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Learn MoreFoxp3+ regulatory T (Treg) cells are essential for immunological tolerance and homeostasis. In peripheral tissues, Treg cells acquire enhanced suppressive functions and co-opt distinct transcriptional modules, allowing context and tissue-dependent immune regulation. Here we show that the transcription factor c-Maf was highly expressed by effector Treg cells and controlled their IL-10 production. In the intestine, c-Maf was required for the differentiation of RORgt+ microbiota-dependent Treg cells, and restricted their production of inflammatory cytokines. Consequently, Treg cell-specific loss of c-Maf resulted in perturbed intestinal homeostasis, microbial dysbiosis and a selective failure to control Th17 responses during homeostasis and upon chemically induced epithelial damage. Molecular profiling revealed that c-Maf regulated expression of key genes of the transcriptional signature of intestinal Treg cells, including Rorc and Il10. Thus, our study identifies a key role of c-Maf in preserving the identity and function of intestinal Treg cells, essential for the control of intestinal immune homeostasis. SOURCE: Wei Shi (shi@wehi.edu.au) - The Walter and Eliza Hall Institute of Medical Research
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