Gene Array Profiling and Immunomodulation Studies Define a Cell-Mediated Immune Response Underlying the Pathogenesis of Alopecia Areata in a Mouse Model and Humans

The study explored the pathogenesis of alopecia areata (AA) using a mouse model and human samples, identifying a cell-mediated immune response as a crucial factor. In C3H/HeJ mice, AA was induced through skin grafts, and gene expression analysis revealed 42 genes involved in early disease onset and 114 in later stages, indicating an inflammatory process. In humans, 95 genes were significantly modulated. Lymphocytes were confirmed as primary effector cells, and blocking T cell activation could prevent disease onset in mice. The study suggested that targeting immune cells might be effective in treating AA, highlighting the autoimmune nature of the disease and potential therapeutic targets.