Title

Differential beta-2 adrenergic receptor gene expression in clinical hypertension

Document Type

Article

Abstract

Objectives: The beta-2 adrenergic receptor is involved in mediating vasodilatation via neurohumoral and sympathetic nervous system pathways. Alterations in beta-2 adrenergic receptor gene expression (mRNA transcription) may contribute to the hypertensive phenotype. Human gene expression in clinical phenotypes remains largely unexplored due to ethical constraints involved in obtaining human tissue. We devised a method to obtain normally discarded internal mammary artery tissue from coronary artery bypass graft patients. We then investigated differences in hypertensive and normotensive participants' beta-2 adrenergic receptor gene expression in this tissue. Methods: We collected arterial tissue samples from 46 coronary artery bypass patients in a surgical setting. Using 41 of the samples, we performed TaqMan real-time polymerase chain reaction (RT-PCR) and used the delta delta cycle threshold (ΔΔCt) relative quantitation method for determination of fold-differences in gene expression between normotensive and hypertensive participants. The beta-2 adrenergic receptor target was normalized to glyceraldehyde-phosphate dehydrogenase. Results: Participants with hypertension had significantly less-expressed beta-2 adrenoceptor gene (2.76-fold, p < .05) compared to normotensive participants. After Bonferroni correction, gene expression did not differ by race, gender, type/dose of β-blocker prescribed, positive family history of hypertension, or diagnosis of diabetes mellitus type 2. Conclusions: These data support the possibility of a molecular basis for impaired adrenoceptor-mediated vascular tone in hypertension. Modification and extension of this research is required.

Publisher Citation

Dungan, J. R., Conley, Y. P., Langaee, T. Y., Johnson, J. A., Kneipp, S. M., Hess, P. J., & Yucha, C. B. (2009). Altered beta-2 adrenergic receptor gene expression in human clinical hypertension. Biological research for nursing, 11(1), 17-26.