Open Access

Amelioration of streptozotocin‑induced pancreatic β cell damage by morin: Involvement of the AMPK‑FOXO3‑catalase signaling pathway

  • Authors:
    • Ning Wang
    • Jiahui Zhang
    • Mengting Qin
    • Wenjing Yi
    • Shuang Yu
    • Yi Chen
    • Jing Guan
    • Rui Zhang
  • View Affiliations

  • Published online on: December 29, 2017     https://doi.org/10.3892/ijmm.2017.3357
  • Pages: 1409-1418
  • Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Pancreatic β cells are sensitive to oxidative stress, which is one of the predominant causes of cell damage and the emergence of diabetes. The identification of effective therapeutic strategies to protect pancreatic cells from oxidative stress has increased interest in the screening of antioxidants from natural products. The present study aimed to investigate the protective effects of morin against streptozotocin (STZ)‑induced cell damage in a rat insulinoma cell line (RINm5F pancreatic β cells) and to identify the underlying mechanisms. The results indicated that morin inhibited the increase in intracellular reactive oxygen species, attenuated the activity of poly (ADP‑ribose) polymerase, restored intracellular nicotinamide adenine dinucleotide levels and reduced the apoptotic cell death of STZ‑treated pancreatic β cells. Treatment with morin significantly upregulated catalase in pancreatic β cells, and ameliorated the STZ‑induced loss of catalase at the genetic, protein and enzymatic level. In further experiments, morin induced the phosphorylation of 5' adenosine monophosphate‑activated protein kinase (AMPK), which subsequently promoted the translocation of forkhead box O3 (FOXO3) to the nucleus. Specific small interfering RNAs (siRNAs) against AMPK and FOXO3 suppressed morin‑induced catalase expression. Furthermore, catalase‑specific siRNA abolished the protective effects of morin against STZ‑stimulated cell death. Taken together, these results indicated that morin protected RINm5F cells from STZ‑induced cell damage by triggering the phosphorylation of AMPK, thus resulting in subsequent activation of FOXO3 and induction of catalase.
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March 2018
Volume 41 Issue 3

Print ISSN: 1107-3756
Online ISSN:1791-244X

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APA
Wang, N., Zhang, J., Qin, M., Yi, W., Yu, S., Chen, Y. ... Zhang, R. (2018). Amelioration of streptozotocin‑induced pancreatic β cell damage by morin: Involvement of the AMPK‑FOXO3‑catalase signaling pathway. International Journal of Molecular Medicine, 41, 1409-1418. https://doi.org/10.3892/ijmm.2017.3357
MLA
Wang, N., Zhang, J., Qin, M., Yi, W., Yu, S., Chen, Y., Guan, J., Zhang, R."Amelioration of streptozotocin‑induced pancreatic β cell damage by morin: Involvement of the AMPK‑FOXO3‑catalase signaling pathway". International Journal of Molecular Medicine 41.3 (2018): 1409-1418.
Chicago
Wang, N., Zhang, J., Qin, M., Yi, W., Yu, S., Chen, Y., Guan, J., Zhang, R."Amelioration of streptozotocin‑induced pancreatic β cell damage by morin: Involvement of the AMPK‑FOXO3‑catalase signaling pathway". International Journal of Molecular Medicine 41, no. 3 (2018): 1409-1418. https://doi.org/10.3892/ijmm.2017.3357