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Elucidating the role of T-Reg related cytokines: serum transforming growth factor beta and interleukin-35 in alopecia areata

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Abstract

Previous studies demonstrated that Th1 cytokines like IL-2, IL-12 and IFN-γ have initiatory role in alopecia areata (AA) and positive correlation with disease severity. They informed that serum levels of Th17 cytokines, IL-17, IL-22, IL-23 increased in active AA patients and corelated, particularly IL-17, with disease severity. In recent reports it was showed the balance between Th17 and Treg cells is crucial for maintaining tolerance to self-antigens, and an imbalance towards Th17 may contribute to the development of autoimmune diseases like AA. But research on serum Treg markers in AA is limited. It was aimed to investigate whether the Treg cells have a role in the pathogenesis of AA analyzing the serum levels of Treg cytokines IL-35 and TGF-β in the patients with AA. 42 AA patients and 38 healthy controls were enrolled. Patient demographics, clinical data, disease severity assessed by Severity of Alopecia Tool (SALT) scores were recorded. Serum samples were collected and analyzed for TGF-β and IL-35 levels using ELISA kits. The cytokine levels in both groups were statistically compared. Their relation with parameters of demographic and severity of disease was evaluated. The patient and control groups had no statistically significant difference, there was 71.4% males and 28.6% females in patient group, while the control group had 63.2% males and 36.8% females, Severity analysis classified 18 patients with mild AA, 19 with moderate AA, and 5 with alopecia totalis/areata universalis. While TGF-β levels exhibited no significant difference between groups, IL-35 levels were significantly elevated in AA patients (p = 0.002). Logistic regression identified IL-35 as a significant parameter influencing disease status (OR = 1.055). Correlation analysis revealed a weak positive correlation between patient age and IL-35 levels (r = 0.436; p = 0.004). Notably, IL-35 levels displayed a significant decrease in individuals with antinuclear antibody (ANA) positivity. No correlations were identified between cytokine levels and disease severity, prognosis, or disease activity. Elevated IL-35 levels suggest that IL-35 and specific Treg cell subsets can play a role in AA pathogenesis. The nuanced roles of TGF-β and IL-35 highlight the need for comprehensive studies to interpret their implications in the complex immunopathogenesis of AA. These findings open avenues for further research, positioning IL-35 as a prospective target for investigating and potentially intervening in AA pathogenesis.

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No datasets were generated or analysed during the current study.

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Authors and Affiliations

  1. Department of Dermatology, Girne Dr. Akcicek State Hosiptal, Kyrenia, Cyprus

    Tugcan Yuksek

  2. Ankara Etlik City Hospital Department of Dermatology and Venereology, Health Sciences University, Ankara, Turkey

    Muzeyyen Gonul & Selda Pelin Kartal

  3. Ankara Etlik City Hospital, Department of Clinic Biochemistry, Health Sciences University, Ankara, Turkey

    Elif Bengu Gungor & Semra Isikoglu Hatil

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  1. Tugcan Yuksek
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  2. Muzeyyen Gonul
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Contributions

T.Y. collected the participants data, T.Y and M.G. wrote the main manuscript text and prepared the figures, S.P.K took part in statistical analysis and contributed the discussion section of the manuscript, E.B.G and S.I.H performed the biochemical tests. All authors reviewed the manuscript.

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Correspondence to Tugcan Yuksek.

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Yuksek, T., Gonul, M., Kartal, S.P. et al. Elucidating the role of T-Reg related cytokines: serum transforming growth factor beta and interleukin-35 in alopecia areata. Arch Dermatol Res 316, 205 (2024). https://doi.org/10.1007/s00403-024-02901-9

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