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Reconstitution of HuR-Inhibited CUGBP1 Expression Protects Cardiomyocytes from Acute Myocardial Infarction-Induced Injury.

Antioxid. Redox Signal.2017 Nov 10;27(14):1013-1026. doi:10.1089/ars.2016.6880. Epub 2017 Mar 28
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摘要


AIM:Myocardial infarction (MI) is one of the leading causes of death in elderly people. Expanding the knowledge of the molecular mechanisms underlying MI is of profound importance to developing a cure for MI. The CUGBP- and ETR-3-like factor (CELF) proteins, a family of RNA-binding proteins, play key roles in RNA metabolism. To determine the functions and molecular mechanisms of CELF proteins in MI, an animal model of acute myocardial infarction (AMI) was used in our study. RESULTS:We found that the CUG triplet repeat RNA-binding protein 1 (CUGBP1)/CELF1 expression levels were decreased in AMI-injured hearts, and further studies showed that two highly conserved adenylate-uridylate-rich (AU-rich) elements in the 3'UTR of CUGBP1 were responsible for the decreased CUGBP1 expression. Upon AMI, human antigen R (HuR) was relocated to the cytoplasm from the nucleus and interacted with these AU-rich elements to affect the expression of CUGBP1. Reintroduction of CUGBP1 via gene delivery by recombinant adenovirus improved cardiac function in AMI mice. Our studies also indicated that CUGBP1 protected cardiomyocytes from ischemia-induced injury through the promotion of angiogenesis and inhibition of apoptosis by regulating the vascular endothelial growth factor-A gene. Innovation and Conclusion: Our studies indicate a role for CUGBP1 in cardiac disease and reveal a novel MI post-transcriptional gene regulatory mechanism. The reconstitution of CUGBP1 could be developed as a potential therapeutic option for the management of MI. Antioxid. Redox Signal. 27, 1013-1026.

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