Genetic Variation Within Adrenergic Pathways Determines In Vivo Effects of Presynaptic Stimulation in Humans

Author:

Fung Maple M.1,Nguyen Carie1,Mehtani Parag1,Salem Rany M.1,Perez Brandon1,Thomas Brenda1,Das Madhusudan1,Schork Nicholas J.1,Mahata Sushil K.1,Ziegler Michael G.1,O’Connor Daniel T.1

Affiliation:

1. From the Department of Medicine, Division of Nephrology-Hypertension, University of California, San Diego, La Jolla, Calif, and the Veterans Affairs San Diego Healthcare System, San Diego, Calif.

Abstract

Background— Catecholamines govern stress blood pressure responses. Catecholaminergic responses may be partially genetic and contribute to the complex heritability of hypertension. Methods and Results— To evaluate catecholaminergic responses without systemic counterregulation, we infused graded concentrations of tyramine, an indirect presynaptic norepinephrine releaser, into dorsal hand veins of 49 normotensive men and women of 5 ethnicities. Vascular responses were coupled to common (minor allele frequency >10%) single-nucleotide polymorphisms at adrenergic target loci within presynaptic pathways. Significance was set at P <0.003 after Bonferroni correction. Generalized analysis of molecular variance (GAMOVA) was performed to determine whether genetic admixture contributed to results. Venoconstriction progressed to 47% with increasing concentrations of tyramine (0.129 to 25.8 mmol/L; P <0.001). Family history of hypertension ( P <0.001) and female sex ( P =0.02) predicted blunted tyramine responses. Two genetic loci significantly predicted vascular response: chromogranin B, which encodes a protein that catalyzes catecholamine vesicle formation ( CHGB , exon 4, Glu348Glu; P =0.002), and cytochrome b-561 ( CYB561 , intron 1, C719G; P <0.001), an electron shuttle for catecholamine synthesis. Stepwise regression suggested important effects for the CHGB locus, with polymorphisms for the vacuolar-ATPase β-subunit ( ATP6V1B1 , exon 1, Ile30Thr) and flavin-containing monooxygenase-3 ( FMO3 , exon 3, Lys158Glu, P =0.002). GAMOVA did not show a significant relationship between overall genetic profile and hand-vein constriction ( P =0.29), which indicates that population stratification did not contribute to this phenotype. Conclusions— Locally infused tyramine produced dose-dependent pressor responses, predicted by family history of hypertension, sex, and genetic variants at loci, particularly CHGB , that encode the biosynthesis, storage, and metabolism of catecholamines. Such variants may influence the complex heritability of adrenergic responses and perhaps hypertension.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Physiology (medical),Cardiology and Cardiovascular Medicine

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3