The V433M variant of the CYP4F2 is associated with ischemic stroke in male Swedes beyond its effect on blood pressure.
Cytochrome (CYP) 4A11 and CYP4F2 are responsible for renal production of 20-hydroxyeicosatetraenoic acid, a vasoconstrictor and natriuretic substance. The CYP4A11 F434S and CYP4F2 V433M polymorphisms reduce 20-hydroxyeicosatetraenoic acid production in vitro. The aim of the present study was to evaluate the effect of these polymorphisms on blood pressure (BP) levels, hypertension prevalence, and risk of incident cardiovascular events in middle-aged Swedes. The polymorphisms were genotyped in the cardiovascular cohort of the Malmö Diet and Cancer Study. The incidence of cardiovascular events (coronary events, n=276; ischemic stroke, n=199) was monitored over 10 years of follow-up. The analysis of BP levels was performed twice: either excluding or including subjects under antihypertensive treatment. In the whole population, CYP4A11 S434S homozygotes had higher systolic BP, both crude and adjusted for the number of antihypertensive drugs, and higher prevalence of hypertension with respect to F434 carriers. Male, but not female, CYP4F2 M433 carriers had significantly higher crude and adjusted systolic and diastolic BPs and a trend toward higher hypertension prevalence (P=0.06) with respect to V433V homozygotes. After adjustment for major cardiovascular risk factors, the hazard ratio for incident ischemic stroke in male CYP4F2 M433 carriers was significantly higher with respect to V433V homozygotes (hazard ratio: 1.69; 95% CI: 1.10 to 2.60) even when baseline BP levels and hypertension prevalence were included in the Cox proportional hazard model. A common CYP4F2 V433M polymorphism might increase the risk of incident ischemic stroke in male subjects only partially through its elevating effect on BP. Additional studies are needed to confirm these data.
Department of Biomedical and Surgical Sciences, Division of Internal Medicine C, Piazza LA Scuro 10, 37134 Verona, Italy. cristiano.fava@med.lu.se
Cristiano
C
Fava
Martina
M
Montagnana
Peter
P
Almgren
Lena
L
Rosberg
Giuseppe
G
Lippi
Bo
B
Hedblad
Gunnar
G
Engström
Göran
G
Berglund
Pietro
P
Minuz
Olle
O
Melander
D000704:Analysis of Variance; D000886:Anthropometry; D002545:Brain Ischemia / Q000235:genetics / Q000401:mortality; D015331:Cohort Studies; D042926:Cytochrome P-450 CYP4A / Q000235:genetics*; D005260:Female; D005786:Gene Expression Regulation; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006579:Heterozygote; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000378:metabolism; D006973:Hypertension / Q000175:diagnosis / Q000235:genetics* / Q000401:mortality; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011336:Probability; D016016:Proportional Hazards Models; D012737:Sex Factors; D020521:Stroke / Q000235:genetics* / Q000401:mortality
D006893:Hydroxyeicosatetraenoic Acids; C055987:20-hydroxy-5,8,11,14-eicosatetraenoic acid; D042926:Cytochrome P-450 CYP4A