납 노출자에 ALAD 및 VDR 유전자의 다형성이 혈중 납과 혈압과의 관련성에 미치는 영향 = The effect of ALAD and VDR polymorphsim on the relationship of blood lead with blood pressure in lead exposed workers

다국어 초록 (Multilingual Abstract)

To evaluate the effect of ALAD and VDR polymorphism on the relationship of blood lead with blood pressure in lead exposed workers, 801 lead exposed workers were selected.
Blood lead was selected as parameters of lead dose and systolic and diastolic blood pressure using Random Zero Sphygmomanometer were chosen as blood pressure. ALAD and VDR genotype of each subject was assayed. Demographic information such as sex, age, education, past and family history, and personal habit of smoking and drinking were collected. Job duration of lead exposed workers was also obtained.
The means of age and work duration of the subjects were 40.4±10.1 years and 8.2±6.5 years. The means of systolic blood pressure and diastolic blood pressure of the subjects were 123.2±16.3 mmHg and 75.8±11.9 mmHg. The overall prevalence of hypertension was 9.7%.
ALAD2, the variant allele, in lead exposed workers was 10% and ALAD1 was 90%. For VDR genotype, the Bb or BB genotypes were 11.2%, while the bb genotype was 88.8%. The mean blood lead of subjects was 25.4±10.9 ㎍/㎗ (range 8.0-65.6).
In the multiple regression analysis, blood lead was the significant positive predictor of systolic blood pressure and not the significant negative predictor of diastolic blood pressure after adjusting for possible confounders (age, sex, body mass index, use of anti-hypertensive drugs, drinking and smoking habits, VDR and ALAD genotypes. Also the subjects with the VDR Bx had 2.9 mmHg higher than those with the VDR bb (p=0.09). There was no interaction of VDR and ALAD genotypes between blood lead and systolic blood pressure.
In multiple logistic regression analysis, the Odd's ratio of VDR genotype(BB or Bb vs. bb) for hypertension was 1.7 (95% confidence interval: 0.8-3.2).
This study suggests that blood lead increases systolic blood pressure controlling covariates.