Abstract
Salmonella typhimurium (S. typhimurium) constitutes a major public health concern. We have previously proven that Lactobacillus crispatus 7-4 (L. crispatus 7-4) can inhibit the growth of S. typhimurium and thus can be used as a biocontrol strategy to suppress foodborne S. typhimurium infections. However, the inhibitory effect and in-depth mechanism of L. crispatus 7-4 remain to be elucidated. In this study, we found that L. crispatus 7-4 can protect against S. typhimurium-induced ileum injury by promoting intestinal barrier integrity, maintaining intestinal mucosal barrier homeostasis, and reducing intestinal inflammatory response. Furthermore, we demonstrated that this probiotic strain can increase the abundance of Lactobacillus spp. to maintain microbial homeostasis and simultaneously increase the amount of γ‑glutamylcysteine (γ-GC) by activating the glutathione metabolic pathway. The increased γ-GC promoted the transcription of Nrf2 target genes, thereby improving the host antioxidant level, reducing reactive oxygen species (ROS) accumulation, and removing pro-inflammatory cytokines. In other words, L. crispatus 7-4 could activate the enterocyte Nrf2 pathway by improving γ-GC to protect against S. typhimurium-induced intestinal inflammation and oxidative damage.
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Acknowledgements
We would like to thank Yuting Wu, Shuo Zhang, Jiwen Liu and Meihua Zhang for helping with the necropsy of experimental animals.
Funding
This work was supported by the National Key R&D Program (2022YFC2105005), the Forestry Science and Technology Innovation and Promotion Project of Jiangsu Province (LYKJ [2021]40), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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SS and WH designed the experiments. WH, DC, and CC carried out animal experiment, data analysis, and drafted the manuscript. WH and LS did the cell culture. GZ analyzed the qRT-PCR. WH and DC wrote the manuscript. CC revised the paper. SS, SW, and ZH reviewed the manuscript.
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Wu, H., Ding, C., Chi, C. et al. Lactobacillus crispatus 7-4 Mitigates Salmonella typhimurium-Induced Enteritis via the γ‑Glutamylcysteine-Mediated Nrf2 Pathway. Probiotics & Antimicro. Prot. (2024). https://doi.org/10.1007/s12602-024-10294-4
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DOI: https://doi.org/10.1007/s12602-024-10294-4