Microbiota-activated PPAR-γ signaling inhibits dysbiotic Enterobacteriaceae expansion.

Microbiota-activated PPAR-γ signaling inhibits dysbiotic Enterobacteriaceae expansion.
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DOI:
10.1126/science.aam9949
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发表时间:
2017-08-11
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Bäumler AJ
Bäumler AJ
中科院分区:
其他
文献类型:
--
作者:
Byndloss MX;Olsan EE;Rivera-Chávez F;Tiffany CR;Cevallos SA;Lokken KL;Torres TP;Byndloss AJ;Faber F;Gao Y;Litvak Y;Lopez CA;Xu G;Napoli E;Giulivi C;Tsolis RM;Revzin A;Lebrilla CB;Bäumler AJ

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Perturbation of the gut-associated microbial community may underlie many human illnesses, but the mechanisms that maintain homeostasis are poorly understood. We found depletion of butyrate-producing microbes by antibiotic treatment reduced epithelial signaling through the intracellular butyrate sensor PPAR-γ. Nitrate levels increased in the colonic lumen because epithelial expression of Nos2, the gene encoding inducible nitric oxide synthase (iNOS) was elevated in the absence of PPAR-γ-signaling. Microbiota-induced PPAR-γ-signaling also limits the luminal bioavailability of oxygen by driving the energy metabolism of colonic epithelial cells (colonocytes) towards β-oxidation. Therefore, microbiota-activated PPAR-γ-signaling is a homeostatic pathway that prevents a dysbiotic expansion of potentially pathogenic Escherichia and Salmonella by reducing the bioavailability of respiratory electron acceptors to Enterobacteriaceae in the lumen of the colon.
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