In:
Journal of Cellular Physiology, Wiley, Vol. 235, No. 9 ( 2020-09), p. 6085-6102
Abstract:
Apoptosis and fibrosis play a vital role in myocardial infarction (MI) induced tissue injury. Although microRNAs have been the focus of many studies on cardiac apoptosis and fibrosis in MI, the detailed effects of miR‐26a is needed to further understood. The present study demonstrated that miR‐26a was downregulated in ST‐elevation MI (STEMI) patients and oxygen‐glucose deprivation (OGD)‐treated H9c2 cells. Downregulation of miR‐26a was closely correlated with the increased expression of creatine kinase, creatine kinase‐MB and troponin I in STEMI patients. Further analysis identified that ataxia–telangiectasia mutated (ATM) was a target gene for miR‐26a based on a bioinformatics analysis. miR‐26a overexpression effectively reduced ATM expression, apoptosis, and apoptosis‐related proteins in OGD‐treated H9c2 cells. In a mouse model of MI, the expression of miR‐26a was significantly decreased in the infarct zone of the heart, whereas apoptosis and ATM expression were increased. miR‐26a overexpression effectively reduced ATM expression and cardiac apoptosis at Day 1 after MI. Furthermore, we demonstrated that overexpression of miR‐26a improved cardiac function and reduced cardiac fibrosis by the reduced expression of collagen type I and connective tissue growth factor (CTGF) in mice at Day 14 after MI. Overexpression of miR‐26a or ATM knockdown decreased collagen I and CTGF expression in cultured OGD‐treated cardiomyocytes. Taken together, these data demonstrate a prominent role for miR‐26a in linking ATM expression to ischemia‐induced apoptosis and fibrosis, key features of MI progression. miR‐26a reduced MI development by affecting ATM expression and could be targeted in the treatment of MI.
Type of Medium:
Online Resource
ISSN:
0021-9541
,
1097-4652
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
1478143-8
SSG:
12
