Korean Circulation Journal

The Korean Society of Cardiology (대한심장학회)
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CircZNF609 Aggravated Myocardial Ischemia Reperfusion Injury via Mediation of miR-214-3p/PTGS2 Axis

  • Wen-Qiang Tang (Department of Anesthesiology, The First Affiliated Hospital of University of South China) ;
  • Feng-Rui Yang (Department of Anesthesiology, The First Affiliated Hospital of University of South China) ;
  • Ke-Min Chen (Department of Anesthesiology, The First Affiliated Hospital of University of South China) ;
  • Huan Yang (Department of Anesthesiology, The First Affiliated Hospital of University of South China) ;
  • Yu Liu (Department of Anesthesiology, The First Affiliated Hospital of University of South China) ;
  • Bo Dou (Department of Anesthesiology, The First Affiliated Hospital of University of South China)
  • Received : 2021.07.21
  • Accepted : 2022.05.08
  • Published : 2022.09.01
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Abstract

Background and Objectives: Circular RNAs were known to play vital role in myocardial ischemia reperfusion injury (MIRI), while the role of CircZNF609 in MIRI remains unclear. This study was aimed to investigate the function of CircZNF609 in MIRI. Methods: Hypoxia/reoxygenation (H/R) model was established to mimic MIRI in vitro. Quantitative polymerase chain reaction was performed to evaluate gene transcripts. Cellular localization of CircZNF609 and miR-214-3p were visualized by fluorescence in situ hybridization. Cell proliferation was determined by CCK-8. TUNEL assay and flow cytometry were applied to detect apoptosis. Lactate dehydrogenase was determined by commercial kit. ROS was detected by DCFH-DA probe. Direct interaction of indicated molecules was determined by RIP and dual luciferase assays. Western blot was used to quantify protein levels. In vivo model was established to further test the function of CircZNF609 in MIRI. Results: CircZNF609 was upregulated in H/R model. Inhibition of CircZNF609 alleviated H/R induced apoptosis, ROS generation, restored cell proliferation in cardiomyocytes and human umbilical vein endothelial cells. Mechanically, CircZNF609 directly sponged miR-214-3p to release PTGS2 expression. Functional rescue experiments showed that miR-214-3p/PTGS2 axis was involved in the function of circZNG609 in H/R model. Furthermore, data in mouse model revealed that knockdown of CircZNF609 significantly reduced the area of myocardial infarction and decreased myocardial cell apoptosis. Conclusions: CircZNF609 aggravated the progression of MIRI via targeting miR-214-3p/PTGS2 axis, which suggested CircZNF609 might act as a vital modulator in MIRI.

Keywords

Acknowledgement

We would like to give our sincere gratitude to the reviewers for their constructive comments.

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