Abstract
BACKGROUND: This study tested whether the carriage of the longevity-associated G-allele of FOXO3 SNP rs2802292 (TG/GG) protects against incident coronary artery disease (CAD) in men with hypertension. METHODS: Subjects were American men residing on Oahu having Japanese (n = 5415) or Okinawan (n = 897) ancestry and free of CAD at baseline (1965-1968) when aged 45-68 years. RESULTS: During the follow-up, there were 1 629 incident CAD cases. Adjusting for age and cardiovascular disease risk factors, the main effect Cox model showed that in men of Japanese ancestry, hypertension was a strong predictor of CAD (hazard ratio [HR] 1.61; 95% confidence interval [CI] 1.44-1.80), p < .0001), but TG/GG genotype was not associated with CAD (HR 0.92; 95% CI = 0.82-1.02; p = .11). A full Cox model showed the interaction of TG/GG with hypertension was significant (β = -0.23, p = .038). Stratified by hypertension status, TG/GG genotype TG/GG had a protective effect against CAD in each group (HR 0.83; 95% CI 0.71-0.96; p = .021 in men of Japanese heritage, and HR 0.66; 95% CI 0.43-1.01; p = .054 in men of Okinawan heritage). No association with CAD was seen in normotensive men having either Japanese (HR 1.04; 95% CI 0.89-1.22; p = .61) or Okinawan (HR 0.95; 95% CI 0.66-1.38; p = .79) heritage. CONCLUSIONS: The present prospective study found that longevity-associated FOXO3 genotype did not independently affect the risk of CAD in all men. Rather, it was associated with protection against incident CAD in men with hypertension. Hypertensive middle-aged men with FOXO3TT genotype may merit particular attention in CAD prevention programs.