Modulating the Butyrophilin-Like Protein 2 Pathway Prevents Alopecia Areata in C3H/HeJ Mice

This study explores the role of butyrophilin-like protein 2 (BTNL2) in preventing alopecia areata (AA), an autoimmune disease affecting hair follicles. Researchers expressed a soluble mouse BTNL2-Fc fusion protein and found that it inhibited the proliferation of CD4+ and CD8+ T cells in vitro. In vivo experiments showed that administering BTNL2-Fc prevented AA development in C3H/HeJ mice with skin grafts. The treatment specifically inhibited the generation and proliferation of alopecic NKG2D+CD8+ T cells. These findings suggest that the BTNL2 pathway could be a promising therapeutic target for AA.