Micro RNAs are small, non-coding RNA molecules that regulate gene expression via either translational inhibition or mRNA degredation. Enhancer of zeste homolog 2 (EZH2)-mediated hypertrophic signaling is a major regulatory response to hypertrophic stimuli. In this study, we constructed AAC rat models and PE-induced hypertrophic cardiomyocytes. We demonstrated that miR-214 relative levels were upregulated, whereas EZH2 was downregulated in both vivo and vitro models. Further, one conserved base-pairing site in the EZH2 3'-untranslated region (UTR) was verified. Mutation of the site in the EZH2 3'-UTR completely blocked the negative effect of miR-214 on EZH2, suggesting that EZH2 is a direct target for miR-214 regulation. Using a gain-of-function approach, incorporating the lentivirus constructed miR-214 and its sponge, we demonstrated that miR-214 significantly regulated endogenous levels of EZH2 gene expression; whereas, changes in the expression of the Sine oculis homeobox homolog gene were induced by an adrenergic receptor agonist in the AAC rat model. Having made this study it is possible to conclude that the negative regulation of EZH2 expression contributed to miR-214-mediated cardiac hypertrophy.
Keywords: Acta1; Cardiac hypertrophy; EZH2; Lenti-miR-214; Lenti-spg; MiRNAs; Myh7; Nppa; PRC2; Six1; UTR; actin alpha 1; beta-myosin heavy-chain gene; enhancer of zeste homolog 2; lentivirus-miR-214; lentivirus-miR-214 sponge; miR-214; microRNA-214; natriuretic peptide A; polycomb repressor complex 2; sine oculis homeobox homolog 1; untranslated region.
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