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miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression

  • Authors:
    • Min Wang
    • Jilou Wei
    • Ting Ji
    • Kui Zang
  • View Affiliations / Copyright

    Affiliations: Department of Critical Care Medicine, The First Affiliated Huai'an People's Hospital of Nanjing Medical University, Huai'an, Jiangsu 223300, P.R. China
    Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 664
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    Published online on: April 22, 2021
       https://doi.org/10.3892/etm.2021.10096
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Abstract

MicroRNA (miR)‑770‑5p expression is increased in patients with type 2 diabetes mellitus (T2DM) compared with healthy controls; however, the roles and molecular mechanism underlying miR‑770‑5p in T2DM are not completely understood. In the present study, the reverse transcription‑quantitative PCR (RT‑qPCR) results indicated that miR‑770‑5p expression was significantly increased and Bcl‑2 associated athanogene 5 (BAG5) expression was significantly decreased in the serum of patients with T2DM compared with healthy volunteers. TargetScan and a dual luciferase reporter gene system were used to predict and verify BAG5 as a target gene of miR‑770‑5p. Additionally, the RT‑qPCR results demonstrated that miR‑770‑5p expression was significantly increased and BAG5 expression was significantly decreased in uric acid (UA)‑treated Min6 cells compared with control cells. Min6 cells were transfected with miR‑770‑5p inhibitor and BAG5‑small interfering (si)RNA to alter expression levels. The results indicated that miR‑770‑5p negatively regulated BAG5. The effect of miR‑770‑5p knockdown on UA‑induced pancreatic β‑cell damage and dysfunction was subsequently assessed. Min6 cells were transfected with miR‑770‑5p inhibitor or miR‑770‑5p inhibitor + BAG5‑siRNA for 48 h, followed by treatment with or without 5 mg/dl UA for 24 h. Cell viability, apoptosis, apoptosis‑related factor expression levels and insulin secretion were assessed. The results demonstrated that UA treatment significantly reduced cell viability, increased cell apoptosis and reduced insulin secretion in Min6 cells compared with the control group. miR‑770‑5p inhibitor significantly attenuated UA‑induced injury and dysfunction of Min6 cells, whereas BAG5 knockdown abolished the protective effects of miR‑770‑5p inhibitor on UA‑damaged Min6 cells. In conclusion, miR‑770‑5p was highly expressed in the serum of patients with T2DM compared with healthy volunteers. In UA‑treated pancreatic β‑cells, compared with the inhibitor control group, miR‑770‑5p knockdown regulated the expression of apoptosis‑related genes, increased cell viability, inhibited cell apoptosis and increased insulin secretion by targeting BAG5. Therefore, the present study suggested that miR‑770‑5p inhibitor may serve a protective role in T2DM.
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Copy and paste a formatted citation
Spandidos Publications style
Wang M, Wei J, Ji T and Zang K: miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression. Exp Ther Med 22: 664, 2021.
APA
Wang, M., Wei, J., Ji, T., & Zang, K. (2021). miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression. Experimental and Therapeutic Medicine, 22, 664. https://doi.org/10.3892/etm.2021.10096
MLA
Wang, M., Wei, J., Ji, T., Zang, K."miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression". Experimental and Therapeutic Medicine 22.1 (2021): 664.
Chicago
Wang, M., Wei, J., Ji, T., Zang, K."miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression". Experimental and Therapeutic Medicine 22, no. 1 (2021): 664. https://doi.org/10.3892/etm.2021.10096
Copy and paste a formatted citation
x
Spandidos Publications style
Wang M, Wei J, Ji T and Zang K: miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression. Exp Ther Med 22: 664, 2021.
APA
Wang, M., Wei, J., Ji, T., & Zang, K. (2021). miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression. Experimental and Therapeutic Medicine, 22, 664. https://doi.org/10.3892/etm.2021.10096
MLA
Wang, M., Wei, J., Ji, T., Zang, K."miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression". Experimental and Therapeutic Medicine 22.1 (2021): 664.
Chicago
Wang, M., Wei, J., Ji, T., Zang, K."miRNA‑770‑5p expression is upregulated in patients with type 2 diabetes and miRNA‑770‑5p knockdown protects pancreatic β‑cell function via targeting BAG5 expression". Experimental and Therapeutic Medicine 22, no. 1 (2021): 664. https://doi.org/10.3892/etm.2021.10096
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