Gpr109a Limits Microbiota-Induced IL-23 Production To Constrain ILC3-Mediated Colonic Inflammation.
J Immunol
; 200(8): 2905-2914, 2018 04 15.
Article
em En
| MEDLINE
| ID: mdl-29514953
ABSTRACT
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 regulatory T cells. In this study, 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 (ILCs; ILC3). Genetic deletion of Rorγt alleviated 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 ceca of Gpr109a-/-Rag1-/- mice showed significantly increased colonization by members of Bacteroidaceae, Porphyromonadaceae, Prevotellaceae, Streptococcaceae, Christensenellaceae, and Mogibacteriaceae, as well as IBD-associated microbiota such as Enterobacteriaceae and Mycoplasmataceae, compared with 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 present a model suggesting that targeting Gpr109a will be potentially beneficial in the suppression of IL-23-mediated immunopathologies.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Linfócitos
/
Colite
/
Receptores Acoplados a Proteínas G
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Interleucina-23
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Microbioma Gastrointestinal
Limite:
Animals
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article