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miR-217/Mafb Axis Involve in High Glucose-Induced β-TC-tet Cell Damage Via Regulating NF-κB Signaling Pathway.

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|July 7, 2020
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Summary

MicroRNA-217 (miR-217) is upregulated in type 2 diabetes mellitus (T2DM). Inhibiting miR-217 protects pancreatic beta cells from high glucose damage by regulating Mafb and the NF-κB pathway.

Keywords:
MAFBNF-κBType 2 diabetes mellitusmiR-217β-TC-tet

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Biology

Background:

  • Type 2 diabetes mellitus (T2DM) is characterized by pancreatic beta cell dysfunction.
  • MicroRNAs (miRNAs) play crucial roles in regulating cellular processes relevant to T2DM pathogenesis.
  • The specific role of miR-217 in T2DM remains to be fully elucidated.

Purpose of the Study:

  • To investigate the role of miR-217 in high glucose-induced pancreatic beta cell damage.
  • To identify the molecular targets and signaling pathways regulated by miR-217 in the context of T2DM.
  • To explore the therapeutic potential of targeting miR-217 for T2DM treatment.

Main Methods:

  • Utilized a mouse beta-cell line (β-TC-tet) exposed to high glucose (HG) to mimic T2DM conditions.
  • Assessed cell proliferation and apoptosis using cell counting kit-8 and flow cytometry.
  • Confirmed the interaction between miR-217 and Mafb via dual luciferase assay and Western blot analysis.
  • Analyzed GEO database for miR-217 expression in T2DM patients and investigated the NF-κB signaling pathway.

Main Results:

  • miR-217 expression was found to be upregulated in T2DM patients and significantly increased by HG treatment in beta cells.
  • HG treatment inhibited beta cell proliferation, promoted apoptosis and inflammation, and upregulated miR-217.
  • Depletion of miR-217 ameliorated HG-induced beta cell damage.
  • Mafb was identified as a direct target of miR-217, with miR-217 negatively regulating Mafb expression.
  • Knockdown of Mafb partially reversed the protective effects of miR-217 inhibition on beta cells.
  • HG upregulated key proteins in the NF-κB signaling pathway, an effect attenuated by miR-217 inhibition and Mafb silencing.

Conclusions:

  • Inhibition of miR-217 offers a protective effect against high glucose-induced pancreatic beta cell damage.
  • This protective mechanism involves the downregulation of Mafb and subsequent modulation of the NF-κB signaling pathway.
  • Targeting miR-217 represents a potential therapeutic strategy for managing type 2 diabetes mellitus.