Abstract
Purpose
Type 2 diabetes mellitus is characterized by insulin resistance and β-cell dysfunction. Elevated free fatty acids-induced lipotoxicity may play a vital role in the pathogenesis of β-cell insulin resistance. Exercise-stimulated myokine irisin has been reported to be closely related to T2DM. However, its function on β-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 β-cell insulin signaling transduction and inflammatory responses were assessed in these models. Furthermore, the role of irisin in β-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-κB 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 β-cell insulin resistance and inflammatory response through the activation of PI3K/AKT/FOXO1 signaling pathways and the inhibition of TLR4/NF-κB signaling pathways. Irisin might provide a novel therapeutic strategy for T2DM.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was supported by Shanghai Sailing Program (19YF1428600), China Postdoctoral Science Foundation (2019M651588) and Cultivation Program for the National Natural Science Foundation of China from Shanghai Tenth People’s Hospital (04. 03. 18. 081).
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SZ and SS contributed to the conception and design of the study; SZ, NC and XK contributed to perform the experiments and analyzed data. YH edited the manuscript. SZ, NC and SS contributed to the analysis and interpretation of the data. All authors revised and approved the final manuscript.
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Zheng, S., Chen, N., Kang, X. et al. Irisin alleviates FFA induced β-cell insulin resistance and inflammatory response through activating PI3K/AKT/FOXO1 signaling pathway. Endocrine 75, 740–751 (2022). https://doi.org/10.1007/s12020-021-02875-y
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DOI: https://doi.org/10.1007/s12020-021-02875-y