Abstract
Intestinal fibrosis is a common complication of inflammatory bowel disease and is characterized by tissue stiffening and luminal narrowing. Dihydromyricetin (DHM) can alleviate liver fibrosis and renal interstitial fibrosis by inducing autophagy. However, whether DHM can alleviate intestinal fibrosis remains unclear. This study is aimed at evaluating the role and mechanism of action of DHM in inflammatory bowel disease-associated intestinal fibrosis. Mice were administered dextran sulfate sodium (DSS) in drinking water to induce inflammatory bowel disease-associated intestinal fibrosis. HE staining, qPCR, and Western blotting were used to analyze colon inflammation. Masson’s trichrome staining, qPCR, Western blotting, and immunofluorescence staining were used to evaluate the severity of fibrosis. Transmission electron microscopy and Western blotting were used to assess the activation of autophagosomes. The human colonic fibroblast line CCD-18Co was cultured in the presence of TGF-β1 to develop a fibrotic phenotype. Immunofluorescence staining, Western blotting, and qPCR were used to assess the alteration of fibrosis markers and used to investigate whether DHM-induced autophagy was involved in the inactivation of CCD-18Co cells. Additionally, the role of the PI3K/AKT/mTOR pathway was investigated. DHM alleviated intestinal inflammation and inhibited the progression of intestinal fibrosis. Additionally, DHM induced the activation of autophagy, thereby alleviating intestinal fibrosis, and downregulated the PI3K/AKT/mTOR signaling pathway in vitro. Overall, this study demonstrated that DHM can inhibit the progression of intestinal fibrosis and activation of colonic fibroblasts by inducing autophagy through the PI3K/AKT/mTOR signaling pathway, thereby playing a preventive and therapeutic role in intestinal fibrosis.
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Acknowledgements
The authors wish to thank the Cuiying Platform of Lanzhou University Second Hospital for the experimental instruments and KetengEdit for linguistic assistance during the preparation of this manuscript.
Funding
This study was supported by the Gansu Province Health Industry Project (No. GSWSKY2017-01), Lanzhou Talent Innovation and Entrepreneurship Project (No. 2018-RC-76), and Gansu Provincial People’s Hospital Science and technology innovation platform fund project (No. ZX-62000001–2021-136).
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D K ZH and T Y H designed the study. X CH W performed the experiments, analyzed the data, and wrote the manuscript. L D ZH and X N M performed some animal experiments. X L L guided the execution of the experiment. X L L and X N M revised the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.
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All procedures involving animals were approved by the Animal Care and Use Committee (No: D2021–173) of the Lanzhou University Second Hospital.
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Wang, X., Li, X., Ma, X. et al. Dihydromyricetin alleviates inflammatory bowel disease associated intestinal fibrosis by inducing autophagy through the PI3K/AKT/mTOR signaling pathway. Naunyn-Schmiedeberg's Arch Pharmacol (2023). https://doi.org/10.1007/s00210-023-02856-0
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DOI: https://doi.org/10.1007/s00210-023-02856-0