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Dendritic epidermal T cells (DETCs) are a well-studied population of γδ T cells that play important roles in wound repair. In this study, we characterize a second major population of γδ T cells in the skin that is present in the dermis. In contrast to DETCs, these Vγ5-negative cells are IL-7R(hi)CCR6(hi) retinoic acid-related orphan receptor γt(+) and are precommitted to IL-17 production. Dermal γδ T cells fail to reconstitute following irradiation and bone marrow transplantation unless the mice also receive a transfer of neonatal thymocytes. Real-time intravital imaging of CXCR6(GFP/+) mouse skin reveals dermal γδ T cells migrate at ∼4 μm/min, whereas DETCs are immobile. Like their counterparts in peripheral lymph nodes, dermal γδ T cells rapidly produce IL-17 following exposure to IL-1β plus IL-23. We have characterized a major population of skin γδ T cells and propose that these cells are a key source of IL-17 in the early hours after skin infection.

Cutting Edge: Identification of a Motile IL-17–Producing γδ T Cell Population in the Dermis