Abstract
In recent years, marine-derived bioactive peptides have gained considerable attention owing to their high biomedical and pharmaceutical potential. In this study, we investigated the hypoglycemic activity of fish roe polypeptide (FRP) in islet β-cells (INS-1) and the molecular mechanism whereby FRP exerts this effect. Insulin secretion, cell viability, cell apoptosis, intracellular reactive oxygen species (ROS), and intracellular antioxidant-related enzymes were detected. The nuclear factor erythroid 2-related factor 2 (Nrf2)/extracellular signal-regulated kinase (ERK) pathway was analyzed to reveal the mechanism underpinning FRP’s hypoglycemic effect. The results showed that FRP treatment promoted insulin secretion and cell viability, reduced apoptosis and intracellular ROS levels, and increased the activity and content of antioxidant-related enzymes. Cell signaling pathway analysis revealed that FRP was able to alleviate H2O2-induced oxidative stress by activating the Nrf2/ERK pathway. This was demonstrated by an evident decrease in cell viability and insulin secretion in the presence of the ERK blocker U0126. Altogether, these results suggest that FRP exerts its hypoglycemic effect by regulating insulin secretion, which is mediated by Nrf2/ERK signaling.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Number 21605149); National Key R&D Program of China (Grant Number 2017YFF0207800); Natural Science Foundation of Gansu Province (Grant Number 18JR3RA381); Qingdao Science and Technology Project (Grant Number 17-3-3-66-nsh).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Wenya Chen, Lina Zhang, Jing Chen, and Yongsheng Li. The first draft of the manuscript was written by Wenya Chen, Jianteng Wei and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Chen, W., Wei, J., Zhang, L. et al. Fish Roe Polypeptide Exerts Hypoglycemia Activity via Regulating Insulin Secretion Mediated by Nrf2/ERK Signaling. Int J Pept Res Ther 27, 543–553 (2021). https://doi.org/10.1007/s10989-020-10106-7
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DOI: https://doi.org/10.1007/s10989-020-10106-7