• Meng Fan, Olli T Raitakari, Mika Kähönen, Markus Juonala, Nina Hutri-Kähönen, Jukka Marniemi, Riikka Rontu, Ilkka Pörsti, Jorma Viikari, and Terho Lehtimäki.
• Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Finland. meng.fan@uta.fi
• J. Hypertens. 2007 Jul 1; 25 (7): 1381-7.

ObjectiveNicotinamide adenine dinucleotide phosphate (NADPH) oxidase is a major source of the superoxide anion that contributes to decreased nitric oxide bioavailability in the vasculature. The C242T polymorphism of the CYBA gene that encodes p22phox, a component of NADPH oxidase, has been found to modulate superoxide production. We examined the relationship of the C242T polymorphism with endothelial-dependent brachial artery flow-mediated vasodilatation (FMD) in a population-based sample of young healthy adults.MethodsFMD, defined as the increased percentage in brachial artery diameter after reactive hyperemia, was assessed by ultrasound and the C242T polymorphism using a 5' nuclease assay in 2058 subjects aged 24-39 years.ResultsThe mean values of brachial artery FMD were 8.0 +/- 4.4% in all study subjects (n = 2058), and 7.8 +/- 4.4, 8.2 +/- 4.5, and 8.7 +/- 4.5% in subjects with the CC (n = 1362), CT (n = 616), and TT (n = 80) genotypes of the C242T CYBA polymorphism, respectively (P = 0.02 for trend). The association remained significant (P = 0.019) in multivariate analyses adjusted for age, sex, obesity indices, smoking habits, blood pressure, serum glucose, lipids, and C-reactive protein. The relationship between FMD and the C242T polymorphism was stronger (P = 0.004) in overweight subjects (body mass index > or = 25 kg/m, n = 895) and ever-smokers (P = 0.008, n = 1082), whereas no relationship was found in normal-weight subjects and non-smokers (P = 0.824 and P = 0.438, respectively).ConclusionThe C242T polymorphism of the CYBA gene seems to be related to endothelial function in a population-based sample of young healthy adults. Overweight and smoking status may modify this genetic effect.

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