Alpha 1A-adrenergic receptor polymorphism and vascular response.

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Citation

Sofowora GG, Dishy V, Landau R, Xie HG, Prasad HC, Byrne DW, Smiley RM, Kim RB, Wood AJ, Stein CM

Alpha 1A-adrenergic receptor polymorphism and vascular response.

Clin Pharmacol Ther. 2004 Jun;75(6):539-45.

PubMed ID
15179408 [ View in PubMed
]
Abstract

OBJECTIVE: The alpha(1A)-adrenergic receptor is highly expressed in human vasculature including resistance arteries and veins, and its stimulation is primarily responsible for adrenergically mediated smooth muscle contraction. Variability in sensitivity to phenylephrine, an alpha(1A) adrenergic agonist, has a large genetic component. We examined the hypothesis that a common polymorphism of alpha(1A)-adrenergic receptor (Arg347Cys) affects in vivo response. METHODS: We measured vascular sensitivity to phenylephrine using the dorsal hand vein linear variable differential transformer technique and determined alpha(1A)-adrenergic receptor genotype in 74 healthy, nonsmoking adults (28 Arg/Arg, 30 Arg/Cys, and 16 Cys/Cys). RESULTS: Sensitivity to phenylephrine, expressed as the dose of phenylephrine resulting in 50% venoconstriction (Phe(50)), was not significantly different in subjects with the 3 alpha(1A) adrenergic receptor genotypes: Phe(50) geometric mean (95% confidence interval) was 513 ng/min (287-918 ng/min) for Arg/Arg, 431 ng/min (274-680 ng/min) for Arg/Cys, and 471 ng/min (197-1124 ng/min) for Cys/Cys (P =.90). CONCLUSION: We conclude that the Arg347Cys receptor polymorphism does not alter agonist-mediated venoconstriction in vivo.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Alpha-1A adrenergic receptorP35348Details