Bbeta-adrenergic receptor kinase-1 levels in catecholamine-induced myocardial hypertrophy: regulation by beta- but not alpha1-adrenergic stimulation.

Published

Journal Article

Pressure overload ventricular hypertrophy is accompanied by dysfunctional beta-adrenergic receptor signaling due to increased levels of the beta-adrenergic receptor kinase-1, which phosphorylates and desensitizes beta-adrenergic receptors. In this study, we examined whether increased beta-adrenergic receptor kinase 1 expression is associated with myocardial hypertrophy induced by adrenergic stimulation. With use of implanted mini-osmotic pumps, we treated mice with isoproterenol, phenylephrine, or vehicle to distinguish between alpha1- and beta-adrenergic stimulation. Both treatments resulted in cardiac hypertrophy, but only isoproterenol induced significant increases in beta-adrenergic receptor kinase-1 protein levels and activity. Similarly, in isolated adult rat cardiac myocytes, 24 hours of isoproterenol stimulation resulted in a significant 2.8-fold increase in beta-adrenergic receptor kinase-1 protein levels, whereas 24 hours of phenylephrine treatment did not alter beta-adrenergic receptor kinase-1 expression. Our results indicate that increased beta-adrenergic receptor kinase-1 is not invariably associated with myocardial hypertrophy but apparently is controlled by the state of beta-adrenergic receptor activation.

Full Text

Duke Authors

Cited Authors

  • Iaccarino, G; Dolber, PC; Lefkowitz, RJ; Koch, WJ

Published Date

  • January 1999

Published In

Volume / Issue

  • 33 / 1 Pt 2

Start / End Page

  • 396 - 401

PubMed ID

  • 9931136

Pubmed Central ID

  • 9931136

International Standard Serial Number (ISSN)

  • 0194-911X

Language

  • eng

Conference Location

  • United States