IgA regulates the composition and metabolic function of gut microbiota by promoting symbiosis between bacteria.

IgA regulates the composition and metabolic function of gut microbiota by promoting symbiosis between bacteria.
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DOI:
10.1084/jem.20180427
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发表时间:
2018-08-06
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Suzuki K
Suzuki K
中科院分区:
其他
文献类型:
--
作者:
Nakajima A;Vogelzang A;Maruya M;Miyajima M;Murata M;Son A;Kuwahara T;Tsuruyama T;Yamada S;Matsuura M;Nakase H;Peterson DA;Fagarasan S;Suzuki K

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IgA regulates the composition and function of gut microbiota. Nakajima et al. show that a heavily glycosylated monoclonal IgA coats B. theta and induces Mucus-Associated Functional Factor in vivo to enhance symbiotic interactions with commensal bacteria to maintain gut homeostasis. Immunoglobulin A (IgA) promotes health by regulating the composition and function of gut microbiota, but the molecular requirements for such homeostatic IgA function remain unknown. We found that a heavily glycosylated monoclonal IgA recognizing ovalbumin coats Bacteroides thetaiotaomicron (B. theta), a prominent gut symbiont of the phylum Bacteroidetes. In vivo, IgA alters the expression of polysaccharide utilization loci (PUL), including a functionally uncharacterized molecular family provisionally named Mucus-Associated Functional Factor (MAFF). In both mice and humans, MAFF is detected predominantly in mucus-resident bacteria, and its expression requires the presence of complex microbiota. Expression of the MAFF system facilitates symbiosis with other members of the phylum Firmicutes and promotes protection from a chemically induced model of colitis. Our data reveal a novel mechanism by which IgA promotes symbiosis and colonic homeostasis.
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