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Original Article
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Volume 347:1135-1142 October 10, 2002 Number 15
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Synergistic Polymorphisms of ß1- and {alpha}2C-Adrenergic Receptors and the Risk of Congestive Heart Failure
Kersten M. Small, Ph.D., Lynne E. Wagoner, M.D., Albert M. Levin, M.P.H., Sharon L.R. Kardia, Ph.D., and Stephen B. Liggett, M.D.

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ABSTRACT

Background Sustained cardiac adrenergic stimulation has been implicated in the development and progression of heart failure. Release of norepinephrine is controlled by negative feedback from presynaptic {alpha}2-adrenergic receptors, and the targets of the released norepinephrine on myocytes are {beta}1-adrenergic receptors. In transfected cells, a polymorphic {alpha}2C-adrenergic receptor ({alpha}2CDel322–325) has decreased function, and a variant of the {beta}1-adrenergic receptor ({beta}1Arg389) has increased function. We hypothesized that this combination of receptor variants, which results in increased synaptic norepinephrine release and enhanced receptor function at the myocyte, would predispose persons to heart failure.

Methods Genotyping at these loci was performed in 159 patients with heart failure and 189 controls. Logistic-regression methods were used to determine the potential effect of each genotype and the interaction between them on the risk of heart failure.

Results Among black subjects, the adjusted odds ratio for heart failure among persons who were homozygous for {alpha}2CDel322–325 as compared with those with the other {alpha}2C-adrenergic receptor genotypes was 5.65 (95 percent confidence interval, 2.67 to 11.95; P<0.001). There was no increase in risk with {beta}1Arg389 alone. However, there was a marked increase in the risk of heart failure among persons who were homozygous for both variants (adjusted odds ratio, 10.11; 95 percent confidence interval, 2.11 to 48.53; P=0.004). The patients with heart failure did not differ from the controls in the frequencies of nine short tandem-repeat alleles. Among white subjects, there were too few who were homozygous for both polymorphisms to allow an adequate assessment of risk.

Conclusions The {alpha}2CDel322–325 and {beta}1Arg389 receptors act synergistically to increase the risk of heart failure in blacks. Genotyping at these two loci may be a useful approach for identification of persons at risk for heart failure or its progression, who may be candidates for early preventive measures.


Source Information

From the Divisions of Pulmonary Medicine (K.M.S., S.B.L.) and Cardiology (L.E.W.) and the Departments of Medicine and Molecular Genetics (S.B.L.), University of Cincinnati College of Medicine, Cincinnati; and the Department of Epidemiology, University of Michigan, Ann Arbor (A.M.L., S.L.R.K.).

Drs. Small and Wagoner contributed equally to the article.

Address reprint requests to Dr. Liggett at the University of Cincinnati College of Medicine, 231 Albert Sabin Way, ML 0564, Cincinnati, OH 45267-0564, or at stephen.liggett{at}uc.edu.

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Related Letters:

Polymorphisms of Adrenergic Receptors and the Risk of Heart Failure
Meisel C., Köpke K., Roots I., Maitland M. L., Gomberg-Maitland M., Little J., Gwinn M., Khoury M., Kardia S. L.R., Levin A. M., Liggett S. B.
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N Engl J Med 2003; 348:468-470, Jan 30, 2003. Correspondence

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