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Probiotics and Probiotic Metabolic Product Improved Intestinal Function and Ameliorated LPS-Induced Injury in Rats.

Current Microbiology 2017 November
In the present study, we sought to determine the effects of Bacillus subtilis (BAS) and Bacillus licheniformis (BAL) in rats after lipopolysaccharide (LPS)-induced acute intestinal inflammation. We also determined whether the B. subtilis metabolic product (BASM) is as effective as the live-cell probiotic. 60 male SD rats were randomly assigned to five groups and administered a diet containing 0.05% B. licheniformis (BAL group), 0.05% B. subtilis (BAS group), 0.5% B. subtilis metabolic product (BASM group), or a basic diet (PC group and NC group) for 40 days. On day 40, BAL, BAS, BASM, and NC groups were injected with 4 mg/kg body weight LPS. 4 h later, all rats were anesthetized and sacrificed. The results showed that the administration of B. licheniformis and B. subtilis improved intestinal function as evidenced by histology, increased enzyme activity, and mucosal thickness. They also increased the number of intraepithelial lymphocytes and decreased mucosal myeloperoxidase activity and plasma TNF-α. In addition, the cecal content of B. subtilis-treated rats had significantly increased microbial diversity, decreased numbers of Firmicutes, and increased numbers of Bacteroidetes as compared to rats fed basic diets. Similar to BAS group, the cecal content of B. licheniformis-treated rats decreased the number of Firmicutes. Administration of B. subtilis metabolic product had similar effects on intestinal function, inflammation response, and microbial diversity as B. subtilis but these effects were attenuated. In conclusion, administration of probiotic strains B. licheniformis or B. subtilis improved intestinal function, ameliorated the inflammation response, and modulated microflora after LPS-induced acute inflammation in rats. Non-living cells also exerted probiotic properties but live cells tended to function better.

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