CYP2J2 and CYP2C8 polymorphisms and coronary heart disease risk: the Atherosclerosis Risk in Communities (ARIC) study.
OBJECTIVE
The cytochromes P450 epoxygenases CYP2J2 and CYP2C8 synthesize epoxyeicosatrienoic acids, which regulate endothelial function. We sought to determine if genetic variation in CYP2J2 and CYP2C8 was associated with coronary heart disease risk.


METHODS
We genotyped 2065 Atherosclerosis Risk in Communities study participants (1085 incident coronary heart disease cases, 980 noncases) for polymorphisms in CYP2J2 and CYP2C8. Using a case-cohort design, associations between genotype and incident coronary heart disease risk were evaluated using proportional hazards regression. The influence of cigarette smoking on these associations was also evaluated. False discovery rate q-values were estimated to minimize the impact of the multiple statistical comparisons completed. All analyses were race stratified.


RESULTS
The CYP2J2 G-50T polymorphism variant -50T allele was associated with significantly lower risk of incident coronary heart disease in African-Americans (adjusted hazard rate ratio 0.58, 95% confidence interval 0.35-0.96, P=0.036, q=0.051); however, no significant association was observed in Caucasians. Overall, the I264M, I269F, and K399R polymorphisms in CYP2C8 were not significantly associated with risk of incident coronary heart disease. In Caucasians, the relationship between the I264M and K399R polymorphisms and incident coronary heart disease risk was significantly modified by cigarette smoking status (P for interaction=0.008, q=0.064), with the highest risk observed in smokers carrying at least one variant allele.


CONCLUSIONS
The G-50T polymorphism in CYP2J2 may be an important risk factor for the development of coronary heart disease events in African-Americans, whereas cigarette smoking may modify the relationship between the I264M and K399R polymorphisms in CYP2C8 and coronary heart disease risk in Caucasians. Confirmation of these findings in an independent population is warranted.
Lee
Craig R
CR
Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, USA.
North
Kari E
KE
Bray
Molly S
MS
Couper
David J
DJ
Heiss
Gerardo
G
Zeldin
Darryl C
DC
D001741:Black or African American; D000483:Alleles; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D044466:Asian People; D050197:Atherosclerosis / Q000453:epidemiology / Q000235:genetics*; D016022:Case-Control Studies; D015331:Cohort Studies; D003327:Coronary Disease / Q000453:epidemiology / Q000235:genetics*; D065727:Cytochrome P-450 CYP2C8; D000090762:Cytochrome P-450 CYP2J2; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D010105:Oxygenases / Q000235:genetics*; D011110:Polymorphism, Genetic; D012307:Risk Factors; D012907:Smoking; D014481:United States / Q000453:epidemiology; D044465:White People
C000717350:CYP2J2 protein, human; D003577:Cytochrome P-450 Enzyme System; D010105:Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C450259:CYP2C8 protein, human; D065727:Cytochrome P-450 CYP2C8; D000090762:Cytochrome P-450 CYP2J2