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Isolation of Human Primary Valve Cells for In vitro Disease Modeling
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Ischemic postconditioning altered microRNAs in human valve replacement.

Yang Gao1, Rimao Huang1, Ri Chen1

  • 1Department of Cardiothoracic Surgery, Xiangya Hospital, Central South University, Changsha, P.R. China.

The Journal of Surgical Research
|August 9, 2015
PubMed
Summary

Ischemic postconditioning regulates microRNAs (miRNAs) and their targets, reducing apoptosis in patients undergoing valve surgery. This study explores miRNA regulation by postconditioning in double valve replacement patients.

Keywords:
ApoptosisMicroRNAsPostconditioningValve replacement

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Area of Science:

  • Cardiovascular Research
  • Molecular Biology
  • Surgical Innovation

Background:

  • MicroRNAs (miRNAs) role in myocardial infarction is known, but their regulation by ischemic postconditioning in cardiac surgery patients is unstudied.
  • This study investigates miRNA regulation by ischemic postconditioning during double valve replacement surgery.

Purpose of the Study:

  • To explore the regulation of specific microRNAs (miRNAs) by ischemic postconditioning (IPO) in patients undergoing double valve replacement.
  • To assess the impact of IPO on downstream gene and protein expression related to apoptosis.

Main Methods:

  • Prospective, controlled clinical study involving 30 patients undergoing double valve replacement.
  • Patients randomized into an ischemic postconditioning (IPO) group (n=15) and a control (CON) group (n=15).
  • Right atrial muscle samples collected pre- and post-cardiopulmonary bypass (CPB) for miRNA, gene, and apoptosis analysis.

Main Results:

  • IPO group showed altered miR-1 (downregulated) and miR-21 (upregulated) compared to CON.
  • BCL2 mRNA and protein increased, while BAX mRNA and protein decreased in the IPO group.
  • The IPO group exhibited a significantly smaller increase in apoptotic myocytes post-CPB.

Conclusions:

  • Ischemic postconditioning effectively regulates miR-1 and miR-21 in patients undergoing valvular heart surgery.
  • IPO influences downstream apoptotic pathways, leading to reduced myocyte apoptosis.
  • These findings suggest IPO as a potential protective strategy in cardiac surgery.