Beyond Immunity: TEC and JAK3 Kinase Activation in Melanocytes Drives Inflammation in Vitiligo

The study investigates the role of JAK/STAT and TEC family kinase signaling pathways in vitiligo, focusing on their impact on melanocytes. It reveals that type-1 immune-related cytokines increase the expression of JAK3 and RLK/TXK in melanocytes, and similar effects are observed with the secretome of activated vitiligo skin T cells. Immunofluorescence analyses show increased expression of TEC, ITK, and RLK/TXK in melanocytes from perilesional vitiligo skin compared to healthy skin. The JAK3/TEC inhibitor ritlecitinib reduces inflammatory chemokine production in melanocytes without affecting their viability. These findings suggest that TEC kinases have a direct regulatory role in the epidermal inflammatory response in vitiligo, supporting their potential as therapeutic targets.