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Th 17 cells have been implicated in the pathogenesis of colitis; however, a cellular mechanism by which colitogenic Th17 immunity arises in vivo remains unclear. In this study, we report that a subset of IL-17(+) γδ T cells plays a crucial role in enhancing in vivo Th17 differentiation and T cell-mediated colitis. TCRβ(-/-) mice were highly susceptible to T cell-mediated colitis, whereas TCRβδ(-/-) mice were resistant to the disease. Importantly, cotransfer of IL-17(+) but not of IL-17(-) γδ T cells with CD4 T cells was sufficient to enhance Th17 differentiation and induce full-blown colitis in TCRβδ(-/-) recipients. Collectively, our results provide a novel function of IL-17(+) γδ T cell subsets in supporting in vivo Th17 differentiation and possibly in fostering the development of intestinal inflammation.

Cutting Edge: Generation of Colitogenic Th17 CD4 T Cells Is Enhanced by IL-17+ γδ T Cells