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miR-1231 exacerbates arrhythmia by targeting calciumchannel gene CACNA2D2 in myocardial infarction

Jiefang Zhang1, Lili Wu1, Zhengwei Li1

  • 1Department of Cardiology, Sir Run Run Shaw Hospital, Zhejiang University of MedicineHangzhou 310016, Zhejiang, PR China.

American Journal of Translational Research
|May 5, 2017
PubMed

Insights

MicroRNAs (miRNAs) are key in heart attacks. This study found miR-1231 worsens arrhythmias after myocardial infarction by targeting cacna2d2, suggesting miR-1231 as an antiarrhythmic target.

Area of Science:

  • Cardiovascular Biology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) regulate gene expression and are implicated in cardiovascular diseases.
  • Acute myocardial infarction (AMI) can lead to heart failure, and the role of miRNAs in AMI is under investigation.
  • The specific functions of many miRNAs in myocardial infarction (MI) pathophysiology remain unclear.

Purpose of the Study:

  • To investigate the role of miR-1231 in the context of myocardial infarction (MI).
  • To identify the target gene of miR-1231 and elucidate its mechanism in ischemic heart.
  • To evaluate miR-1231 as a potential therapeutic target for arrhythmias post-MI.

Main Methods:

  • Quantitative analysis of miR-1231 and cacna2d2 expression in human and rat MI hearts.
  • Bioinformatic prediction and gene expression arrays to identify miR-1231 targets.
  • In vivo studies involving inhibition or overexpression of miR-1231 and cacna2d2 knockdown in rat MI models.

Main Results:

  • miR-1231 was found to be overexpressed in ischemic heart tissue.
  • cacna2d2 was identified and validated as a direct target of miR-1231, with its expression suppressed by miR-1231 in MI.
  • Inhibition of miR-1231 ameliorated arrhythmias, while its overexpression promoted them; cacna2d2 knockdown also induced arrhythmias.

Conclusions:

  • miR-1231 exacerbates cardiac arrhythmias in the context of MI by inhibiting cacna2d2.
  • This study highlights the significant arrhythmogenic role of miR-1231 in MI.
  • miR-1231 presents a potential novel antiarrhythmic therapeutic target for myocardial infarction.
Keywords:
Myocardial infarctionarrhythmiacacna2d2miR-1231miRNAs

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