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- REVIEW] Type 3 regulatory T cells at the interface of symbiosis
- Joo-Hong Park , Gérard Eberl
- J. Microbiol. 2018;56(3):163-171. Published online February 28, 2018
- DOI: https://doi.org/10.1007/s12275-018-7565-x
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Abstract
- The mammalian gastrointestinal tract accommodates trillions of bacteria, many of which provide beneficial effects to the host, including protection from pathogenic microorganisms and essential metabolites. However, the intestinal immune system needs to adapt to the constantly fluctuating microbial environment at mucosal surfaces in order to maintain homeostasis. In particular, the gut microbiota induces the differentiation of effector Th17 cells and regulatory T cells (Tregs) that express RORγt, the master regulator of antimicrobial type 3 immunity. RORγt+ Tregs constitute a major population of colonic Tregs that is distinct from thymusderived Tregs and require bacterial antigens for differentiation. The balance between Th17 cells and RORγt+ Tregs, that is, the tone of the local type 3 immune response, is regulated by the vitamin A metabolite retinoic acid produced by the host. Furthermore, Th17 cells and RORγt+ Tregs regulate intestinal type 2 immune responses, explaining how bacteria block allergic reactions. Here, we review the cellular and molecular mechanisms involved in the differentiation, regulation and function of RORγt+ (type 3) Tregs, and discuss the multiple equilibria that exist between effector T cells and Tregs, as well as between different types of immune responses, which are necessary to maintain homeostasis and health.
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