The Function of BST2 in Gamma Delta T Cells, CD8 T Cells, and Macrophages in Alopecia Areata Pathogenesis

This study investigates the role of skin γδ T cells and macrophages in the pathogenesis of alopecia areata, an autoimmune disease causing hair loss. The research highlights that epidermal γδ T cells and keratinocytes are elevated in affected mice, and identifies Bone marrow stromal antigen-2 (BST2) as a significantly upregulated gene in epidermal γδ T cells, dermal Cd11b+ macrophages, and CD8 T cells. These cells express antiviral and interferon response genes, with BST2+ macrophages also upregulating complement-associated genes. Immunofluorescence microscopy confirmed increased BST2 expression in these cell types in mice with alopecia areata. Future research will focus on the role of BST2 in disease initiation and the interactions between these immune cells.