MicroRNA‐582‐5p targeting Creb1 modulates apoptosis in cardiomyocytes hypoxia/reperfusion‐induced injury

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Abstract
Background: Myocardial ischemia–reperfusion injury (MIRI) caused by the reperfusion therapy of myocardial ischemic diseases is a kind of major disease that threatens human health and lives severely. There are lacking of effective therapeutic measures for MIRI. MicroRNAs (miRNAs) are abundant in mammalian species and play a critical role in the initiation, promotion, and progression of MIRI. However, the biological role and molecular mechanism of miRNAs in MIRI are not entirely clear. Methods: We used bioinformatics analysis to uncover the significantly different miRNA by analyzing transcriptome sequencing data from myocardial tissue in the mouse MIRI model. Multiple miRNA‐related databases, including miRdb, PicTar, and TargetScan were used to forecast the downstream target genes of the differentially expressed miRNA. Then, the experimental models, including male C57BL/6J mice and HL‐1 cell line, were used for subsequent experiments including quantitative real‐time polymerase chain reaction analysis, western blot analysis, hematoxylin and eosin staining, flow cytometry, luciferase assay, gene interference, and overexpression. Results: MiR‐582‐5p was found to be differentially upregulated from the transcriptome sequencing data. The elevated levels of miR‐582‐5p were verified in MIRI mice and hypoxia/reperfusion (H/R)‐induced HL‐1 cells. Functional experiments revealed that miR‐582‐5p promoted apoptosis of H/R‐induced HL‐1 cells via downregulating cAMP‐response element‐binding protein 1 (Creb1). The inhibiting action of miR‐582‐5p inhibitor on H/R‐induced apoptosis was partially reversed after Creb1 interference. Conclusions: Collectively, the research findings reported that upregulation of miR‐582‐5p promoted H/R‐induced cardiomyocyte apoptosis by inhibiting Creb1. The potential diagnostic and therapeutic strategies targeting miR‐582‐5p and Creb1 could be beneficial for the MIRI treatment.

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