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2019 ; 18
(5
): 621-637
Nephropedia Template TP
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Overexpression of microRNA-202-3p protects against myocardial
ischemia-reperfusion injury through activation of TGF-?1/Smads signaling pathway
by targeting TRPM6
#MMPMID30810438
Wu HY
; Wu JL
; Ni ZL
Cell Cycle
2019[Mar]; 18
(5
): 621-637
PMID30810438
show ga
MicroRNAs (miRNAs) have been found to act as key regulators in the pathogenesis
of myocardial ischemic-reperfusion (I/R) injury. In this study, we explore the
role and mechanism of microRNA-202-3p (miR-202-3p) in regulating cardiomyocyte
apoptosis, in respective of the TGF-?1/Smads signaling pathway by targeting the
transient receptor potential cation channel, subfamily M, member 6 (TRPM6). The
targeting relationship between miR-202-3p and TRPM6 was verified by a
dual-luciferase reporter gene assay. Sprague-Dawley rat models of myocardial I/R
injury were initially established and treated with different mimics, inhibitors
and siRNAs to test the effects of miR-202-3p and TRPM6 on myocardial I/R injury.
The levels of inflammatory factors; IL-1?, IL-6, TNF-? as well as the degree of
myocardial fibrosis and cardiomyocyte apoptosis were determined in rats
transfected with different plasmids. TRPM6 was found to be the target of
miR-202-3p. Up-regulated miR-202-3p or knockdown of TRPM-6 alleviated oxidative
stress and inflammatory response, reduced ventricular mass, altered cardiac
hemodynamics, suppressed myocardial infarction, attenuated cell apoptosis, and
inhibited myocardial fibrosis. MiR-202-3p overexpression activates the
TGF-?1/Smads signaling pathway by negatively regulating TRPM6 expression. Taken
together, these findings suggest that miR-202-3p offers protection against
ventricular remodeling after myocardial I/R injury via activation of the
TGF-?1/Smads signaling pathway.