Interleukin-15 Is a Hair Follicle Immune Privilege Guardian

    April 2024 in “ Journal of Autoimmunity
    Takahiro Suzuki, Jeremy Chéret, FERNANDA DINELLI SCALA, Ali Rajabi‐Estarabadi, Aysun Akhundlu, Dana‐Lee Demetrius, Jennifer Gherardini, Aviad Keren, Matthew Harries, Jose Rodriguez-Feliz, Gorana Kuka Epstein, Wendy Lee, Talveen S. Purba, Amos Gilhar, Ralf Paus
    TLDR Interleukin-15 can help hair growth and protect hair follicles.
    The study investigates the role of interleukin-15 (IL-15) in alopecia areata (AA) pathogenesis, focusing on its impact on hair follicle immune privilege (HF-IP). It reveals that both lesional and non-lesional hair follicles in AA patients show an increased presence of IL-15+ immune cells, suggesting a pathological role. Despite IL-15's known pro-inflammatory effects, the study finds that high concentrations of IL-15 can promote hair growth and prolong the anagen phase in human scalp hair follicles ex vivo. This challenges the notion of IL-15 as a purely pathogenic cytokine in AA and suggests that targeting specific IL-15+ cell subpopulations might be beneficial. The study emphasizes the complexity of IL-15's role in AA and the need for further research to understand its dual effects on hair growth and immune privilege.
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