Influence of vitamin D receptor gene polymorphisms and 25-hydroxyvitamin D on blood pressure in apparently healthy subjects.
BACKGROUND
There are no studies that relate BsmI polymorphism of the vitamin D receptor (VDR) gene and with vitamin D to blood pressure (BP).


OBJECTIVE
To analyze if this polymorphism and 25-hydroxyvitamin D levels (25OHD3) influence BP in a population of healthy subjects.


METHODS
Transversal study on healthy population. Stepwise multiple regression analysis was performed to assess the association of BP with several clinical and biochemical data.


METHODS
Industrial employees, blood donors, and army cadets from Lleida, Spain were recruited in October 2001.


METHODS
A total of 590 apparently healthy subjects (260 males and 330 females).


METHODS
Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were determined as the mean of three measurements. We also included age, gender, body mass index (BMI), serum levels of creatinine, calcium, phosphorus, intact parathyroid hormone (by two-site chemiluminometric assay), 25-hydroxyvitamin D (by radioimmunoassay) and BsmI genotype.


RESULTS
Since gender was strongly associated with both SBP and DBP, a separate analysis was performed for men and women. In males, SBP was associated with BMI, 25OHD3 (beta: 0.37, P < 0.000) and genotype (beta: -4.1, P < 0.001); and DBP with 25OHD3 (beta: 0.19, P < 0.008) and age. SBP was higher in men with bb genotype than in the other genotypes (P < 0.006). Moreover, there was a statistically significant positive correlation between 25OHD3 and both SBP (r: 0.53, P < 0.002) and DBP (r: 0.48, P < 0.005) in men with genotype BB. In women, neither 25OHD3 nor genotype were associated with BP levels.


CONCLUSIONS
BsmI polymorphism of the VDR gene influences BP in healthy men. A positive relationship between serum 25-hydroxyvitamin D levels and BP is present only in men with the BB genotype.
Service of Nephrology, Hospital Universitari Arnau de Vilanova, Lleida, Spain.
Salomé
S
Muray
Eva
E
Parisi
Anna
A
Cardús
Lourdes
L
Craver
Elvira
E
Fernández
D000328:Adult; D001794:Blood Pressure / Q000187:drug effects* / Q000235:genetics*; D015992:Body Mass Index; D003971:Diastole; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D011110:Polymorphism, Genetic / Q000502:physiology*; D018167:Receptors, Calcitriol / Q000235:genetics*; D012016:Reference Values; D012044:Regression Analysis; D012727:Sex Characteristics; D013599:Systole; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000494:pharmacology*
D018167:Receptors, Calcitriol; D014807:Vitamin D; C104450:25-hydroxyvitamin D