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Na(+)-Ca(2+) exchanger targeting miR-132 prevents apoptosis of cardiomyocytes under hypoxic condition by suppressing Ca(2+) overload

 Soonchang Hong  ;  Jiyun Lee  ;  Hyang-Hee Seo  ;  Chang Yeon Lee  ;  Kyung-Jong Yoo  ;  Sung-Man Kim  ;  Seahyoung Lee  ;  Ki-Chul Hwang  ;  Eunhyun Choi 
 Biochemical and Biophysical Research Communications, Vol.460(4) : 931-937, 2015 
Journal Title
 Biochemical and Biophysical Research Communications 
Issue Date
During ischemia-reperfusion (IR) injury of the heart, Ca(2+) overload occurs, leading to cardiomyocyte dysfunction and eventual cell death by apoptosis. Since preventing Ca(2+) overload during IR injury has been reported to protect cardiomyocytes, interrupting Ca(2+) signaling cascades leading to Ca(2+) overload may exert protective effect on cardiomyocytes under hypoxic condition. One of the key regulators of the intracellular Ca(2+) level during IR injury is Na(+)-Ca(2+) exchanger 1 (NCX1), whose down-regulation during IR injury conferred protection of heart. In the present study, we examined whether down-regulation of NCX1 using exogenous microRNA ameliorates apoptosis of cardiomyocytes under hypoxic condition. Here, we identified miR-132 as a novel microRNA targeting the NCX1, whose expression increased during hypoxia. Delivery of miR-132 suppressed the increase of intracellular Ca(2+) in cardiomyocytes under hypoxia, and the expressions of apoptotic molecules, such as Bax, cytochrome C, and caspase 3, and the number of apoptotic cells were also decreased by exogenous miR-132 treatment. These results suggest the potential of miR-132 as an effective therapeutic agent against IR damage to heart by preventing Ca(2+) overload during hypoxic condition and warrant further studies to validate its anti-apoptotic effect in vivo.
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1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Thoracic and Cardiovascular Surgery (흉부외과학교실)
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원)
Yonsei Authors
서향희(Seo, Hyang Hee)
유경종(Yoo, Kyung Jong) ORCID logo https://orcid.org/0000-0002-9858-140X
이지윤(Lee, Ji Yun)
홍순창(Hong, Soon Chang)
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