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• W2936002847 abstract "Rationale: Embryonic heart is characterized of rapidly dividing cardiomyocytes required to build a working myocardium. Cardiomyocytes retain some proliferative capacity in the neonates but lose it in adulthood. Consequently, a number of signaling hubs including microRNAs are altered during cardiac development that adversely impacts regenerative potential of cardiac tissue. Embryonic stem cell cycle miRs are a class of microRNAs exclusively expressed during developmental stages; however, their effect on cardiomyocyte proliferation and heart function in adult myocardium has not been studied previously. Objective: To determine whether transient reintroduction of embryonic stem cell cycle miR-294 promotes cardiomyocyte cell cycle reentry enhancing cardiac repair after myocardial injury. Methods and Results: miR-294 is expressed in the heart during development, prenatal stages, lost in the neonate, and adult heart confirmed by qRT-PCR and in situ hybridization. Neonatal ventricular myocytes treated with miR-294 showed elevated expression of Ki67, p-histone H3, and Aurora B confirmed by immunocytochemistry compared with control cells. miR-294 enhanced oxidative phosphorylation and glycolysis in Neonatal ventricular myocytes measured by seahorse assay. Mechanistically, miR-294 represses Wee1 leading to increased activity of the cyclin B1/CDK1 complex confirmed by qRT-PCR and immunoblot analysis. Next, a doxycycline-inducible AAV9-miR-294 vector was delivered to mice for activating miR-294 in myocytes for 14 days continuously after myocardial infarction. miR-294–treated mice significantly improved left ventricular functions together with decreased infarct size and apoptosis 8 weeks after MI. Myocyte cell cycle reentry increased in miR-294 hearts analyzed by Ki67, pH3, and AurB (Aurora B kinase) expression parallel to increased small myocyte number in the heart. Isolated adult myocytes from miR-294 hearts showed increased 5-ethynyl-2′-deoxyuridine+ cells and upregulation of cell cycle markers and miR-294 targets 8 weeks after MI. Conclusions: Ectopic transient expression of miR-294 recapitulates developmental signaling and phenotype in cardiomyocytes promoting cell cycle reentry that leads to augmented cardiac function in mice after myocardial infarction." @default.
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• W2936002847 date "2019-06-21" @default.
• W2936002847 modified "2023-10-15" @default.
• W2936002847 title "Transient Introduction of miR-294 in the Heart Promotes Cardiomyocyte Cell Cycle Reentry After Injury" @default.
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• W2936002847 doi "https://doi.org/10.1161/circresaha.118.314223" @default.
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