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Downregulation of miR-200a protects cardiomyocyte against apoptosis

Yansong Wang1, Yanan Jiang2, Xi Sun3

  • 1Department of Pain Management, Qunli Branch, The First Affiliated Hospital of Harbin Medical University, Harbin 150070, PR China; Department of Pharmacology (State-Province Key Laboratories of Biomedicine- Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin 150081, PR China.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|January 3, 2020
PubMed

Insights

MicroRNA-200a (miR-200a) is upregulated in acute myocardial infarction (AMI) and promotes apoptosis. Inhibiting miR-200a protects against AMI by downregulating Fus expression and reducing cardiomyocyte apoptosis.

Area of Science:

  • Cardiovascular Biology
  • Molecular Medicine
  • MicroRNA Research

Background:

  • Acute myocardial infarction (AMI) is a leading cause of death, with underlying molecular mechanisms requiring further elucidation.
  • Key regulators in ischemic heart disease pathogenesis, including microRNAs, remain incompletely understood.
  • This study investigates the role of miR-200a in AMI pathogenesis.

Purpose of the Study:

  • To investigate the involvement and mechanism of miR-200a in acute myocardial infarction.
  • To explore miR-200a's regulatory role in cardiomyocyte apoptosis and its potential as a therapeutic target.

Main Methods:

  • Established an AMI mouse model via left coronary artery ligation and an in vitro model using H₂O₂-treated cardiomyocytes.
  • Utilized miR-200a mimics and inhibitors (AMO-200a) for functional studies.
  • Assessed infarct size, cell apoptosis (flow cytometry), and gene/protein expression (RT-PCR, immunofluorescence, Western blot).

Main Results:

  • AMI models exhibited increased apoptosis and elevated miR-200a expression in both myocardial tissue and cardiomyocytes.
  • Inhibition of miR-200a (AMO-200a) reduced apoptosis and modulated apoptosis-related protein expression.
  • Bioinformatics and experimental data confirmed miR-200a targets Fus mRNA, with miR-200a negatively regulating Fus expression, which was downregulated in AMI models.

Conclusions:

  • The miR-200a-dependent apoptosis signaling pathway is crucial in AMI pathogenesis.
  • miR-200a and its regulation of Fus represent a potential therapeutic target for AMI.
  • Targeting miR-200a offers a promising strategy for mitigating myocardial injury in AMI.
Abstract

Keywords:
ApoptosisFused in sarcomaMyocardial ischemiamiR-200a

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