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• W2037150123 abstract "beta2-Adrenergic receptors (beta2-ARs) are polymorphic. In vitro studies have shown that agonist-promoted down-regulation is enhanced for Arg16Gly and blunted for Gln27Glu beta2-AR variants; Thr164Ile beta2-ARs exhibit reduced responsiveness to agonist stimulation. Our objective was to determine whether beta2-AR polymorphisms affect beta2-AR-mediated venodilation in healthy subjects in vivo.We studied dilation of phenylephrine-preconstricted dorsal hand veins induced by terbutaline (50-1000 ng/min) using the Aellig hand vein technique in subjects homozygous for the 3 most common beta2-AR haplotypes (group A, Arg16Gln27Thr164 [wild type (WT)] [n = 10]; group B, Gly16Gln27Thr164 [n = 8]; and group C, Gly16Glu27Thr164 [n = 9]) and in 8 subjects heterozygous for Thr164Ile beta2-AR (group D) at baseline and after 2 weeks of treatment with oral terbutaline, 5 mg 3 times daily.Terbutaline dose-dependently dilated hand veins; sensitivity to terbutaline was 2-fold higher in haplotype group A versus group B or C; maximal dilation, however, was not haplotype-dependent. In Thr164Ile subjects terbutaline sensitivity but not maximal dilation was 4-fold lower than in WT subjects. Long-term terbutaline treatment desensitized venous beta2-AR in a haplotype-dependent manner: The extent of desensitization (reduction in maximal venodilation) was largest for haplotype A, modest for haplotype B, and almost absent for haplotype C. Long-term terbutaline treatment also desensitized venous Thr164Ile beta2-AR; after terbutaline treatment, dose-response curves for terbutaline-induced venodilation were superimposable in WT and Thr164Ile beta2-AR subjects.beta2-AR-mediated dilation of human hand veins is influenced by the 3 most common beta2-AR haplotypes and blunted in subjects heterozygous for Thr164Ile beta2-AR. Long-term terbutaline treatment desensitizes venous beta2-AR in a haplotype-dependent manner, with haplotype A (Arg16Gln27Thr164) showing greater desensitization than haplotype B (Gly16Gln27Thr164), which shows greater desensitization than haplotype C (Gly16Glu27Thr164)." @default.
• W2037150123 created "2016-06-24" @default.
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• W2037150123 date "2005-09-01" @default.
• W2037150123 modified "2023-10-17" @default.
• W2037150123 title "Human β-adrenergic receptor gene haplotypes and venodilation in vivo" @default.
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• W2037150123 doi "https://doi.org/10.1016/j.clpt.2005.06.002" @default.
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