Abstract
The role of eNOS gene polymorphisms on plasma nitrite or nitrate (NOx) level, endothelial function, and blood pressure (BP) remains unclear. We estimated the relationship of eNOS polymorphisms (the T(-786)C in the 5'-flanking promoter region, T(-786)C; 27-bp repeat in intron 4, eNOS4; and Glu298Asp in exon 7, G894T) with plasma NOx level, brachial endothelial function assessed by ultrasound measure of brachial artery flow-mediated dilation (FMD), and BP in 60 healthy African Americans, 30 men and 30 women aged 18 to 73 years. Among them, 73.1%, 23.9%, and 3.0% carried TT, TC, and CC of T(-786)C, respectively, 14.5%, 27.5%, 53.6%, and 1.4% carried aa, ab, bb, and bc of eNOS4 polymorphism, respectively, and 70.4%, 23.9%, and 5.6% carried GG, GT, and TT of G894T, respectively. G894T and eNOS4 were observed in linkage disequilibrium. Mean values of age, plasma NOx, FMD, systolic and diastolic BPs were not significantly different (P >.05) by eNOS polymorphisms. Plasma NO(x) level was found to be associated with systolic BP (r = 0.51, P =.03), and diastolic BP (r = 0.41, P =.08), but not with FMD, in individuals with "a" allele of eNOS4 polymorphism after adjustment for age, body mass index, serum glucose, and smoking status. We reve...Continue Reading
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