title: Genetic variation in cytochrome P450 2J2 and soluble epoxide hydrolase and risk of ischemic stroke in a Chinese population.
abstract: OBJECTIVE
  Epoxyeicosatrienoic acids have been recognized for their protective effects on the cardiovascular system. This study investigated whether two common polymorphisms in genes believed to be influential in regulating circulating levels of epoxyeicosatrienoic acids, namely cytochrome P450 2J2 (CYP2J2) G-50T and soluble epoxide hydrolase (EPHX2) G860A, were associated with ischemic stroke risk in a Chinese population.
  
  
  RESULTS
  Screening of 200 patients with ischemic stroke and 350 control participants revealed that CYP2J2-50T allele frequency was not significantly different in ischemic stroke cases versus controls. In contrast, EPHX2 860A allele frequency was 16.8% in ischemic stroke cases versus 21.7% in controls (P=0.047), and the presence of this variant allele was associated with a significantly lower risk of ischemic stroke after adjustment for sex, age and multiple cardiovascular risk factors (adjusted odds ratio=0.50, 95% confidence interval 0.29-0.86). Moreover, there was a significant interaction between the EPHX2 G860A polymorphism, smoking and ischemic stroke risk such that nonsmokers carrying the EPHX2 G860A variant allele were at the lowest risk of ischemic stroke (odds ratio=0.33, 95% confidence interval, 0.17-0.67, P=0.002), whereas no significant association was observed in smokers.
  
  
  CONCLUSIONS
  Collectively, these data indicate a protective influence of the G860A polymorphism of EPHX2 on ischemic stroke in Chinese nonsmokers.
authors.affiliation: Department of Internal Medicine, The Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
authors.forename: Laxi
authors.initials: L
authors.lastname: Zhang
authors.forename: Hu
authors.initials: H
authors.lastname: Ding
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Yan
authors.forename: Rutai
authors.initials: R
authors.lastname: Hui
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Grace E
authors.initials: GE
authors.lastname: Kissling
authors.forename: Darryl C
authors.initials: DC
authors.lastname: Zeldin
authors.forename: Dao Wen
authors.initials: DW
authors.lastname: Wang
mesh_terms: D001483:Base Sequence; D002681:China; D000090762:Cytochrome P-450 CYP2J2; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D017931:DNA Primers; D004851:Epoxide Hydrolases / Q000235:genetics*; D005260:Female; D014644:Genetic Variation; D005828:Genetics, Population; D006801:Humans; D008297:Male; D008875:Middle Aged; D020521:Stroke / Q000201:enzymology / Q000235:genetics*
chemical_list: C000717350:CYP2J2 protein, human; D017931:DNA Primers; D003577:Cytochrome P-450 Enzyme System; D000090762:Cytochrome P-450 CYP2J2; D004851:Epoxide Hydrolases