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The Arg389Gly beta1-adrenoceptor polymorphism and catecholamine effects on plasma-renin activity. | LitMetric

AI Article Synopsis

Article Abstract

Objectives: The purpose of this research was to find out whether, in humans, dobutamine-induced hemodynamic effects and increase in plasma-renin activity (PRA) might be beta1-adrenoceptor (beta1AR) genotype-dependent.

Background: In vitro Arg389Gly-beta1AR polymorphism exhibits decreased receptor signaling.

Methods: We studied 10 male homozygous Arg389-beta1AR subjects and 8 male homozygous Gly389beta1AR subjects; to avoid influences of codon 49 polymorphism, all were homozygous Ser49-beta1AR. Subjects were infused with dobutamine (1 to 6 microg/kg/min) with or without bisoprolol (10 mg orally) pretreatment, and PRA, heart rate, contractility, and blood pressure were assessed.

Results: With regard to PRA, dobutamine increased PRA more potently in Arg389-beta1AR versus Gly389-beta1AR subjects. Bisoprolol markedly suppressed the dobutamine-induced PRA increase in Arg389- but only marginally in Gly389-beta1AR subjects. With regard to hemodynamics, dobutamine caused larger heart rate and contractility increases and diastolic blood pressure decreases in Arg389- versus Gly389-beta1AR subjects. Bisoprolol reduced dobutamine-induced heart rate and contractility increases and diastolic blood pressure decreases more potently in Arg389- versus Gly389-beta1AR subjects.

Conclusions: Codon 389 beta1AR polymorphism is a determinant not only of hemodynamic effects but also of PRA. Thus, beta1AR polymorphisms may be useful for predicting therapeutic responses to betaAR-blocker treatment.

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http://dx.doi.org/10.1016/j.jacc.2005.08.041DOI Listing

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