Interaction of Companilactobacillus crustorum MN047-derived bacteriocins with gut microbiota

Companilactobacillus crustorum MN047-derived bacteriocins (CCDB) have inhibitory effects on the growth of pathogens. In this study, a pectin/zein beads delivery system was used to investigate the effects of CCDB on the dextran sulfate sodium-induced colitis in mice. The focus was given on aspects linked with the gut microbiota, intestinal epithelial barrier, oxidative stress, and inflammation. Results suggested that CCDB alleviated the pathological symptoms of colitis, including increased disease activity index and shortened colon length. CCDB strengthened the gut barrier by increasing goblet cells and promoting the expressions of MUC2 and tight junctions-related proteins. CCDB decreased oxidative mediators and increased antioxidant mediators in serum or colon tissue. Furthermore, CCDB reduced harmful bacteria and enriched beneficial bacteria, which further decreased serum LPS and increased fecal butyric acid. In addition, CCDB inhibited the overexpressions of proinflammatory cytokines, chemokines, and pathogens/LPS-activated TLR4/NF-κB pathway. Therefore, CCDB is a potential dietary supplement to relieve colitis.