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NAD(P)H oxidase p22phox gene C242T polymorphism, nitric oxide production, salt sensitivity and cardiovascular risk factors in Hispanics

Journal of Human Hypertension volume 20, pages 772–779 (2006)Cite this article

Abstract

Mutations in the NAD(P)H oxidase gene may be associated with abnormal superoxide generation, nitric oxide (NO) availability and cardiovascular diseases. We investigated the prevalence of the NAD(P)H oxidase p22phox gene C242T polymorphism, and its possible association with blood pressure, NO production, salt sensitivity and cardiovascular risk factors in Hispanics. Genotype frequencies were as follows: CC, 52.9%; CT, 40.3%; and TT, 6.8%. There were no significant differences in systolic blood pressure, diastolic blood pressure, age, weight, fasting and post-load glucose levels, LDL and HDL cholesterol, triglyceride and urinary albumin levels in subjects with CC, CT or the TT genotypes. Presence of the T allele was associated with increased salt sensitivity in women, but not in men. NO metabolite excretion was markedly decreased both in women and men with the TT genotype (CC: 868±79 μmol/day; CT: 839±75 μmol/day; TT: 534±78 μmol/day; P<0.05). In conclusion, the prevalence of the NAD(P)H oxidase p22phox gene C242T polymorphism in Venezuelans was comparable to that of Caucasians, but different from that of Chinese and Japanese. Although the T allele was not associated with cardiovascular risk factors, hyperinsulinaemia or hypertension, in women, it appeared to be a genetic susceptibility factor for salt sensitivity. Both in women and men, the p22phox gene may play a role in the genetic control of NO levels.

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Acknowledgements

This work was supported by FONACIT S1-2001000679, CDCH-06.30.4362.03, CDCH-06-10.4214.01 and Scientific Initiative of the Millennium No. BIRF-VE. ISH and LCX were supported by the sub-project ‘Center for the Detection and Treatment of Silent Risk Factors for Cardiovascular and Metabolic Diseases' and LCX by NSU President's Faculty Scholarship Award (2002).

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Authors and Affiliations

  1. Department of Pharmaceutical Sciences, Health Professions Division, College of Pharmacy, NOVA Southeastern University (NSU), Fort Lauderdale, FL, USA

    A M Castejon, J Bracero & L X Cubeddu

  2. Division of Clinical Pharmacology Unit, School of Pharmacy, Center for the Detection and Treatment of Silent Risk Factors for Cardiovascular and Metabolic Disease, Central University of Venezuela, Caracas, Venezuela

    I S Hoffmann, A B Alfieri & L X Cubeddu

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  1. A M Castejon
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Correspondence to L X Cubeddu.

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Castejon, A., Bracero, J., Hoffmann, I. et al. NAD(P)H oxidase p22phox gene C242T polymorphism, nitric oxide production, salt sensitivity and cardiovascular risk factors in Hispanics. J Hum Hypertens 20, 772–779 (2006). https://doi.org/10.1038/sj.jhh.1002057

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