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Association of bone mineral density with vitamin D receptor gene polymorphism--changes in radial bone mineral density with long-term follow-up: longitudinal study



Association of bone mineral density with vitamin D receptor gene polymorphism--changes in radial bone mineral density with long-term follow-up: longitudinal study



Rinsho Byori. Japanese Journal of Clinical Pathology 46(8): 766-773



Recent studies have shown that genetic effects on bone mineral density (BMD) and bone turnover are related to vitamin D receptor (VDR) gene polymorphism. However, discordant studies have been published and it is still not clear whether VDR genotypes influence bone mass accretion and/or postmenopausal bone loss. To assess allelic influence of the VDR gene on BMD, we determined changes in 1/6-radial-BMD by several repeat measurements in the same subjects for about ten years and analyzed VDR polymorphism of BsmI restriction enzyme in 53 normal healthy Japanese women (age: 50.3 +/- 4.7 years, mean +/- SD). Twenty-seven (age: 53.2 +/- 4.7 years) of the subjects were post-menopausal (POST group). Among these 53 subjects, the distribution of bb, Bb and BB genotypes was 64.2%, 34% and 1.9%, respectively. The genotype frequencies in this study were very similar to those in previous reports concerning other Japanese women. There was no difference between the b group (women with bb genotype) and B group (women with BB or Bb genotype) in age, body weight, height, body mass index (BMI), years since menopause, serum osteocalcin and serum alkaline phosphatase values. In the POST group, BMD of the B group at menopause was lower than that of the b group (p < 0.05). About ten years after menopause, BMD did not differ significantly between these groups because the decrease in BMD in the b group was larger than that in the B group. Regarding changes in BMD in the POST group for four years after menopause, BMD of the b group was significantly decreased compared with the B group (p < 0.01). Our findings suggest that the differences in BMD by VDR genotype were larger among pre- and pri-menopausal women and seemed to decrease with years after menopause. It is suggested that there are other factors influencing BMD and postmenopausal bone loss in elderly women.

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Accession: 045319706

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PMID: 9760828


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