The C242T polymorphism of the p22phox component of NAD(P)H oxidase and vascular risk. Two case-control studies and a meta-analysis.
NAD(P)H oxidase is a prominent source of reactive oxygen species in the vasculature. Vascular NAD(P)H oxidase is comprised of several subunits, one of which, p22phox, is encoded by a gene exhibiting several allelic variants. Here the C(242)T nucleotide transition has been found to alter superoxide anion production and associated with an altered risk of coronary artery disease (CAD). We assessed the role of this variant in two case-control studies, and performed a meta-analysis of previously reported investigations relating it to vascular risk. Population I was comprised of 492 subjects with type 2 diabetes, with or without macrovascular disease, matched for age, sex, and duration of diabetes. Population II was comprised of 158 subjects with or without either CAD or cerebro-vascular disease, and matched for age, sex, smoking status, weight category and the presence of hypertension, dyslipidemia, and diabetes. Our findings were meta-analyzed together with additional studies retrieved from the literature. The C(242)T polymorphism distribution did not differ between cases and controls in populations I and II both at univariate and multivariate analyses, and this was confirmed in a meta-analysis with 11 previously published populations. The meta-analysis, however, suggested a protective role of the T allele on CAD as an end point in Asian populations. In conclusion, these data suggest a significant heterogeneity for a modulating role of the T allele in the C(242)T polymorphism of p22-phox for the occurrence of CAD across ethnicities, with the absence of a significant effect in Caucasians.
Di Castelnuovo
Augusto
A
Laboratory of Genetic and Environmental Epidemiology, Center for High Technology Research and Education in Biomedical Sciences, Catholic University, Campobasso, Italy.
Soccio
Manola
M
Iacoviello
Licia
L
Evangelista
Virgilio
V
Consoli
Agostino
A
Vanuzzo
Diego
D
Diviacco
Silvia
S
Carluccio
Marisa
M
Rignanese
Lucia
L
De Caterina
Raffaele
R
D000368:Aged; D044466:Asian People / Q000235:genetics; D002318:Cardiovascular Diseases / Q000201:enzymology / Q000208:ethnology / Q000235:genetics*; D016022:Case-Control Studies; D003324:Coronary Artery Disease / Q000201:enzymology / Q000208:ethnology / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006801:Humans; D007558:Italy; D008297:Male; D008875:Middle Aged; D019255:NADPH Oxidases / Q000235:genetics* / Q000378:metabolism; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D017382:Reactive Oxygen Species / Q000378:metabolism; D018570:Risk Assessment; D012307:Risk Factors; D044465:White People / Q000235:genetics
D017382:Reactive Oxygen Species; D019255:NADPH Oxidases; C086986:CYBA protein, human