Key result
The T allele of the p22-phox C242T polymorphism was associated with a significantly higher left ventricular mass index compared to the CC genotype in Brazilian hypertensive patients.
Why the study?
Is the T allele of the p22-phox C242T polymorphism associated with higher left ventricular mass in hypertensive patients?
Cross-Sectional (n=561)
Yes
Is the T allele of the p22-phox C242T polymorphism associated with higher left ventricular mass in hypertensive patients?
Absolute Event Rate: 76.8% vs 70.9%
p-value: p=0.009
The T allele of the p22-phox C242T polymorphism is associated with increased left ventricular mass and NADPH-oxidase activity in hypertensive patients, suggesting a genetic modulation of hypertensive end-organ damage.
Hypothesis-generating for p22-phox C242T in hypertensive LVH; prospective studies needed before any clinical application.
BACKGROUND: Reactive oxygen species have been implicated in the physiopathogenesis of hypertensive end-organ damage. This study investigated the impact of the C242T polymorphism of the p22-phox gene (CYBA) on left ventricular structure in Brazilian hypertensive subjects. METHODS: We cross-sectionally evaluated 561 patients from 2 independent centers [Campinas (n = 441) and Vitória (n = 120)] by clinical history, physical examination, anthropometry, analysis of metabolic and echocardiography parameters as well as p22-phox C242T polymorphism genotyping. In addition, NADPH-oxidase activity was quantified in peripheral mononuclear cells from a subgroup of Campinas sample. RESULTS: Genotype frequencies in both samples were consistent with the Hardy- Weinberg equilibrium. Subjects with the T allele presented higher left ventricular mass/height2.7 than those carrying the CC genotype in Campinas (76.8 ± 1.6 vs 70.9 ± 1.4 g/m2.7; p = 0.009), and in Vitória (45.6 ± 1.9 vs 39.9 ± 1.4 g/m2.7; p = 0.023) samples. These results were confirmed by stepwise regression analyses adjusted for age, gender, blood pressure, metabolic variables and use of anti-hypertensive medications. In addition, increased NADPH-oxidase activity was detected in peripheral mononuclear cells from T allele carriers compared with CC genotype carriers (p = 0.03). CONCLUSIONS: The T allele of the p22-phox C242T polymorphism is associated with higher left ventricular mass/height 2.7 and increased NADPH-oxidase activity in Brazilian hypertensive patients. These data suggest that genetic variation within NADPH-oxidase components may modulate left ventricular remodeling in subjects with systemic hypertension.
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Schreiber et al. (2011) conducted a cross-sectional in Hypertension (n=561). T allele of the p22-phox C242T polymorphism vs. CC genotype was evaluated on Left ventricular mass index (LV mass/height^2.7) in the Campinas sample (p=0.009). The T allele of the p22-phox C242T polymorphism was associated with a significantly higher left ventricular mass index compared to the CC genotype in Brazilian hypertensive patients.
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