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• W1965019706 abstract "Cardiac hypertrophy by activation of the beta-adrenergic receptor (beta AR) is mediated more efficiently by the beta1-AR than by the beta2-AR. We investigated the signalling mechanism by which the beta1-AR mediates cardiac hypertrophy.Experiments were performed in cultured neonatal rat cardiomyocytes. Hypertrophy was determined by the protein/DNA content and atrial natriuretic factor transcription. Phosphorylation of Akt and Src was assessed by immunoblotting. Isoproterenol (ISO, 10 microM), a non-selective beta-AR agonist, caused selective downregulation of the beta1-AR (control beta1 vs. beta2: 35 vs. 65%, Bmax 78 +/- 4 fmol/mg; 4 h, 10 vs. 90%, 61 +/- 5 fmol/mg). Concanavalin A (Con A, 0.5 microg/mL), an inhibitor of endocytosis, prevented downregulation of beta1-ARs by ISO treatment (4 h, 35 vs. 65%, 73 +/- 8 fmol/mg), suggesting that beta1-ARs selectively undergo endocytosis. Interference with beta1-AR endocytosis by Con A, carboxyl terminal peptide of beta-AR kinase-1, dominant negative (DN) beta-arrestin-1, or DN dynamin inhibited beta-adrenergic hypertrophy, suggesting that the endocytosis machinery plays a key role in mediating beta-adrenergic hypertrophy. Activation of Akt by the beta1-AR was blocked by inhibition of the endocytosis machinery, suggesting that endocytosis mediates activation of Akt. Akt plays a critical role in beta-adrenergic hypertrophy, since DN Akt blocked ISO-induced hypertrophy. beta-Adrenergic activation of Akt is mediated by Src, which associates with the endocytosis machinery and is necessary and sufficient to mediate beta-adrenergic hypertrophy.Activation of the endocytosis machinery is required for activation of Akt, which, in turn, critically mediates beta1-AR-induced cardiac hypertrophy." @default.
• W1965019706 created "2016-06-24" @default.
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• W1965019706 date "2008-01-14" @default.
• W1965019706 modified "2023-10-06" @default.
• W1965019706 title "Endocytosis machinery is required for β1-adrenergic receptor-induced hypertrophy in neonatal rat cardiac myocytes" @default.
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• W1965019706 doi "https://doi.org/10.1093/cvr/cvn008" @default.
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