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PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis

  • Authors:
    • Zhengwei Zhang
    • Beier Tong
    • Jie Liu
    • Jieyuan Feng
    • Linyang Song
    • Huawei Wang
    • Mengting Ke
    • Chengkai Xu
    • Yancheng Xu
  • View Affiliations / Copyright

    Affiliations: Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China, Department of Endocrinology, Suizhou Central Hospital, Suizhou, Hubei 441300, P.R. China
    Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 549
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    Published online on: October 10, 2023
       https://doi.org/10.3892/etm.2023.12247
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Abstract

Protein phosphatase 2A (PP2A) is one of the most common serine/threonine phosphatases in mammalian cells, and it primarily functions to regulate cell signaling, glycolipid metabolism and apoptosis. The catalytic subunit of PP2A (PP2Ac) plays an important role in the functions of the protein. However, there are few reports on the regulatory role of PP2Ac in pancreatic β‑cells under lipotoxic conditions. In the present study, mouse insulinoma 6 (MIN6) pancreatic cells were transfected with short hairpin RNAs to generate PP2Ac knockdown cells and incubated with palmitate (PA) to establish a lipotoxicity model. Serine/threonine phosphatase assay system, Cell Counting Kit‑8, flow cytometry, enzyme‑linked immunosorbent assay and western blotting were used to measure PP2A activity, cell viability, apoptosis, oxidative stress and insulin secretion in the cells. In addition, a mouse model of lipotoxicity was established with a high‑fat diet (HFD) and the knockdown of PP2Ac using adeno‑associated viruses to interfere with PP2Ac expression in the pancreatic tissues. The activity of PP2A in the mouse pancreatic tissue and the serum insulin level were measured. Furthermore, the proliferation of mouse pancreatic β‑cells was assessed using pancreatic tissue immunofluorescence. PP2Ac knockdown inhibited lipotoxicity‑induced PP2A hyperactivation, increased the resistance of pancreatic β‑cells to lipotoxicity and attenuated PA‑induced apoptosis in MIN6 cells. It also protected the endoplasmic reticulum and mitochondria, and ameliorated insulin secretion. The results of mRNA sequencing and western blotting analysis suggested that the protective effects of PP2Ac knockdown in MIN6 cells may be mediated via the MAPK pathway. Moreover, the results of the animal experiments suggested that specific knockdown of pancreatic PP2Ac effectively attenuated HFD‑induced insulin resistance and reduced the compensatory proliferation of pancreatic β‑cells in mice. In summary, the present study revealed the effects of interfering with PP2Ac gene expression on pancreatic β‑cells in vivo and in vitro and the underlying mechanisms, which may provide insights for the treatment of type 2 diabetes mellitus in the clinic.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang Z, Tong B, Liu J, Feng J, Song L, Wang H, Ke M, Xu C and Xu Y: PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis. Exp Ther Med 26: 549, 2023.
APA
Zhang, Z., Tong, B., Liu, J., Feng, J., Song, L., Wang, H. ... Xu, Y. (2023). PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis. Experimental and Therapeutic Medicine, 26, 549. https://doi.org/10.3892/etm.2023.12247
MLA
Zhang, Z., Tong, B., Liu, J., Feng, J., Song, L., Wang, H., Ke, M., Xu, C., Xu, Y."PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis". Experimental and Therapeutic Medicine 26.6 (2023): 549.
Chicago
Zhang, Z., Tong, B., Liu, J., Feng, J., Song, L., Wang, H., Ke, M., Xu, C., Xu, Y."PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis". Experimental and Therapeutic Medicine 26, no. 6 (2023): 549. https://doi.org/10.3892/etm.2023.12247
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang Z, Tong B, Liu J, Feng J, Song L, Wang H, Ke M, Xu C and Xu Y: PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis. Exp Ther Med 26: 549, 2023.
APA
Zhang, Z., Tong, B., Liu, J., Feng, J., Song, L., Wang, H. ... Xu, Y. (2023). PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis. Experimental and Therapeutic Medicine, 26, 549. https://doi.org/10.3892/etm.2023.12247
MLA
Zhang, Z., Tong, B., Liu, J., Feng, J., Song, L., Wang, H., Ke, M., Xu, C., Xu, Y."PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis". Experimental and Therapeutic Medicine 26.6 (2023): 549.
Chicago
Zhang, Z., Tong, B., Liu, J., Feng, J., Song, L., Wang, H., Ke, M., Xu, C., Xu, Y."PP2Ac knockdown attenuates lipotoxicity‑induced pancreatic β‑cell dysfunction and apoptosis". Experimental and Therapeutic Medicine 26, no. 6 (2023): 549. https://doi.org/10.3892/etm.2023.12247
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