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miR-133a mediates the hypoxia-induced apoptosis by inhibiting TAGLN2 expression in cardiac myocytes.

Abstract：

:Myocardial hypoxia is a major cause of cardiac dysfunction due to its triggering cell injury and apoptosis. Deregulated microRNAs and their roles in cardiomyocyte apoptosis have attracted much attention. miR-133a is among the most abundant of the miRNAs present in the normal heart, and significant changes in expression of miR-133a were observed in response to anoxia stress. However, the role of this microRNA in myocardial hypoxia-induced apoptosis is presently unclear. In this study, we identified that miR-133a expression was down-regulated in hypoxic H9c2 cells, and its expression gradually decreased with hypoxia time. Functional analysis revealed that miR-133a attenuated hypoxia-induced apoptosis. We further detected expression of apoptosis-related proteins. The results showed that miR-133a suppressed the expression of apoptotic proteins caspase-8, caspase-9, and caspase-3 significantly, while improved the expression of Bcl-2. Bioinformatics analysis, combined with dual-luciferase reporter analysis, was applied to determine that miR-133a directly was binded to the 3'-untranslated region (3'-UTR) of TAGLN2 mRNA and suppressed expression at both transcriptional and translational levels. Next, TAGLN2 knockout was used to reveal that TAGLN2 modulated hypoxia-induced apoptosis via caspase-8 apoptotic pathway. Taken together, our data demonstrated the roles of miR-133a in hypoxia-induced apoptotic and implicate its potential in cardiac dysfunctions therapy.

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Li AY,Yang Q,Yang K

doi

10.1007/s11010-014-2273-2

subject

Has Abstract

pub_date

2015-02-01 00:00:00

pages

173-81

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

400

pub_type

杂志文章

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