title: ADRB2 gene variants, dual-energy x-ray absorptiometry body composition, and hypertension in Tobago men of African descent.
abstract: Classic tissue effects of β(2)-adrenergic receptor activation include skeletal muscle glycogenolysis and vascular smooth muscle relaxation, factors relevant to obesity and hypertension, respectively. In a population-based study, we examined 2 common amino acid substitutions in the β(2)-adrenergic receptor gene (ADRB2) in relation to body composition and blood pressure. A cross-sectional analysis of 1893 African-descent men living in Tobago and participating in a prostate cancer screening study was performed. Body mass index, waist circumference, blood pressure, dual-energy x-ray absorptiometry body composition, and ADRB2 (Arg16Gly; Gln27Glu) genotype were determined. Twenty-six percent were obese (body mass index ≥30 kg/m(2)), and 50% were hypertensive. ADRB2 Arg16Gly and Gln27Glu alleles were in linkage disequilibrium (D' = 0.96, r(2) = 0.15). ADRB2 16Gly-containing and 27Glu-containing genotypes were equally frequent in low, medium, and high tertiles of percentage of body fat mass (16Gly-containing genotypes: 73.4%, 74.4%, and 74.5%, P(trend) = .66; 27Glu-containing genotypes: 27.6%, 23.8%, and 25.4%, P(trend) = .39) and in normal blood pressure, prehypertensive, and hypertensive men (16Gly-containing genotypes: 73.4%, 72.8%, and 74.4%, P(trend) = .61; 27Glu-containing genotypes: 25.6%, 24.1%, and 26.7%, P(trend) = .50). In a high-obesity and high-hypertension risk population with ancestry in common with African Americans, genetic variation defined by 2 common ADRB2 amino acid substitutions was not associated with body composition or hypertension.
authors: Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, USA.
authors: Tracey Samantha
authors: TS
authors: Beason
authors: Clareann H
authors: CH
authors: Bunker
authors: Joseph M
authors: JM
authors: Zmuda
authors: John W
authors: JW
authors: Wilson
authors: Alan L
authors: AL
authors: Patrick
authors: Victor W
authors: VW
authors: Wheeler
authors: Joel L
authors: JL
authors: Weissfeld
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D044383:Black People / Q000235:genetics*; D001794:Blood Pressure / Q000235:genetics; D001823:Body Composition / Q000235:genetics*; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D006801:Humans; D006973:Hypertension / Q000235:genetics*; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology / Q000235:genetics; D011110:Polymorphism, Genetic; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics*; D014300:Trinidad and Tobago / Q000453:epidemiology; D055105:Waist Circumference / Q000235:genetics; D001741:Black or African American
chemical_list: C553443:ADRB2 protein, human; D018343:Receptors, Adrenergic, beta-2