Journal
MOLECULAR NUTRITION & FOOD RESEARCH
Volume 64, Issue 5, Pages -Publisher
WILEY
DOI: 10.1002/mnfr.201900655
Keywords
intestinal epithelial; intestinal stem cells; Lactobacillus; proliferation; S; typhimurium
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Funding
- National Key RAMP
- D Program of China [2018YFE0127300]
- Fundamental Research Funds for the Central Universities [JCQY201906]
- National Natural Science Foundation of China [31972631, 31502024]
- PAPD
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Scope The influence of the intestinal microbiota, such as Lactobacillus, on the intestinal mucosa, particularly intestinal stem cells, remains incompletely understood. In this study, mice and intestinal organoids are used to explore the regulatory effect of Lactobacillus on the proliferation and differentiation of intestinal epithelial cells. Methods and results This study demonstrates that S. typhimurium causes intestinal epithelial damage and affected growth of intestinal organoids. S. typhimurium also colonizes the intestine and then causes pathological changes to the intestinal epithelium, intestinal inflammation, and even death. However, L. acidophilus alleviates damage to intestinal organoids, increases the survival ratio of mice infected with S. typhimurium, and reduces tumor necrosis factor-alpha (TNF-alpha) secretion. Moreover, L. acidophilus affects the differentiation of epithelial cells through inhibition of the excessive expansion of goblet cells and Paneth cells induced by S. typhimurium to avoid over-exhaustion. Finally, it is also demonstrated that L. acidophilus ameliorates overactivation of Wnt/beta-catenin pathway by Salmonella, depending on the contact with toll-like receptor 2 (TLR2), to affect the proliferation of the intestinal epithelium. Conclusions This study demonstrates that L. acidophilus protects the intestinal mucosa against S. typhimurium infection through not only the inhibition of pathogen invasion but also determination of the fate of the intestinal epithelium.
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