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Article

17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway

  • Authors:
    • Liang Zhang
    • Yuyan Zhao
    • Lei Guo
  • View Affiliations / Copyright

    Affiliations: Department of Endocrinology, The First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China, Department of Orthopedic Surgery, The First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
  • Pages: 2839-2846
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    Published online on: February 7, 2018
       https://doi.org/10.3892/ijmm.2018.3470
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Abstract

17β-estradiol (17β-E2) is a steroid hormone that is known to exert effects on blood glucose homeostasis. The G protein‑coupled estrogen receptor (GPER) has been identified as a non-genomic estrogenic receptor, and is involved in numerous physiological processes, including cell survival, energy provision and metabolism. 17β-E2 may decrease apoptosis by binding to the GPER. The phosphoinositide 3-kinase (PI3K)/Akt signaling pathway is involved in physiological and pathological functions such as autophagy. The purpose of the present study was to investigate the role of the PI3K/Akt signaling pathway in the mediation of the effects of GPERs, and the effects of 17β-E2 on mitophagy in INS-1 cells, a rat insulin‑secreting β-cell line. In vitro, INS-1 cells were treated with different concentrations of 17β-E2 with and without pretreatment with a GPER antagonist (G15) or PI3K antagonist (LY294002) and compared with a negative control. An immunofluorescence assay demonstrated that GPERs are expressed in INS-1 cells. Western blot assays demonstrated that 17β-E2 increased GPER levels and the phosphorylation of Akt. Transmission electronic microscopy revealed that 17β-E2 reduced the formation of mitophagosomes and autophagosomes in INS-1 cells. An immunofluorescence staining assay indicated that the co-localization of translocase of mitochondrial outer membrane complex 20 (TOM20) with lysosomal-associated membrane protein 2 (LAMP2) was decreased in INS-1 cells treated with 17β-E2 alone. Western blotting demonstrated that 17β-E2 reduced the protein levels of activated microtubule-associated protein-1 light chain 3, and increased those of TOM20 and mitochondrial heat-shock protein 60. Notably, the protective effects of 17β-E2 were significantly diminished by G15 or LY294002. In conclusion, the present study suggests that 17β-E2 activates the PI3K/Akt pathway via the GPER in INS-1 cells. Furthermore, 17β-E2 may be involved in mitophagy by the regulating the GPER/PI3K/Akt pathway.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang L, Zhao Y and Guo L: 17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway. Int J Mol Med 41: 2839-2846, 2018.
APA
Zhang, L., Zhao, Y., & Guo, L. (2018). 17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway. International Journal of Molecular Medicine, 41, 2839-2846. https://doi.org/10.3892/ijmm.2018.3470
MLA
Zhang, L., Zhao, Y., Guo, L."17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway". International Journal of Molecular Medicine 41.5 (2018): 2839-2846.
Chicago
Zhang, L., Zhao, Y., Guo, L."17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway". International Journal of Molecular Medicine 41, no. 5 (2018): 2839-2846. https://doi.org/10.3892/ijmm.2018.3470
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang L, Zhao Y and Guo L: 17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway. Int J Mol Med 41: 2839-2846, 2018.
APA
Zhang, L., Zhao, Y., & Guo, L. (2018). 17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway. International Journal of Molecular Medicine, 41, 2839-2846. https://doi.org/10.3892/ijmm.2018.3470
MLA
Zhang, L., Zhao, Y., Guo, L."17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway". International Journal of Molecular Medicine 41.5 (2018): 2839-2846.
Chicago
Zhang, L., Zhao, Y., Guo, L."17β-estradiol protects INS-1 insulinoma cells from mitophagy via G protein-coupled estrogen receptors and the PI3K/Akt signaling pathway". International Journal of Molecular Medicine 41, no. 5 (2018): 2839-2846. https://doi.org/10.3892/ijmm.2018.3470
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