eNOS Glu298Asp polymorphism and hypertension in a cohort study in Japanese.
BACKGROUND
Some recent case-control association studies have suggested negative and positive relationship between Glu298Asp (the substitution of aspartic acid for glutamic acid at amino acid position 298) polymorphism of the endothelial nitric oxide synthase (eNOS) gene and hypertension. To investigate whether the Glu298Asp polymorphism of the eNOS gene affects the incidence of hypertension, a retrospective cohort study was performed.


METHODS
The baseline data among Japanese workers in Shimane Prefecture, Japan, were obtained at regular health examination in 1992, and a retrospective cohort study was performed to analyze the influence of Glu298Asp polymorphism on the incidence of hypertension in 1998.


RESULTS
The incidences of Glu298Glu, Glu298Asp, and Asp298Asp genotypes in the subjects were 86.4%, 12.6% and 1.1%, respectively. The risk ratios of Glu298Asp and Asp298Asp against Glu298Glu for the incidence of hypertension by single variance analysis were 0.830 in total subjects [95% confidence interval (CI) 0.474-1.452], 0.596 in subjects 20-39 years old (95% CI; 0.207-1.717), and 0.915 in subjects 40-59 years old (95% CI; 0.464-1.805). The risk ratios of Glu298Asp and Asp298Asp against Glu298Glu for the incidence of hypertension by multiple variance analysis adjusted for sex, BMI, serum total cholesterol, serum high-density lipoprotein (HDL) cholesterol, fasting glucose, cigarette smoking, drinking habits, eating habits, and exercise in 1992 were 0.750 in total subjects (95% CI; 0.421-1.335), 0.505 in subjects 20-39 years old (95% CI; 0.170-1.496), and 0.873 in subjects 40-59 years old (95% CI; 0.434-1.757).


CONCLUSIONS
These results suggested no association between the Glu298Asp gene polymorphism and the incidence of hypertension in this selected population.
Kishimoto
Takuji
T
Division of Environmental and Preventive Medicine, Department of Social Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Tottori, Japan. tkishimo@grape.med.tottori-u.ac.jp
Misawa
Yumiko
Y
Kaetu
Akihiko
A
Nagai
Maria
M
Osaki
Yoneatsu
Y
Okamoto
Mikizoh
M
Yoshida
Soiti
S
Kurosawa
Yoichi
Y
Fukumoto
Soji
S
D000328:Adult; D017677:Age Distribution; D015331:Cohort Studies; D005260:Female; D015438:Health Behavior; D006801:Humans; D006973:Hypertension / Q000453:epidemiology* / Q000235:genetics*; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008019:Life Style; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D019001:Nitric Oxide Synthase / Q000235:genetics*; D052250:Nitric Oxide Synthase Type III; D011110:Polymorphism, Genetic / Q000235:genetics*; D012189:Retrospective Studies; D012307:Risk Factors
C496314:NOS3 protein, human; D019001:Nitric Oxide Synthase; D052250:Nitric Oxide Synthase Type III