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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Alopecia Areata &#40;AA&#41; is a disease that causes hair loss without scarring&#46; The disease targets the epithelium of hair follicles and involves hair-bearing areas of the head and the other parts of the body&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> The prevalence of AA in the general population is estimated to be 0&#46;1&#37;&#8211;0&#46;2&#37; and the life-long risk of developing AA is estimated to be nearly 1&#46;7&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> The clinical presentation of AA can be as one or multiple patches of hair loss on the scalp or&#44; much rarer&#44; as complete baldness &#40;alopecia totalis&#41; or total loss of body hair &#40;alopecia universalis&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> Disease severity is assessed by using the Severity of Alopecia Tool &#40;SALT&#41; scores&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The etiopathogenesis of AA has not been fully clarified yet&#46; In their study&#44; Petukhova et al&#46; showed that genetic background has a role in the pathogenesis&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> In addition to genetic background&#44; environmental and immune factors are considered to have a role&#46;<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;6</span></a> There is growing evidence that it is a polygenic autoimmune disease&#46; Earlier studies have demonstrated a relationship between AA and HLA alleles&#44; some DQB and DR alleles&#44; and Interleukin &#40;IL&#41;-1 cluster genes&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">In the treatment of severe AA&#44; there is a limited response to traditional approaches&#44; and the search for effective treatment is ongoing&#46; Treatments that target different immune system pathways are being introduced as new therapeutic options&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> Case reports&#44; case series&#44; and open-label studies on the use of Tofacitinib&#44; a Janus kinase &#40;JAK&#41; 1 and 3 inhibitors&#44; have been published in recent years&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> Previous studies showed that interleukins especially IL-2&#44; IL-4&#44; and IL-15 may have a role in the pathogenesis of AA&#46; Current studies also mention IL-17 as a potential pro-inflammatory cytokine having a role in the disease mechanism&#46; Tofacitinib is JAK inhibitor that interferes with JAK1 and JAK3&#46; JAK3 interacts with the cytokine receptor&#44; the cyc&#44; which is specifically used for some interleukin receptors including IL-2&#44; IL-4&#44; IL15&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> Also&#44; tofacitinib inhibits Th17 cells that produce IL-17&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The present study aimed to determine the serum levels of interleukins &#40;IL-2&#44; IL-4&#44; IL-15&#44; and IL-17&#41;&#44; which are likely to play a role in the pathogenesis in patients diagnosed with AA&#46; In comparison to previous studies&#44; the relationship of interleukin levels with the duration and severity &#40;SALT score&#41; of AA and the response to tofacitinib therapy was also investigated&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Methods</span><p id="par0025" class="elsevierStylePara elsevierViewall">Patients aged &#8805;16 years old&#44; who had been clinically diagnosed with AA between 01&#46;09&#46;2019 and 01&#46;06&#46;2020 at the study&#8217;s faculty were enrolled in the study&#46; Some patients had hair loss in their bodies in addition to hair loss in the scalp&#46; Patients with acute or chronic critical illnesses that may hinder the study&#44; who are pregnant or in lactation period&#44; receiving any drugs that may interfere with interleukin levels&#44; and those who had received any treatment including topical therapy for AA in the last 2 months were excluded&#46; Acute or chronic critical illnesses include any organ dysfunction or presence of an infection that needs to be treated or followed&#46; The control group consisted of healthy individuals without any acute or chronic disease&#46; They were willing to take part in the research and recruited from public domains&#46; Approval of the Ethics Committee &#40;IUC Date and n&#186; 07&#47;08&#47;2019-121094&#41; and informed consents of all participants were obtained before the study&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Demographic and clinical information of the patients were inquired&#46; Baseline serum IL levels of the patients and the controls were measured&#46; In the patient group receiving tofacitinib therapy&#44; serum IL levels were measured again after 6 months of treatment&#46; Patients with AA who were resistant to topical therapy were started to tofacitinib therapy after taking their informed consents&#46; Before starting the treatment with tofacitinib&#44; hemogram&#44; liver function tests&#44; kidney function tests&#44; amylase&#44; lipase levels&#44; viral serology&#44; quantiferon test&#44; and chest-X-Ray were asked from all patients&#46; Blood tests were repeated every month and patients were followed in the study&#8217;s clinic&#46; The daily dose of tofacitinib was 10&#160;mg&#47;day&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Disease severity for AA was assessed using the SALT&#46; In the SALT scoring system&#44; the scalp is divided into 4 areas&#59; vertex corresponds to 40&#37;&#44; right profile corresponds to 18&#37;&#44; left profile corresponds to 18&#37; and occipital region corresponds to 24&#37; of the scalp surface area&#46; After determining the percentage of hair loss in these 4 regions&#44; it is multiplied by the percentage value that corresponds to the relevant area&#44; and then the SALT score is obtained as the sum of the scores obtained from each of the 4 areas&#46; Higher scores indicate severe disease&#59; total hair loss on the scalp corresponds to 100 points&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">Peripheral blood samples taken from the patients and the controls to analyze serum interleukin levels were centrifuged at 3000&#160;rpm for 10 minutes&#44; and then the serum was separated and stored at &#8722;30&#160;&#176;C until the time of analysis&#46; Serum IL-2&#44; IL-4&#44; IL-15&#44; and IL-17 levels were measured by the ELISA method&#46; The values were presented as ng&#47;L&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Statistical analysis</span><p id="par0045" class="elsevierStylePara elsevierViewall">Data were analyzed using the PASW Statistics for Windows&#44; Version 18&#46;0 &#40;SPSS Inc&#46;&#44; Chicago&#44; IL&#44; USA&#41;&#46; The suitability of variables to normal distribution was analyzed by visual &#40;histogram and probability graphics&#41; and analytic methods &#40;Kolmogorov-Smirnov&#47;Shapiro-Wilk tests&#41;&#46; Descriptive statistics were presented as numbers and percentages for categorical variables and as median&#44; percentile 25 &#40;Q1&#41; and percentile 75 &#40;Q3&#41; for numerical variables&#46; For categorical variables&#44; paired group comparison was performed using the Chi-Square test&#46; As normal distribution condition was not provided&#44; the Mann-Whitney <span class="elsevierStyleItalic">U</span> test was used in paired group comparison for numerical variables&#46; Pre-post analyses for each group were performed using the Wilcoxon Signed Rank test&#46; The relationship between numerical variables was analyzed by Spearman&#8217;s rho test&#46; The situations where type 1 error was below 5&#37; were interpreted as statistically significant&#46;</p></span></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Results</span><p id="par0050" class="elsevierStylePara elsevierViewall">The study included 61 AA patients and 30 healthy volunteers as the control group&#46; The patient group and the control group were comparable in terms of age and sex &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46; The mean disease duration for AA was 7&#160;&#177;&#160;6 years and the baseline mean SALT score was 71&#160;&#177;&#160;30 &#40;range&#44; 20&#8211;100&#41;&#46; Tofacitinib treatment was used in 52&#46;5&#37; of the patients&#46; In the remaining group&#44; 36&#46;1&#37; of patients were started other treatments including topical immunotherapy and systemic steroid treatment&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0055" class="elsevierStylePara elsevierViewall">Serum IL concentrations of the patients and the control group are demonstrated in <a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#46; Baseline IL-2&#44; IL-4&#44; and IL-15 levels were significantly higher in the patient group as compared to those of the control group&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0060" class="elsevierStylePara elsevierViewall">IL levels were analyzed according to the genders in the patient group and the control group&#46; No significant difference was determined between males and females in terms of IL levels both in the patient and control groups &#40;<a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia><p id="par0065" class="elsevierStylePara elsevierViewall">No statistically significant correlation was found between baseline IL levels and either disease duration or disease severity &#40;baseline SALT score&#41; &#40;<a class="elsevierStyleCrossRef" href="#tbl0020">Table 4</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0020"></elsevierMultimedia><p id="par0070" class="elsevierStylePara elsevierViewall">There were 32 patients receiving tofacitinib&#46; Pre- and post-treatment IL levels and SALT scores were compared in 22 of these patients&#44; in whom the measurements were repeated at the 6<span class="elsevierStyleSup">th</span> month&#46; A significant decrease was found in all IL levels after treatment when compared to those before treatment &#40;baseline&#41;&#46; Additionally&#44; a significant decrease was observed in disease severity assessed by SALT score &#40;<a class="elsevierStyleCrossRef" href="#tbl0025">Table 5</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0025"></elsevierMultimedia><p id="par0075" class="elsevierStylePara elsevierViewall">There was no significant relationship between the change in IL levels and the change in the SALT scores after treatment in comparison to that before treatment in the patients receiving tofacitinib &#40;<a class="elsevierStyleCrossRef" href="#tbl0030">Table 6</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0030"></elsevierMultimedia></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Discussion</span><p id="par0080" class="elsevierStylePara elsevierViewall">Depending on disease severity&#44; the psychosocial status of AA patients is influenced&#44; and their quality of life is impaired&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> The absence of a curative treatment for this disease leads to the continuation of the search for efficient treatment and studies to illuminate the pathogenesis&#46; It is thought that immunological mechanisms are effective in the pathogenesis of AA and that various cytokines such as Interferon &#40;IFN&#41;&#44; Tumor Necrotizing Factor &#40;TNF&#41;&#44; and interleukins as well play a role&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">12&#44;13</span></a></p><p id="par0085" class="elsevierStylePara elsevierViewall">There is a limited number of clinical studies investigating the relationship of interleukins with disease severity and its role in the pathogenesis of AA&#46; In the present study&#44; the authors evaluated the levels of IL-2&#44; IL-4&#44; IL-15&#44; and IL-17&#46; Baseline IL-2&#44; IL-4&#44; and IL-15 levels were significantly higher in the patient group than those in the control group &#40;p&#160;&#60;&#160;0&#46;001 for each&#41;&#46; No significant correlation was found between the baseline interleukin levels and either disease duration or disease severity&#46; There was no statistically significant difference between IL-17 levels of the patient and control group and no significant correlation between IL-17 levels and duration or severity of AA&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">IL-2 is a cytokine playing a role in immune memory with a proven relationship with autoimmune conditions&#44; and the use of IL-2 or its receptors in immunotherapy is debatable&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a> Kasumagi&#263;-Halilovic et al&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> found higher IL-2 levels in AA patients as compared to that of the controls&#46; No correlation was found between IL-2 levels and clinical type of AA or disease duration&#46; Likewise&#44; the authors also found higher IL-2 levels in AA patients than that in the controls&#46; The authors found no significant correlation between IL-2 levels and duration or severity of AA&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">IL-4 is an interleukin that takes part in various physiological and pathological processes and plays a role in tissue adhesion and inflammation&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> Kalkan et al&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> concluded that IL-4 VNTR polymorphism might be a risk factor for the development of AA&#46; In the present study&#44; IL-4 levels were higher in AA patients when compared to that of the controls &#40;p&#160;&#60;&#160;0&#46;001&#41;&#46; There was no significant correlation between IL-4 levels and duration or severity of AA&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">IL-15 is a multifunctional cytokine with a documented relationship with autoimmune diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a> Ebrahim et al&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> reported higher serum IL-15 levels in AA patients as compared to the controls and a significantly positive correlation between SALT scores and IL-15 levels&#46; They concluded that IL-15 might be a marker of AA severity&#46; In the present study&#44; likewise&#44; IL-15 levels were higher in AA patients in comparison to that of the controls &#40;p&#160;&#60;&#160;0&#46;001&#41;&#46; However&#44; no significant correlation was found between IL-15 levels and duration or severity of AA&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">IL-17 is a cytokine that plays a critical role in the epithelial barrier of the body parts that are frequently exposed to microorganisms&#44; as well as in immunopathology&#44; host defense&#44; and inflammation&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> El-Morsy et al&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> determined higher serum IL-17A levels in AA patients as compared to the controls&#59; nevertheless&#44; they reported the absence of a significant correlation between IL-17A levels and gender&#44; disease duration&#44; SALT score or disease severity&#46; Based on these findings&#44; they concluded that IL-17A potentially plays a role in the pathogenesis but does not affect disease severity&#46; In another study&#44; no difference was found between IL-17A levels of AA patients and of the controls&#59; however&#44; patients&#8217; IL-17A levels showed a significant decrease after Narrowband-Ultraviolet B treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a> Loh et al&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> reported higher serum IL-17 levels in AA patients as compared to the controls in their study&#46; In their review&#44; Ramot et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a> concluded that there is no clear relationship between IL-17 levels and disease severity or duration despite higher IL-17 levels reported in AA patients&#46; In the present study&#44; although IL-17 level was higher in AA patients than the controls&#44; the difference was not statistically significant&#46; Furthermore&#44; there was no significant correlation between IL-17 levels and duration or severity of AA&#46;</p><p id="par0110" class="elsevierStylePara elsevierViewall">Drug selection for the treatment of AA depends on numerous factors such as patient&#8217;s age&#44; extensiveness&#47;duration of the disease&#44; patient&#8217;s expectation&#44; treatment cost&#44; and presence of comorbidity&#46; Although there is no curative treatment yet&#44; various therapies are being implemented to provide remission&#46; Corticosteroids&#44; topical minoxidil&#44; topical immunotherapy &#40;DPCP&#44; SADBE&#41;&#44; anthralin&#44; phototherapy&#44; immunosuppressive agents&#44; prostaglandin analogs&#44; biologics&#44; and JAK inhibitors are among the therapies that are currently being implemented and considered beneficial&#46;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a> Recently&#44; along with increasing information on the pathogenesis and the introduction of the role of the JAK pathway&#44; the therapeutic potential of JAK inhibitors &#40;tofacitinib&#44; ruxolitinib and baricitinib&#41; in AA began to attract attention&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> Beneficial effects of tofacitinib in the treatment of moderate-severe AA have been reported in case series and clinical studies&#46;<a class="elsevierStyleCrossRefs" href="#bib0135"><span class="elsevierStyleSup">27&#8211;31</span></a> Guo et al&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a> carried out a systematic review and a meta-analysis and reported that tofacitinib is beneficial in the treatment of AA patients and causes only mild adverse events&#44; and they recommended verification of these data in future randomized&#44; large-scale clinical trials&#46; In the present study&#44; interleukin levels were re-studied&#44; and the SALT score was re-measured at the 6<span class="elsevierStyleSup">th</span> month of treatment in 22 of the AA patients receiving tofacitinib&#46; While the patients&#8217; median &#40;Q1&#8211;Q3&#41; SALT score was 100 &#40;50&#8211;100&#41; at baseline&#44; it became 40 &#40;24&#8211;50&#41; at the 6<span class="elsevierStyleSup">th</span> month of tofacitinib therapy&#46; This decrease in disease severity was found statistically significant &#40;p&#160;&#60;&#160;0&#46;001&#41;&#46; The interleukin levels of the patients studied in the present study demonstrated significant reduction with tofacitinib therapy&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">In conclusion&#44; high interleukin levels in AA patients and the significant decrease with treatment support the idea that interleukins have a role in pathogenesis&#46; Nevertheless&#44; no relationship could be demonstrated between IL levels and disease duration or severity&#46; Further studies with larger patient populations are required&#46; Understanding the role of interleukins in pathogenesis will make a contribution to the development of new targeted therapies&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Conclusion</span><p id="par0120" class="elsevierStylePara elsevierViewall">High interleukin levels in alopecia areata patients and the significant decrease following tofacitinib treatment support the idea that interleukins have a role in the pathogenesis of AA&#46; Further studies are needed to investigate the role of interleukins in the pathogenesis of AA&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Financial support</span><p id="par0125" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Authors&#39; contributions</span><p id="par0130" class="elsevierStylePara elsevierViewall">&#214;zge a&#351;k&#305;n&#58; Approval of the final version of the manuscript&#59; critical literature review&#59; data collection&#44; analysis and interpretation&#59; effective participation in research orientation&#59; &#305;ntellectual participation in propaedeutic and&#47;or therapeutic management of studied cases&#59; manuscript critical review&#59; preparation and writing of the manuscript&#59; statistical analysis&#59; study conception and planning&#46;</p><p id="par0135" class="elsevierStylePara elsevierViewall">Sera Nur Y&#252;cesoy&#58; Approval of the final version of the manuscript&#59; critical literature review&#59; data collection&#44; analysis and interpretation&#59; effective participation in research orientation&#59; &#305;ntellectual participation in propaedeutic and&#47;or therapeutic management of studied cases&#59; manuscript critical review&#59; preparation and writing of the manuscript&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">Erkam Co&#351;kun&#58; Approval of the final version of the manuscript&#59; critical literature review&#59; data collection&#44; analysis and interpretation&#59; effective participation in research orientation&#46;</p><p id="par0145" class="elsevierStylePara elsevierViewall">Burhan Engin&#58; Approval of the final version of the manuscript&#59; critical literature review&#59; data collection&#44; analysis and interpretation&#59; effective participation in research orientation&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">Server Serdaro&#287;lu&#58; Approval of the final version of the manuscript&#59; critical literature review&#59; data collection&#44; analysis and interpretation&#59; effective participation in research orientation&#59; &#305;ntellectual participation in propaedeutic and&#47;or therapeutic management of studied cases&#59; manuscript critical review&#59; preparation and writing of the manuscript&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Conflicts of interest</span><p id="par0155" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span></span>"
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          "palabras" => array:3 [
            0 => "Alopecia"
            1 => "Alopecia areata"
            2 => "Interleukins"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Background</span><p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">Alopecia areata &#40;AA&#41; is a hair disease that causes hair loss without scarring&#46; The etiopathogenesis of AA has not been fully understood yet&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Objective</span><p id="spar0075" class="elsevierStyleSimplePara elsevierViewall">To determine serum interleukin levels &#40;IL-2&#44; IL-4&#44; IL-15&#44; and IL-17&#41; in patients diagnosed with alopecia areata and to investigate the relationship of IL levels with the duration and severity of alopecia areata and the response to tofacitinib therapy&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Methods</span><p id="spar0080" class="elsevierStyleSimplePara elsevierViewall">Patients &#40;&#8805;16 years old&#41; diagnosed with alopecia areata and healthy individuals as a control group was enrolled&#46; Baseline serum interleukin levels of the patients and controls were measured&#46; In the patient group receiving tofacitinib therapy&#44; serum interleukin levels were measured again after 6 months&#46; Disease severity for alopecia areata was assessed using the Severity of Alopecia Tool&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Results</span><p id="spar0085" class="elsevierStyleSimplePara elsevierViewall">Sixty-one AA patients and 30 healthy individuals were included&#59; they were comparable regarding age and sex&#46; The mean disease duration for AA was 7&#160;&#177;&#160;6 years and the baseline mean Severity of Alopecia Tool score was 71&#160;&#177;&#160;30 &#40;range&#44; 20&#8211;100&#41;&#46; Baseline IL-2&#44; IL-4 and IL-15 levels were significantly higher in the patient group than those in the control group &#40;p&#160;&#60;&#160;0&#46;001 for each&#41;&#46; No significant correlation was found between the baseline interleukin levels and either disease duration or disease severity &#40;baseline Severity of Alopecia Tool score&#41;&#46; Among the patients receiving tofacitinib &#40;n&#160;&#61;&#160;22&#41;&#44; all interleukin levels significantly decreased after treatment&#46; However&#44; no significant relationship between the change in interleukin levels and the change in the Severity of Alopecia Tool scores was observed after tofacitinib treatment&#46;</p></span> <span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Study limitations</span><p id="spar0090" class="elsevierStyleSimplePara elsevierViewall">This is a monocentric study conducted in a single university hospital&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Conclusion</span><p id="spar0095" class="elsevierStyleSimplePara elsevierViewall">High interleukin levels in alopecia areata patients and the significant decrease with treatment support the idea that interleukins have a role in pathogenesis&#46; Nevertheless&#44; no relationship could be demonstrated between IL levels and disease duration or severity&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">How to cite this article&#58; A&#351;k&#305;n &#214;&#44; Y&#252;cesoy SN&#44; Co&#351;kun E&#44; Engin B&#44; Serdaro&#287;lu S&#46; Evaluation of the level of serum Interleukins &#40;IL-2&#44; IL-4&#44; IL-15 andIL-17&#41; and its relationship with disease severity in patients with alopecia areata&#46; An Bras Dermatol&#46; 2021&#59;96&#58;551&#8211;7&#46;</p>"
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          "leyenda" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">The values are presented as number &#40;&#37;&#41; or mean&#160;&#177;&#160;standard deviation&#44; and median &#40;Q1&#8211;Q3&#41;&#46;</p><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">DPCP&#44; Diphenylcyclopropenone&#59; SADBE&#44; Squaric Acid Dibutylester&#59; SALT&#44; Severity of Alopecia Tool&#46;</p>"
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                  \t\t\t\t">85&#46;03 &#40;57&#46;33&#8211;192&#46;49&#41;&nbsp;\t\t\t\t\t\t\n
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                  """
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                  """
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                  \t\t\t\t" scope="col">Pre-treatment &#40;n&#160;&#61;&#160;22&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">Post-treatment &#40;n&#160;&#61;&#160;22&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " rowspan="2" align="left" valign="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Median &#40;Q1&#8211;Q3&#41;&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">Median &#40;Q1&#8211;Q3&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">100 &#40;50&#8211;100&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">248&#46;96 &#40;174&#46;55&#8211;298&#46;89&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#60; 0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>IL-4&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">317&#46;16 &#40;276&#46;71&#8211;504&#46;72&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">152&#46;0 &#40;128&#46;08&#8211;290&#46;31&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>IL-15&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">49&#46;32 &#40;38&#46;77&#8211;82&#46;34&#41;&nbsp;\t\t\t\t\t\t\n
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                    0 => array:2 [
                      "titulo" => "Alopecia areata"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:2 [
                            0 => "K&#46;L&#46;E&#46; Hon"
                            1 => "A&#46;K&#46;C&#46; Leung"
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                    0 => array:2 [
                      "doi" => "10.2174/187221311795399291"
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                        "tituloSerie" => "Recent Pat Inflamm Allergy Drug Discov&#46;"
                        "fecha" => "2011"
                        "volumen" => "5"
                        "paginaInicial" => "98"
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                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/21453266"
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                          "etal" => false
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                            0 => "R&#46;M&#46; Tr&#252;eb"
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                      "doi" => "10.1007/s12016-017-8620-9"
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                        "link" => array:1 [
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                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/28717940"
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                  "contribucion" => array:1 [
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                  ]
                  "host" => array:1 [
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                      "doi" => "10.1016/j.jaad.2003.09.032"
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                        "tituloSerie" => "J Am Acad Dermatol&#46;"
                        "fecha" => "2004"
                        "volumen" => "51"
                        "paginaInicial" => "440"
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Journal Information
Vol. 96. Issue 5.
Pages 551-557 (1 September 2021)
Visits
8252
Vol. 96. Issue 5.
Pages 551-557 (1 September 2021)
Original Article
Open Access
Evaluation of the level of serum Interleukins (IL-2, IL-4, IL-15 andIL-17) and its relationship with disease severity in patients with alopecia areata
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8252
Özge Aşkın, Sera Nur Yücesoy
Corresponding author
syucesoy@ku.edu.tr

Corresponding author.
, Erkam Coşkun, Burhan Engin, Server Serdaroğlu
Istanbul University Cerrahpasa Medical Faculty, Istanbul, Turkey
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Abstract
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Tables (6)
Table 1. General characteristics of alopecia areata patients and the controls.
Table 2. Baseline interleukin levels of the patient and control groups.
Table 3. Interleukin levels according to the sex.
Table 4. Correlation between baseline interleukin levels and disease duration and disease severity (Severity of Alopecia Tool score).
Table 5. Interleukin levels and Severity of Alopecia Tool scores in the patients receiving tofacitinib treatment.
Table 6. Relationship between the change in interleukin levels and the change in Severity of Alopecia Tool scores in the patients receiving tofacitinib treatment.
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Abstract
Background

Alopecia areata (AA) is a hair disease that causes hair loss without scarring. The etiopathogenesis of AA has not been fully understood yet.

Objective

To determine serum interleukin levels (IL-2, IL-4, IL-15, and IL-17) in patients diagnosed with alopecia areata and to investigate the relationship of IL levels with the duration and severity of alopecia areata and the response to tofacitinib therapy.

Methods

Patients (≥16 years old) diagnosed with alopecia areata and healthy individuals as a control group was enrolled. Baseline serum interleukin levels of the patients and controls were measured. In the patient group receiving tofacitinib therapy, serum interleukin levels were measured again after 6 months. Disease severity for alopecia areata was assessed using the Severity of Alopecia Tool.

Results

Sixty-one AA patients and 30 healthy individuals were included; they were comparable regarding age and sex. The mean disease duration for AA was 7 ± 6 years and the baseline mean Severity of Alopecia Tool score was 71 ± 30 (range, 20–100). Baseline IL-2, IL-4 and IL-15 levels were significantly higher in the patient group than those in the control group (p < 0.001 for each). No significant correlation was found between the baseline interleukin levels and either disease duration or disease severity (baseline Severity of Alopecia Tool score). Among the patients receiving tofacitinib (n = 22), all interleukin levels significantly decreased after treatment. However, no significant relationship between the change in interleukin levels and the change in the Severity of Alopecia Tool scores was observed after tofacitinib treatment.

Study limitations

This is a monocentric study conducted in a single university hospital.

Conclusion

High interleukin levels in alopecia areata patients and the significant decrease with treatment support the idea that interleukins have a role in pathogenesis. Nevertheless, no relationship could be demonstrated between IL levels and disease duration or severity.

Keywords:
Alopecia
Alopecia areata
Interleukins
Full Text
Introduction

Alopecia Areata (AA) is a disease that causes hair loss without scarring. The disease targets the epithelium of hair follicles and involves hair-bearing areas of the head and the other parts of the body.1 The prevalence of AA in the general population is estimated to be 0.1%–0.2% and the life-long risk of developing AA is estimated to be nearly 1.7%.1 The clinical presentation of AA can be as one or multiple patches of hair loss on the scalp or, much rarer, as complete baldness (alopecia totalis) or total loss of body hair (alopecia universalis).2 Disease severity is assessed by using the Severity of Alopecia Tool (SALT) scores.3

The etiopathogenesis of AA has not been fully clarified yet. In their study, Petukhova et al. showed that genetic background has a role in the pathogenesis.4 In addition to genetic background, environmental and immune factors are considered to have a role.5,6 There is growing evidence that it is a polygenic autoimmune disease. Earlier studies have demonstrated a relationship between AA and HLA alleles, some DQB and DR alleles, and Interleukin (IL)-1 cluster genes.6

In the treatment of severe AA, there is a limited response to traditional approaches, and the search for effective treatment is ongoing. Treatments that target different immune system pathways are being introduced as new therapeutic options.7 Case reports, case series, and open-label studies on the use of Tofacitinib, a Janus kinase (JAK) 1 and 3 inhibitors, have been published in recent years.8 Previous studies showed that interleukins especially IL-2, IL-4, and IL-15 may have a role in the pathogenesis of AA. Current studies also mention IL-17 as a potential pro-inflammatory cytokine having a role in the disease mechanism. Tofacitinib is JAK inhibitor that interferes with JAK1 and JAK3. JAK3 interacts with the cytokine receptor, the cyc, which is specifically used for some interleukin receptors including IL-2, IL-4, IL15.9 Also, tofacitinib inhibits Th17 cells that produce IL-17.10

The present study aimed to determine the serum levels of interleukins (IL-2, IL-4, IL-15, and IL-17), which are likely to play a role in the pathogenesis in patients diagnosed with AA. In comparison to previous studies, the relationship of interleukin levels with the duration and severity (SALT score) of AA and the response to tofacitinib therapy was also investigated.

Methods

Patients aged ≥16 years old, who had been clinically diagnosed with AA between 01.09.2019 and 01.06.2020 at the study’s faculty were enrolled in the study. Some patients had hair loss in their bodies in addition to hair loss in the scalp. Patients with acute or chronic critical illnesses that may hinder the study, who are pregnant or in lactation period, receiving any drugs that may interfere with interleukin levels, and those who had received any treatment including topical therapy for AA in the last 2 months were excluded. Acute or chronic critical illnesses include any organ dysfunction or presence of an infection that needs to be treated or followed. The control group consisted of healthy individuals without any acute or chronic disease. They were willing to take part in the research and recruited from public domains. Approval of the Ethics Committee (IUC Date and nº 07/08/2019-121094) and informed consents of all participants were obtained before the study.

Demographic and clinical information of the patients were inquired. Baseline serum IL levels of the patients and the controls were measured. In the patient group receiving tofacitinib therapy, serum IL levels were measured again after 6 months of treatment. Patients with AA who were resistant to topical therapy were started to tofacitinib therapy after taking their informed consents. Before starting the treatment with tofacitinib, hemogram, liver function tests, kidney function tests, amylase, lipase levels, viral serology, quantiferon test, and chest-X-Ray were asked from all patients. Blood tests were repeated every month and patients were followed in the study’s clinic. The daily dose of tofacitinib was 10 mg/day.

Disease severity for AA was assessed using the SALT. In the SALT scoring system, the scalp is divided into 4 areas; vertex corresponds to 40%, right profile corresponds to 18%, left profile corresponds to 18% and occipital region corresponds to 24% of the scalp surface area. After determining the percentage of hair loss in these 4 regions, it is multiplied by the percentage value that corresponds to the relevant area, and then the SALT score is obtained as the sum of the scores obtained from each of the 4 areas. Higher scores indicate severe disease; total hair loss on the scalp corresponds to 100 points.3

Peripheral blood samples taken from the patients and the controls to analyze serum interleukin levels were centrifuged at 3000 rpm for 10 minutes, and then the serum was separated and stored at −30 °C until the time of analysis. Serum IL-2, IL-4, IL-15, and IL-17 levels were measured by the ELISA method. The values were presented as ng/L.

Statistical analysis

Data were analyzed using the PASW Statistics for Windows, Version 18.0 (SPSS Inc., Chicago, IL, USA). The suitability of variables to normal distribution was analyzed by visual (histogram and probability graphics) and analytic methods (Kolmogorov-Smirnov/Shapiro-Wilk tests). Descriptive statistics were presented as numbers and percentages for categorical variables and as median, percentile 25 (Q1) and percentile 75 (Q3) for numerical variables. For categorical variables, paired group comparison was performed using the Chi-Square test. As normal distribution condition was not provided, the Mann-Whitney U test was used in paired group comparison for numerical variables. Pre-post analyses for each group were performed using the Wilcoxon Signed Rank test. The relationship between numerical variables was analyzed by Spearman’s rho test. The situations where type 1 error was below 5% were interpreted as statistically significant.

Results

The study included 61 AA patients and 30 healthy volunteers as the control group. The patient group and the control group were comparable in terms of age and sex (Table 1). The mean disease duration for AA was 7 ± 6 years and the baseline mean SALT score was 71 ± 30 (range, 20–100). Tofacitinib treatment was used in 52.5% of the patients. In the remaining group, 36.1% of patients were started other treatments including topical immunotherapy and systemic steroid treatment.

Table 1.

General characteristics of alopecia areata patients and the controls.

  Patient group (n = 61)  Control group (n = 30) 
Age, years  30 ± 10  30 ± 7  0.493 
  28 (20–38)  29.5 (25–34)   
Sex       
Male  30 (49.2)  15 (50.0)  0.941
Female  31 (50.8)  15 (50.0) 
Disease duration, years  7 ± 6 5 (3–10)  –  – 
SALT score  71 ± 30 80 (40–100)  –  – 
Treatment       
Tofacitinib  32 (52.5)  –  – 
SADBE  17 (27.9)  –  – 
Steroid  4 (6.6)  –  – 
DPCP  1 (1.6)  –  – 
None  7 (11.5)  –  – 

The values are presented as number (%) or mean ± standard deviation, and median (Q1–Q3).

DPCP, Diphenylcyclopropenone; SADBE, Squaric Acid Dibutylester; SALT, Severity of Alopecia Tool.

Serum IL concentrations of the patients and the control group are demonstrated in Table 2. Baseline IL-2, IL-4, and IL-15 levels were significantly higher in the patient group as compared to those of the control group.

Table 2.

Baseline interleukin levels of the patient and control groups.

Interleukins, ng/LPatient group (n = 61)  Control group (n = 30)  p
Mean ± SD  Mean ± SD 
Median (Q1–Q3)  Median (Q1–Q3) 
IL-2709 ± 747  308 ± 150  < 0.001
359.53 (306.34–709.42)  285.63 (216.03–344.66) 
IL-4544 ± 439  183 ± 110  < 0.001
324.99 (273.87–648.9)  150.08 (99.1716–251.26) 
IL-15485 ± 636  168 ± 184  < 0.001
195.1 (136.39–496.33)  134.66 (65.46–170.49) 
IL-17158 ± 189  109 ± 69  0.723
80.66 (60.27–162.38)  83.56 (56.69–171.12) 

IL, Interleukin; SD, Standard Deviation.

IL levels were analyzed according to the genders in the patient group and the control group. No significant difference was determined between males and females in terms of IL levels both in the patient and control groups (Table 3).

Table 3.

Interleukin levels according to the sex.

nMale  nFemale  p
Mean ± SD  Mean ± SD 
Median (Q1–Q3)  Median (Q1–Q3) 
Control Group           
IL-215297 ± 137  15319 ± 166  0.724
292.72 (189–361.58)  284 (224.42–327.89) 
IL-415201 ± 133  15166 ± 82  0.663
149.30 (99.17–254.26)  150.86 (87.64–251.26) 
IL-1515225 ± 244  15110 ± 60  0.178
151.39 (80.31–294.1)  118.69 (48–144.1) 
IL-1715101 ± 52  15117 ± 83  0.820
73.54 (61.04–170.59)  99.81 (45.08–202.42) 
Patient Group           
IL-230742 ± 662  31678 ± 831  0.260
378.24 (314.86–911.03)  348.47 (290.95–462.66) 
IL-430605 ± 463  31486 ± 413  0.337
344.15 (276.71–1146.33)  303.53 (262.56–536.01) 
IL-1530504 ± 631  31467 ± 651  0.937
193.78 (130.28–590.95)  200.42 (139.63–446.04) 
IL-1730148 ± 152  31168 ± 222  0.920
85.03 (57.33–192.49)  78.97 (62.49–124.5) 

IL, Interleukin; SD, Standard Deviation.

No statistically significant correlation was found between baseline IL levels and either disease duration or disease severity (baseline SALT score) (Table 4).

Table 4.

Correlation between baseline interleukin levels and disease duration and disease severity (Severity of Alopecia Tool score).

Baseline IL levelsBaseline SALT scoreDisease duration
rho  rho 
IL-2  61  0.070  0.593  61  0.072  0.579 
IL-4  61  -0.117  0.370  61  0.104  0.427 
IL-15  61  -0.109  0.404  61  0.059  0.650 
IL-17  61  -0.073  0.576  61  0.149  0.253 

IL, Interleukin; SALT, Severity of Alopecia Tool.

There were 32 patients receiving tofacitinib. Pre- and post-treatment IL levels and SALT scores were compared in 22 of these patients, in whom the measurements were repeated at the 6th month. A significant decrease was found in all IL levels after treatment when compared to those before treatment (baseline). Additionally, a significant decrease was observed in disease severity assessed by SALT score (Table 5).

Table 5.

Interleukin levels and Severity of Alopecia Tool scores in the patients receiving tofacitinib treatment.

Pre-treatment (n = 22)  Post-treatment (n = 22)  p
Median (Q1–Q3)  Median (Q1–Q3) 
SALT score  100 (50–100)  40 (24–50)  < 0.001 
IL level       
IL-2  346.92 (314.08–462.66)  248.96 (174.55–298.89)  < 0.001 
IL-4  317.16 (276.71–504.72)  152.0 (128.08–290.31)  0.022 
IL-15  208.86 (125.64–490.64)  122.82 (68.36–200.4)  0.033 
IL-17  88.69 (64.88–107.74)  49.32 (38.77–82.34)  0.016 

IL, Interleukin; SALT, Severity of Alopecia Tool.

There was no significant relationship between the change in IL levels and the change in the SALT scores after treatment in comparison to that before treatment in the patients receiving tofacitinib (Table 6).

Table 6.

Relationship between the change in interleukin levels and the change in Severity of Alopecia Tool scores in the patients receiving tofacitinib treatment.

  Difference in SALT Scores (Post–Pre)
  rho 
Difference in IL-2 (Post-Pre)  22  0.199  0.376 
Difference in IL-4 (Post–Pre)  22  -0.296  0.180 
Difference in IL-15 (PostPre)  22  -0.169  0.452 
Difference in IL-17 (Post–Pre)  22  -0.137  0.545 

IL, Interleukin; SALT, Severity of Alopecia Tool.

Discussion

Depending on disease severity, the psychosocial status of AA patients is influenced, and their quality of life is impaired.11 The absence of a curative treatment for this disease leads to the continuation of the search for efficient treatment and studies to illuminate the pathogenesis. It is thought that immunological mechanisms are effective in the pathogenesis of AA and that various cytokines such as Interferon (IFN), Tumor Necrotizing Factor (TNF), and interleukins as well play a role.12,13

There is a limited number of clinical studies investigating the relationship of interleukins with disease severity and its role in the pathogenesis of AA. In the present study, the authors evaluated the levels of IL-2, IL-4, IL-15, and IL-17. Baseline IL-2, IL-4, and IL-15 levels were significantly higher in the patient group than those in the control group (p < 0.001 for each). No significant correlation was found between the baseline interleukin levels and either disease duration or disease severity. There was no statistically significant difference between IL-17 levels of the patient and control group and no significant correlation between IL-17 levels and duration or severity of AA.

IL-2 is a cytokine playing a role in immune memory with a proven relationship with autoimmune conditions, and the use of IL-2 or its receptors in immunotherapy is debatable.14 Kasumagić-Halilovic et al.15 found higher IL-2 levels in AA patients as compared to that of the controls. No correlation was found between IL-2 levels and clinical type of AA or disease duration. Likewise, the authors also found higher IL-2 levels in AA patients than that in the controls. The authors found no significant correlation between IL-2 levels and duration or severity of AA.

IL-4 is an interleukin that takes part in various physiological and pathological processes and plays a role in tissue adhesion and inflammation.16 Kalkan et al.17 concluded that IL-4 VNTR polymorphism might be a risk factor for the development of AA. In the present study, IL-4 levels were higher in AA patients when compared to that of the controls (p < 0.001). There was no significant correlation between IL-4 levels and duration or severity of AA.

IL-15 is a multifunctional cytokine with a documented relationship with autoimmune diseases.18 Ebrahim et al.19 reported higher serum IL-15 levels in AA patients as compared to the controls and a significantly positive correlation between SALT scores and IL-15 levels. They concluded that IL-15 might be a marker of AA severity. In the present study, likewise, IL-15 levels were higher in AA patients in comparison to that of the controls (p < 0.001). However, no significant correlation was found between IL-15 levels and duration or severity of AA.

IL-17 is a cytokine that plays a critical role in the epithelial barrier of the body parts that are frequently exposed to microorganisms, as well as in immunopathology, host defense, and inflammation.20 El-Morsy et al.21 determined higher serum IL-17A levels in AA patients as compared to the controls; nevertheless, they reported the absence of a significant correlation between IL-17A levels and gender, disease duration, SALT score or disease severity. Based on these findings, they concluded that IL-17A potentially plays a role in the pathogenesis but does not affect disease severity. In another study, no difference was found between IL-17A levels of AA patients and of the controls; however, patients’ IL-17A levels showed a significant decrease after Narrowband-Ultraviolet B treatment.22 Loh et al.23 reported higher serum IL-17 levels in AA patients as compared to the controls in their study. In their review, Ramot et al.24 concluded that there is no clear relationship between IL-17 levels and disease severity or duration despite higher IL-17 levels reported in AA patients. In the present study, although IL-17 level was higher in AA patients than the controls, the difference was not statistically significant. Furthermore, there was no significant correlation between IL-17 levels and duration or severity of AA.

Drug selection for the treatment of AA depends on numerous factors such as patient’s age, extensiveness/duration of the disease, patient’s expectation, treatment cost, and presence of comorbidity. Although there is no curative treatment yet, various therapies are being implemented to provide remission. Corticosteroids, topical minoxidil, topical immunotherapy (DPCP, SADBE), anthralin, phototherapy, immunosuppressive agents, prostaglandin analogs, biologics, and JAK inhibitors are among the therapies that are currently being implemented and considered beneficial.25 Recently, along with increasing information on the pathogenesis and the introduction of the role of the JAK pathway, the therapeutic potential of JAK inhibitors (tofacitinib, ruxolitinib and baricitinib) in AA began to attract attention.26 Beneficial effects of tofacitinib in the treatment of moderate-severe AA have been reported in case series and clinical studies.27–31 Guo et al.32 carried out a systematic review and a meta-analysis and reported that tofacitinib is beneficial in the treatment of AA patients and causes only mild adverse events, and they recommended verification of these data in future randomized, large-scale clinical trials. In the present study, interleukin levels were re-studied, and the SALT score was re-measured at the 6th month of treatment in 22 of the AA patients receiving tofacitinib. While the patients’ median (Q1–Q3) SALT score was 100 (50–100) at baseline, it became 40 (24–50) at the 6th month of tofacitinib therapy. This decrease in disease severity was found statistically significant (p < 0.001). The interleukin levels of the patients studied in the present study demonstrated significant reduction with tofacitinib therapy.

In conclusion, high interleukin levels in AA patients and the significant decrease with treatment support the idea that interleukins have a role in pathogenesis. Nevertheless, no relationship could be demonstrated between IL levels and disease duration or severity. Further studies with larger patient populations are required. Understanding the role of interleukins in pathogenesis will make a contribution to the development of new targeted therapies.

Conclusion

High interleukin levels in alopecia areata patients and the significant decrease following tofacitinib treatment support the idea that interleukins have a role in the pathogenesis of AA. Further studies are needed to investigate the role of interleukins in the pathogenesis of AA.

Financial support

None declared.

Authors' contributions

Özge aşkın: Approval of the final version of the manuscript; critical literature review; data collection, analysis and interpretation; effective participation in research orientation; ıntellectual participation in propaedeutic and/or therapeutic management of studied cases; manuscript critical review; preparation and writing of the manuscript; statistical analysis; study conception and planning.

Sera Nur Yücesoy: Approval of the final version of the manuscript; critical literature review; data collection, analysis and interpretation; effective participation in research orientation; ıntellectual participation in propaedeutic and/or therapeutic management of studied cases; manuscript critical review; preparation and writing of the manuscript.

Erkam Coşkun: Approval of the final version of the manuscript; critical literature review; data collection, analysis and interpretation; effective participation in research orientation.

Burhan Engin: Approval of the final version of the manuscript; critical literature review; data collection, analysis and interpretation; effective participation in research orientation.

Server Serdaroğlu: Approval of the final version of the manuscript; critical literature review; data collection, analysis and interpretation; effective participation in research orientation; ıntellectual participation in propaedeutic and/or therapeutic management of studied cases; manuscript critical review; preparation and writing of the manuscript.

Conflicts of interest

None declared.

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How to cite this article: Aşkın Ö, Yücesoy SN, Coşkun E, Engin B, Serdaroğlu S. Evaluation of the level of serum Interleukins (IL-2, IL-4, IL-15 andIL-17) and its relationship with disease severity in patients with alopecia areata. An Bras Dermatol. 2021;96:551–7.

Study conducted at the Istanbul University Cerrahpasa, Istanbul, Turkey.

Copyright © 2021. Sociedade Brasileira de Dermatologia
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