title: Beta-adrenergic receptor gene polymorphisms and cardiovascular reactivity to stress in Black adolescents and young adults.
abstract: Cardiovascular reactivity to stress and beta-adrenergic receptor (beta-AR) function may contribute to the development of hypertension. As Black Americans have an increased risk of hypertension, we evaluated associations between beta(1)-AR (Arg389Gly) and beta(2)-AR (Arg16Gly, Gln27Glu) gene variants and cardiovascular reactivity in 500 Black youth. Heart rate, preejection period, total peripheral resistance, and blood pressure reactivity were measured during cold and psychological stress. The Arg389Gly polymorphism in the beta(1)-AR was associated with preejection period reactivity in males but not in females. The Arg16Gly polymorphism in the beta(2)-AR was associated with diastolic blood pressure reactivity only during video game stress. An association between the Gln27Glu polymorphism in the beta(2)-AR and vascular reactivity depended on sex. Thus, specific patterns of associations emerged between genetic variations in beta-ARs and cardiovascular reactivity in young Blacks.
authors.affiliation: Department of Pediatrics, University of Tennessee Health Science Center, Memphis, Tennessee 38105, USA. rkelsey@uthsc.edu
authors.forename: Robert M
authors.initials: RM
authors.lastname: Kelsey
authors.forename: Bruce S
authors.initials: BS
authors.lastname: Alpert
authors.forename: Mary K
authors.initials: MK
authors.lastname: Dahmer
authors.forename: Julia
authors.initials: J
authors.lastname: Krushkal
authors.forename: Michael W
authors.initials: MW
authors.lastname: Quasney
mesh_terms: D000293:Adolescent; D044383:Black People; D001794:Blood Pressure / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena / Q000235:genetics*; D003080:Cold Temperature; D005260:Female; D056726:Genetic Association Studies; D006728:Hormones / Q000097:blood; D006801:Humans; D008297:Male; D011110:Polymorphism, Genetic / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011943:Receptors, Adrenergic, beta / Q000235:genetics*; D018342:Receptors, Adrenergic, beta-1 / Q000235:genetics / Q000502:physiology; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics / Q000502:physiology; D022702:Receptors, Adrenergic, beta-3 / Q000235:genetics / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013315:Stress, Psychological / Q000235:genetics* / Q000503:physiopathology; D055815:Young Adult; D001741:Black or African American
chemical_list: D006728:Hormones; D011943:Receptors, Adrenergic, beta; D018342:Receptors, Adrenergic, beta-1; D018343:Receptors, Adrenergic, beta-2; D022702:Receptors, Adrenergic, beta-3