Abstract
Background
Helicobacter pylori infection is considered as the major risk factor for gastric adenocarcinoma. Today, the increasing emergence of antibiotic-resistant strains has drastically decreased the eradication rate of H. pylori infection. This study was aimed to investigate the inhibitory and modulatory effects of live and pasteurized Lactobacillus crispatus strain RIGLD-1 on H. pylori adhesion, invasion, and inflammatory response in AGS cell line.
Methods and results
The probiotic potential and properties of L. crispatus were evaluated using several functional and safety tests. Cell viability of AGS cells exposed to varying concentrations of live and pasteurized L. crispatus was assessed by MTT assay. The adhesion and invasion abilities of H. pylori exposed to either live or pasteurized L. crispatus were examined by gentamycin protection assay. The mRNA expression of IL-1β, IL-6, IL-8, TNF-α, IL-10, and TGF-ß genes was determined by RT-qPCR from coinfected AGS cells. ELISA was used for the detection of IL-8 secretion from treated cells. Both live and pasteurized L. crispatus significantly decreased H. pylori adhesion/invasion to AGS cells. In addition, both live and pasteurized L. crispatus modulated H. pylori-induced inflammation by downregulating the mRNA expression of IL-1β, IL-6, IL-8, and TNF-α and upregulating the expression of IL-10, and TGF-ß cytokines in AGS cells. Furthermore, H. pylori-induced IL-8 production was dramatically decreased after treatment with live and pasteurized L. crispatus.
Conclusions
In conclusion, our findings demonstrated that live and pasteurized L. crispatus strain RIGLD-1 are safe, and could be suggested as a potential probiotic candidate against H. pylori colonization and inflammation.
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Data availability
Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.
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Acknowledgements
The authors wish to thank laboratory staff of the Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran. We also are grateful to the staff of the Department of Microbiology and Microbial Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran.
Funding
The study was funded by a research grant (Project No: RIGLD 1128) from the Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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FF performed microbiological experiments, cell culture, RT-qPCR, data analysis, and wrote the manuscript draft; AY designed the study, participated in data analysis, conceptualization, writing and editing, and project administration; AY, AS, FP and NS critically revised the manuscript. All authors read the final version of the manuscript and approved the list of authors.
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This work does not contain any studies related with human participants or animals. The study was approved by the Institutional Ethical Review Committee of the Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran (Project No. IR.SBMU.RIGLD.REC.1399.046).
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Fakharian, F., Sadeghi, A., Pouresmaeili, F. et al. Immunomodulatory effects of live and pasteurized Lactobacillus crispatus strain RIGLD-1 on Helicobacter pylori-triggered inflammation in gastric epithelial cells in vitro. Mol Biol Rep 50, 6795–6805 (2023). https://doi.org/10.1007/s11033-023-08596-x
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DOI: https://doi.org/10.1007/s11033-023-08596-x