transducers and transcription activators &#40;JAK&#47;STAT&#41; pathway&#46; The OS promotes the transpresentation of I-15 in keratinocytes through the binding of IL-15 to the heterodimeric IL-15 receptor &#40;IL15R&#41; on memory CD8&#8239;&#43;&#8239;T lymphocytes&#44; consisting of CD122 and CD132&#44; and to the I-15&#945; receptor &#40;IL15R&#945;&#41; on keratinocytes &#40;CD215&#41;&#46; This process potentiates the activation of memory CD8&#8239;&#43;&#8239;T Cells and the production of inflammatory cytokines&#44; such as IFNy&#44; via JAK&#47;STAT signaling &#40;JAK1-STAT3 and JAK3-STAT5&#41;&#46; The IFN&#947;&#47;STAT1&#47;CXCL10 axis conducts the autoimmune destruction of melanocytes&#46; IFN&#947; signals through the IFN&#947; receptor &#40;IFN&#947;R&#41; to stimulate JAK1&#47;JAK2 and activate STAT1&#46; The activation induces the production of CXCL9 and CXCL10&#44; which signals through the CXCR3 receptor for the recruitment of more autoreactive CD8&#43; T cells &#8211; Source&#58; the authors&#46;</p>"
        ]
      ]
      4 => array:8 [
        "identificador" => "fig0025"
        "etiqueta" => "Figure 5"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr5.jpeg"
            "Alto" => 1171
            "Ancho" => 1675
            "Tamanyo" => 344332
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        "detalles" => array:1 [
          0 => array:3 [
            "identificador" => "at0025"
            "detalle" => "Figure "
            "rol" => "short"
          ]
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        "descripcion" => array:1 [
          "en" => "<p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Representation of alterations related to adaptive immunity in vitiligo&#46; Melanocytes affected by oxidative stress &#40;OS&#41; trigger the activation of innate immunity through the secretion of exosomes&#44; which contain damage-associated molecular patterns &#40;DAMPs&#41;&#44; especially heat shock protein 70 &#40;HSP70&#41;&#46; HSP70 stimulates the secretion of IFN&#945; by dendritic cells in the initial phase of disease progression&#44; which induces the production of chemokines CXCL9 and CXCL10 by keratinocytes and the recruitment of T-cells expressing the CXCR3 receptor&#46; CXCL10 has an effector action&#44; while CXCL9 acts on the global recruitment of autoreactive CD8&#43; T-cells&#46; Effector CD8&#43; T-cells are responsible for the destruction of melanocytes through the production of interferon gamma &#40;IFN&#947;&#41;&#44; release of granzymes and perforins&#44; facilitated by T- regulatory &#40;Treg&#41; cell dysfunction&#46; CD8&#43; tissue-resident memory T cells &#40;TRM&#41; develop after the onset of the T-cell-mediated immune response and are implicated in disease maintenance&#44; being retained in the tissue due to IL15 transpresentation by keratinocytes &#8211; Source&#58; the authors&#46;</p>"
        ]
      ]
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        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
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            "detalle" => "Table "
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Gene</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Expression</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">NLRP1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#43;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">XBP1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleBold">&#43;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">FOXD3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#43;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">PDGFRA</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleBold">&#43;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">PTPN22</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#43;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">IKZF4</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#43;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">FOXP3</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#43;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">DDR1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">-&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">HLA</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Risk</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-A&#42;02&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-Aw&#42;31&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-A&#42;32&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-A&#42;33&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-A&#42;09&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8595;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-Aw&#42;19&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8595;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-DQB1&#42;06&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-DQB1&#42;0303&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-DR4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-DRB1&#42;07&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HLA-DR7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">&#8593;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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          "en" => "<p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Main genes and histocompatibility antigens &#40;HLA&#41; involved in the pathogenesis of vitiligo&#46;</p>"
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                  \t\t\t\t" class=""><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Autoimmune or auto-inflammatory disease</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Alopecia areata&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Pernicious anemia&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Rheumatoid arthritis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Atopic dermatitis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Dermatomyositis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Type 1 Diabetes Mellitus&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Addison&#8217;s disease&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Crohn&#8217;s disease&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Graves&#8217; disease&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Systemic scleroderma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Multiple sclerosis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Systemic lupus erythematosus&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Psoriasis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Ulcerative colitis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Sjogren&#8217;s Syndrome&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Hashimoto&#8217;s Thyroiditis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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          "leyenda" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">HSP70&#44; heat shock protein 70&#59; JAK&#44; Janus kinase&#59; SYK&#44; spleen tyrosine kinase&#59; TYK&#44; tyrosine kinase&#59; IFNy&#44; interferon gama&#59; IL&#44; interleukin&#59; mAb&#44; monoclonal antibody&#46;</p>"
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                0 => """
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Class &#47; Drug&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Therapeutic target&#47; Action mechanism&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Mutant HSP70 protein&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " rowspan="2" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Innate immunity inhibition &#8210; reduced dendritic cell activation</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">HSP70iQ435A&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " rowspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Adaptive immunity &#8210; alteration in cytokine&#47;chemokine signaling &#40;IFNy&#44; CXCL10&#44; IL15&#41;</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">Tofacitinibe &#40;JAK1&#47;3&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Ruxolitinibe &#40;JAK1&#47;2&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Cerdulatinib &#40;SYK&#47;JAK 1&#47;2&#47;3&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">ATI-50002 &#40;JAK1&#47;3&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PF-06651600 &#40;JAK3&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PF-06700841 &#40;TYK2&#47;JAK1&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Anti-IL15 Biologicals&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " rowspan="3" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Adaptive immunity &#8211; blocking of IL15 signaling</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Anti-CD122 mAb&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">AMG 714 &#40;Anti-IL15 mAb&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
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          "en" => "<p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Main emerging therapies and therapeutic targets in vitiligo&#46;</p>"
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          "identificador" => "bibs0005"
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                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "The prevalence of vitiligo&#58; a meta-analysis"
                      "autores" => array:1 [
                        0 => array:2 [ …2]
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                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1371/journal.pone.0166947"
                      "Revista" => array:4 [
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                    ]
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                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Prevalence of vitiligo in Brazil&#8212;a population survey"
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                        0 => array:2 [ …2]
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                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1111/pcmr.12681"
                      "Revista" => array:6 [
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                  "contribucion" => array:1 [
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                      "titulo" => "A pattern of association between clinical form of vitiligo and disease-related variables in a Brazilian population"
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                    ]
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                  "host" => array:1 [
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              "etiqueta" => "4"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Quality of life impairment in children and adults with vitiligo&#58; a cross-sectional study based on dermatology-specific and disease-specific quality of life instruments"
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                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1159/000448656"
                      "Revista" => array:6 [
                        "tituloSerie" => "Dermatology"
                        "fecha" => "2016"
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                        "link" => array:1 [ …1]
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              "etiqueta" => "5"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Consensus on the treatment of vitiligo &#8212; Brazilian Society of Dermatology"
                      "autores" => array:1 [
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                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Vitiligo&#58; complex segregation and linkage disequilibrium analyses with respect to microsatellite loci spanning the HLA"
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                  "host" => array:1 [
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                0 => array:2 [
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                    0 => array:2 [
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                        "fecha" => "2004"
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                        "link" => array:1 [ …1]
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                      "titulo" => "Novel vitiligo susceptibility loci on chromosomes 7 &#40;AIS2&#41; and 8 &#40;AIS3&#41;&#44; confirmation of SLEV1 on chromosome 17&#44; and their roles in an autoimmune diathesis"
                      "autores" => array:1 [
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                      "Revista" => array:6 [
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                        "fecha" => "2004"
                        "volumen" => "74"
                        "paginaInicial" => "188"
                        "paginaFinal" => "191"
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                      "titulo" => "NALP1 in vitiligo-associated multiple autoimmune disease"
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                        0 => array:2 [ …2]
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                    0 => array:2 [
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                      "Revista" => array:6 [
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                        "fecha" => "2007"
                        "volumen" => "356"
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Article information

ISSN: 03650596
Original language: English

DOI:10.1016/j.abd.2021.09.008

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