Coprococcus eutactus , a Potent Probiotic, Alleviates Colitis via Acetate-Mediated IgA Response and Microbiota Restoration.

Inflammatory bowel disease (IBD) is a complex disease characterized by relapsing episodes of inflammation of the colonic mucosa. Research into IBD suggests that this disease condition is caused by alterations in resident mucosal bacterial populations. Our previous study showed that was significantly elevated during the improvement of IBD. Human metagenome database GMrepo also indicates , in particular, (), which was negatively associated with IBD. The current study implied the alleviated effects and mechanisms of on dextran sodium sulfate-induced experimental colitis mice. Gavage with -ameliorated acute colitis, as evidenced, relieved weight loss, decreased concentrations of proinflammatory cytokines TNF-α, IL-1β, and IL-6, and increased anti-inflammatory factors, IL-4, IL-5, and IL-10. In addition, enhanced the maturation of goblet cells and the expressions of mucins and restored the expressions of tight junction proteins such as claudin-1, occludin, and ZO-1. As a short-chain fatty acid-producing bacterium, mainly generates acetic acid. Interestingly, not only high levels of secretory immunoglobulin A (SIgA) but also increased IgA-producing plasma cells were observed in colitis mice during the administration of . Importantly, our data demonstrated that colonic SIgA is specifically coated on pathogens of . Owing to the selective binding effect of SIgA on microorganisms, the microbial diversity in the intestinal lumen and mucosa of -treated colitis mice was significantly restored, and the microbiota structure was remodeled. These findings provide substantial insight that as a promising probiotic can ameliorate colitis. In conclusion, our findings may deliver a novel approach to the prevention and biotherapy of IBD.