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Mucin pre-cultivated Lactobacillus reuteri E shows enhanced adhesion and increases mucin expression in HT-29 cells

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Abstract

Adhesion of probiotic bacteria to the mucus layer lining the gastrointestinal tract is necessary for its effective colonisation and specific therapeutic effects. Enrichment of growth medium with mucin might stimulate bacterial adhesion, probably by increasing the expression of surface structures responsible for bacteria-gut epithelia and/or mucus interactions. The aim of this study was to determine if pre-cultivation of potentially probiotic strain Lactobacillus reuteri E (LRE) with mucin stimulates its adherence to colon cell line HT-29 and if the increased adhesion modulates mucin expression in these cells. The mucin-producing HT-29 cell line was co-cultivated for 2 h with LRE grown in MRS broth or MRS broth enriched with pig gastric mucin (LRE + M). The adherence ability of LRE was evaluated microscopically and by plate counting. The relative gene expression was measured by qPCR. Pre-cultivation of LRE in mucin enriched medium significantly increased its adhesion to 14 days HT-29 in comparison with LRE by both methods (28.64% vs. 23.83%, evaluated microscopically, and 14.31 ± 3.95 × 106 CFU ml−1 vs. 8.54 ± 0.43 × 106 CFU ml−1, evaluated by plate counting). MUC2, MUC5AC, and IL-10 were significantly upregulated after co-cultivation with LRE + M in comparison to LRE and control group (lactobacilli-free HT-29). Obtained results suggest that pre-cultivation of lactobacilli with mucin may not only stimulate their adhesion abilities but also promote their effectiveness to modulate the pathways involved in the pathophysiology of some diseases, e.g., with defective mucin synthesis in ulcerative colitis or colorectal cancer.

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Acknowledgements

Authors would like to thank Dr. Z. Kozovská (Biomedical Research Center of the Slovak Academy of Sciences, Slovakia) for providing HT-29 cells.

Funding

This work was financially supported by Faculty of Pharmacy, Comenius University in Bratislava (Grant for Young Researchers FaF UK/33/2019).

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All authors contributed to the study conception and design.

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Correspondence to Hana Kiňová Sepová.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Dudík, B., Kiňová Sepová, H., Bilka, F. et al. Mucin pre-cultivated Lactobacillus reuteri E shows enhanced adhesion and increases mucin expression in HT-29 cells. Antonie van Leeuwenhoek 113, 1191–1200 (2020). https://doi.org/10.1007/s10482-020-01426-1

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  • DOI: https://doi.org/10.1007/s10482-020-01426-1

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