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Redundant cytokine requirement for intestinal microbiota-induced Th17 cell differentiation in draining lymph nodes

By Teruyuki Sano, Takahiro Kageyama, Victoria Fang, Ranit Kedmi, Jhimmy Talbot, Alessandra Chen, Reina Kurakake, Yi Yang, Charles Ng, Susan R Schwab, Dan R. Littman

Posted 22 Apr 2020
bioRxiv DOI: 10.1101/2020.04.21.053934

Differentiation of intestinal T helper 17 (Th17) cells, which contribute to mucosal barrier protection from invasive pathogens, is dependent on colonization with distinct commensal bacteria. Segmented filamentous bacteria (SFB) are sufficient to support Th17 cell differentiation in mouse, but the molecular and cellular requirements for this process remain incompletely characterized. Here we show that intestine-draining mesenteric lymph nodes (MLN) are the dominant site of SFB-induced intestinal Th17 cell differentiation. Subsequent migration of these cells to the intestinal lamina propria is dependent on their up-regulation of integrin β7. Stat3-dependent induction of RORγt, the Th17 cell-specifying transcription factor, largely depends on IL-6, but signaling through the receptors for IL-21 and IL-23 can compensate for absence of IL-6 to promote SFB-directed Th17 cell differentiation. These results indicate that redundant cytokine signals guide commensal microbe-dependent Th17 cell differentiation in the MLN and accumulation of the cells in the lamina propria. ### Competing Interest Statement The authors have declared no competing interest.

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