Gpr109a Limits Microbiota-Induced IL-23 Production To Constrain ILC3-Mediated Colonic Inflammation.
Gpr109a Limits Microbiota-Induced IL-23 Production To Constrain ILC3-Mediated Colonic Inflammation.
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DOI:
10.4049/jimmunol.1701625
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发表时间:
2018-04-15
期刊:
影响因子:
--
通讯作者:
Singh N
中科院分区:
文献类型:
--
作者:
Bhatt B;Zeng P;Zhu H;Sivaprakasam S;Li S;Xiao H;Dong L;Shiao P;Kolhe R;Patel N;Li H;Levy-Bercowski D;Ganapathy V;Singh N
A set of coordinated interactions between gut microbiota and the immune cells surveilling the intestine play a key role in shaping local immune responses and intestinal health. Gpr109a is a G-protein coupled receptor expressed at a very high level on innate immune cells and previously shown to play a key role in the induction of colonic Tregs. Here we show that Gpr109a−/−Rag1−/− mice exhibit spontaneous rectal prolapse and colonic inflammation, characterized by the presence of an elevated number of IL-17-producing Rorγt+ innate lymphoid cells (ILC3). Genetic deletion of Rorγt ameliorated the spontaneous colonic inflammation in Gpr109a−/−Rag1−/− mice. Gpr109a-deficient colonic dendritic cells produce higher amounts of IL-23, and thereby promote ILC3. Moreover, the depletion of gut microbiota by antibiotics treatment decreased IL-23 production, ILC3, and colonic inflammation in Gpr109a−/−Rag1−/− mice. The caecums of Gpr109a−/−Rag1−/− mice showed significantly increased colonization by members of Bacteroidaceae, Porphyromonadaceae, Prevotellacea, Streptococcaceae, Christensenellaceae, and Mogibacteriaceae as well as IBD-associated microbiota such as Enterobacteriaceae and Mycoplasmataceae than Rag1−/− mice, housed in a facility positive for Helicobacter and murine norovirus. Niacin, a Gpr109a agonist, suppressed both IL-23 production by colonic DCs and ILC3 number in a Gpr109a-dependent manner. Collectively, our data presents a model suggesting that targeting Gpr109a will be potentially beneficial in the suppression of IL-23 mediated immunopathologies.
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