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• W2077691126 abstract "Cardiac hypertrophy produced in vivo by pressure overload is characterized by selective up-regulation of the fetal/neonatal beta-cardiac myosin heavy chain (MHC) isogene. However, a molecular signal for beta-MHC isogene induction has not been identified. We examined cardiac MHC isogene expression in a cell culture model for hypertrophy. alpha-MHC and beta-MHC iso-protein and iso-mRNA levels in cultured cardiac myocytes were quantified during hypertrophy stimulated by the alpha 1-adrenergic agonist, norepinephrine (NE). beta-MHC iso-protein content was increased 3.2-fold vs. control (P less than 0.001), whereas alpha-MHC isoprotein content was not changed significantly (1.4-fold vs. control, P = NS). MHC iso-mRNA levels were quantified by nuclease S1 analysis, using a single oligonucleotide probe. NE increased beta-MHC iso-mRNA content by 3.9-fold vs. control (P less than 0.001), but there was no change in alpha-MHC iso-mRNA (1.1-fold vs. control, P = NS). The NE-stimulated increase in beta-MHC iso-mRNA preceded in time the increase in beta-MHC isoprotein accumulation. The EC50 for NE induction of beta-MHC was 40 nM, and pharmacologic experiments indicated alpha 1-adrenergic receptor specificity. alpha-MHC isogene expression was predominant in control myocytes (68% alpha-isoprotein and 60% alpha-iso-mRNA). In contrast, beta-MHC expression was equal to alpha-MHC or predominant after treatment with NE (51% beta-isoprotein and 69% beta-iso-mRNA). Thus, alpha 1-adrenergic receptor stimulation increases the cellular contents of beta-MHC iso-mRNA and beta-MHC isoprotein during hypertrophy of cultured neonatal rat cardiac myocytes, but does not change the levels of alpha-MHC iso-mRNA or isoprotein. The effect on beta-MHC is mediated primarily at the level of mRNA steady-state level (pretranslational). Activation of the alpha 1-adrenergic receptor is the first identified molecular signal for increased beta-MHC isogene expression in a model of cardiac hypertrophy." @default.
• W2077691126 created "2016-06-24" @default.
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• W2077691126 date "1990-04-01" @default.
• W2077691126 modified "2023-10-16" @default.
• W2077691126 title "The cardiac beta-myosin heavy chain isogene is induced selectively in alpha 1-adrenergic receptor-stimulated hypertrophy of cultured rat heart myocytes." @default.
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• W2077691126 doi "https://doi.org/10.1172/jci114554" @default.
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