(Hypertension. 2000;36:878.)
© 2000 American Heart Association, Inc.
Scientific Contributions |
From the Department of Bioengineering, Whitaker Institute for Biomedical Engineering (F.L., G.W.S-S.), and Department of Medicine (M.T.K., D.T.OC., R.J.P.), University of California at San Diego, La Jolla; and Veterans Administration Medical Center, San Diego, Calif (M.T.K., D.T.OC., R.J.P.).
Correspondence to Robert J. Parmer, MD, Department of Medicine, Nephrology/Hypertension (9111H), University of California at San Diego, 3350 La Jolla Village Dr, San Diego, CA 92161. E-mail rparmer{at}ucsd.edu
AbstractOxygen free radicals, including hydrogen peroxide, may mediate oxidative stress in target organ tissues and contribute to cardiovascular complications in hypertension. To examine heritability of hydrogen peroxide production, we investigated this trait in a family-based cohort consisting of family members (n=236) ascertained through probands (n=57) with essential hypertension. Significant effects on hydrogen peroxide production were found for gender and ethnicity, with men having greater values than women (P<0.001) and white subjects having greater values than black subjects (P=0.025). Hydrogen peroxide production correlated directly with plasma renin activity (P=0.015), suggesting an important interaction between circulating oxygen radicals and the renin-angiotensin system and a potential mechanism for lower hydrogen peroxide values observed in blacks. Heritability estimates from familial correlations revealed that approximately 20% to 35% of the observed variance in hydrogen peroxide production could be attributed to genetic factors, suggesting a substantial heritable component to the overall determination of this trait. Hydrogen peroxide production negatively correlated with cardiac contractility (r=-0.214, P=0.001) and renal function (r=-0.194, P=0.003). In conclusion, these results indicate that hydrogen peroxide production is heritable and is related to target organ function in essential hypertension. Genetic loci influencing hydrogen peroxide production may represent logical candidates to investigate as susceptibility genes for cardiovascular target organ injury.
Key Words: genetics hypertension, essential oxygen free radicals
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