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Lrig1 marks a distinct population of stem cells restricted to the upper pilosebaceous unit in normal epidermis. Here we report that IL-17A-mediated activation of EGFR plays a critical role in the expansion and migration of Lrig1 + stem cells and their progenies in response to wounding, thereby promoting wound healing and skin tumorigenesis. Lrig1-specific deletion of the IL-17R adaptor Act1 or EGFR in mice impairs wound healing and reduces tumor formation. Mechanistically, IL-17R recruits EGFR for IL-17A-mediated signaling in Lrig1 + stem cells. While TRAF4, enriched in Lrig1 + stem cells, tethers IL-17RA and EGFR, Act1 recruits c-Src for IL-17A-induced EGFR transactivation and downstream activation of ERK5, which promotes the expansion and migration of Lrig1 + stem cells. This study demonstrates that IL-17A activates the IL-17R-EGFR axis in Lrig1 + stem cells linking wound healing to tumorigenesis.

IL-17R–EGFR axis links wound healing to tumorigenesis in Lrig1+ stem cells