Effect of Bacillus amyloliquefaciens LSG2-8 on the intestinal barrier function of Amur minnow (Rhynchocypris lagowskii)

Probiotics are widely used in aquaculture. This article aims to study the effect of Bacillus amyloliquefaciens LSG2-8 on the intestinal barrier function of Rhynchocypris lagowskii. B. amyloliquefaciens LSG2-8 were added to R. lagowskii basal diets (CK) as additives at four concentrations: 1.0 x 10(6) (D-6), 1.0 x 10(7) (D-7), 1.0 x 10(8) (D-8) and 1.0 x 10(9) (D-9) CFU g(-1) by dry weight of basal diet. After a 56-day feeding experiment, the activities of intestinal digestive enzymes and immunity-related enzymes of R. lagowskii on group D-6, D-7, D-8 and D-9 diet were significantly higher than the control (P < 0.05). In molecular experiments, the authors found that the levels of TGF-beta mRNA, IL-10 mRNA, ZO-1 mRNA and claudin-3 mRNA in group D-8 R. lagowskii were significantly higher (P < 0.05) than those of the control and other groups. Furthermore, the levels of IL-1 beta and IL-8 mRNA of R. lagowskii on group D-6, D-7, D-8 and D-9 diet were significantly lower than those of the control (P < 0.05). In addition, the authors found that B. amyloliquefaciens LSG2-8 can regulate the intestinal flora balance and improve the intestinal structure of R. lagowskii. In conclusion, B. amyloliquefaciens LSG2-8 can improve the intestinal barrier function of R. lagowskii and can be used as a feed additive in aquaculture.

Automated summary

The effect of Bacillus amyloliquefaciens LSG2-8 on the intestinal barrier function of Rhynchocypris lagowskii was studied. It was found that the addition of B. amyloliquefaciens LSG2-8 in the diet of R. lagowskii significantly increased the activities of intestinal digestive enzymes and immunity-related enzymes. Molecular experiments revealed higher levels of TGF-beta mRNA, IL-10 mRNA, ZO-1 mRNA, and claudin-3 mRNA in R. lagowskii treated with B. amyloliquefaciens LSG2-8. Furthermore, B. amyloliquefaciens LSG2-8 was found to regulate the intestinal flora balance and improve the intestinal structure of R. lagowskii.