Transfer of alopecia areata in the human scalp graft/Prkdcscid (SCID) mouse system is characterized by a TH1 response

Alopecia areata is an autoimmune condition directed at hair follicles, which results in loss of hair. We have previously demonstrated that it is possible to transfer hair loss, along with the immunohistologic findings of alopecia areata, to human scalp grafts on Prkdcscid (SCID) mice by injection of autologous activated lesional T-cells. This study examines the cytokine profile of T-cells and follicular epithelium following transfer of hair loss. Two consistent findings significantly (P < 0.01) associated with hair loss were production of interferon-γ-inducible protein-10kDa (IP-10) by follicular epithelium (13/13), and production of INF-γ by infiltrating T-cells (10/12). Noninjected control grafts regrew hair, and were generally negative for IP-10 (positive 2/9), and INF-γ (positive 2/9), but expressed of IL-10 on the follicular epithelium (7/9). These data support an INF-γ TH1 pathogenesis for hair loss in alopecia areata.