期刊
BIOMED RESEARCH INTERNATIONAL
卷 2021, 期 -, 页码 -出版社
HINDAWI LTD
DOI: 10.1155/2021/4192451
关键词
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资金
- National Natural Science Foundation of China [81700487, 81871905]
- Natural Science Foundation of Guangdong Province [2018A030310672]
- China Postdoctoral Science Foundation [2019M652978]
- Guangdong Medical Science and Technology Research Fund [A2019243]
- Innovative Clinical Technique of Guangzhou [2019GX05]
In this study, the relationship between PD-1 inhibition, gut microbiota, and IBD was investigated using a mouse model of experimental colitis. The results demonstrated that PD-1 inhibition attenuated colitis symptoms, improved the diversity of the enteric microbiome, and enriched the abundance of SCFA-producing bacteria.
Background and Aim. The enteric microbiota is able to cross-talk with factors involved in the blockade of programmed cell death protein 1 (PD-1) and also plays an important role in the predisposition and onset of inflammatory bowel disease (IBD). The current study used a mouse model of experimental colitis to determine the pathogenic connection between PD-1 inhibition, gut microbiota, and IBD. Methods. Colitis was induced in mice using 2,4,6-trinitrobenzene-sulfonic acid (TNBS), and mice were subsequently treated with either a PD-1 inhibitor or 5-amino-salicylic acid (ASA) as a positive control. Body weight, disease activity index (DAI), colon length, and tissue damage were evaluated, and the enteric microbiota was profiled using high-throughput 16S rRNA sequencing of fecal samples from the experimental mice. Results. TNBS caused mice to experience IBD-like symptoms, which were attenuated by the PD-1 inhibitor, as indicated by a decrease in DAI scores (p=0.0002). Furthermore, in this mouse model of IBD, PD-1 inhibition improved the alpha diversity as well as restored the beta diversity of the enteric microbiome. It also significantly enriched the abundance of short-chain fatty acid- (SCFA-) producing bacteria of the Firmicutes (p<0.05) and Bacteroidetes (p<0.05) phyla but depopulated Proteobacteria (p<0.05). Conclusion. PD-1 inhibition can partly mitigate TNBS-induced colitis and restore the enteric microbiota by enriching the abundance of SCFA-producing bacteria.
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