Hair Regrowth in Alopecia Areata and Re-Pigmentation in Vitiligo in Response to Treatment: Commonalities and Differences

September 2024 in “ Journal of the European Academy of Dermatology and Venereology ”

Hiroki L. Yamaguchi, Yuji Yamaguchi, Elena Peeva

alopecia areata vitiligo interferon-γ interleukin-15 cytotoxic CD8+ T lymphocytes corticosteroids JAK inhibitors hair follicle stem cells melanocyte stem cells

TLDR Hair regrows faster in alopecia areata than skin re-pigments in vitiligo due to differences in stem cells and treatment effects.

The document discusses the shared pathogenesis of alopecia areata (AA) and vitiligo, focusing on the interferon-γ and interleukin-15 signaling pathways that activate cytotoxic CD8+ T lymphocytes. Both conditions respond to treatments like corticosteroids and JAK inhibitors, though hair regrowth in AA is faster than re-pigmentation in vitiligo. The review highlights the roles of hair follicle stem cells and melanocyte stem cells in hair and skin recovery, respectively. It proposes four hypotheses for the slower melanin distribution in vitiligo, including differences in stem cell abundance, travel distance, scaffold preservation, and the effects of JAK inhibitors. The review aims to connect scientific advancements with clinical practices for managing AA and vitiligo.

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