期刊
ENDOCRINE
卷 75, 期 3, 页码 740-751出版社
SPRINGER
DOI: 10.1007/s12020-021-02875-y
关键词
Irisin; Islet beta-cell; Insulin resistance; Inflammatory response; Lipotoxicity
资金
- Shanghai Sailing Program [19YF1428600]
- China Postdoctoral Science Foundation [2019M651588]
- Cultivation Program for the National Natural Science Foundation of China from Shanghai Tenth People's Hospital [081]
Research shows that irisin effectively decreases lipid levels in HFD mice, enhances glucose-stimulated insulin secretion, and inhibits the expressions of inflammatory cytokines both in vivo and in vitro experiments. Furthermore, irisin improves the PI3K/AKT insulin signaling pathway and inhibits the TLR4/NF-kappa B inflammatory signaling pathway.
Purpose Type 2 diabetes mellitus is characterized by insulin resistance and beta-cell dysfunction. Elevated free fatty acids-induced lipotoxicity may play a vital role in the pathogenesis of beta-cell insulin resistance. Exercise-stimulated myokine irisin has been reported to be closely related to T2DM. However, its function on beta-cell insulin signaling and the underlying mechanisms are only partially elucidated as yet. Methods High-fat diet-fed C57BL/6J mice and palmitic acid-treated MIN6 cell models were utilized as lipotoxic models. Factors associated with beta-cell insulin signaling transduction and inflammatory responses were assessed in these models. Furthermore, the role of irisin in beta-cells and the underlying mechanisms were also explored. Results Irisin effectively decreased lipid levels in HFD mice, enhanced glucose-stimulated insulin secretion and nullified the expressions of inflammatory cytokines in vivo and in vitro experiments. Moreover, irisin improved PI3K/AKT insulin signaling pathway and inhibited TLR4/NF-kappa B inflammatory signaling pathway in both islets of HFD mice and PA-treated MIN6 cells. Mechanistic analysis indicated that FOXO1 might serve as a bridge between the two pathways. Conclusion Irisin alleviates lipotoxicity-induced beta-cell insulin resistance and inflammatory response through the activation of PI3K/AKT/FOXO1 signaling pathways and the inhibition of TLR4/NF-kappa B signaling pathways. Irisin might provide a novel therapeutic strategy for T2DM.
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