Authors
GABRIELLE Howard, TUAN Nguyen, NIGEL Morrison, TAKAKO Watanabe, PHILIP Sambrook, JOHN Eisman, PAUL J Kelly
Publication date
1995/9/1
Journal
The Journal of Clinical Endocrinology & Metabolism
Volume
80
Issue
9
Pages
2800-2805
Publisher
Oxford University Press
Description
Common vitamin D receptor (VDR) gene alleles have recently been shown to contribute to the genetic variability in bone mass and bone turnover, however, the physiological mechanisms involved are unknown. To examine this, the response to 7 days of 2 micrograms oral 1,25-dihydroxyvitamin D[1,25-(OH)2D] (calcitriol) stimulation was assessed in 21 premenopausal women, homozygous for one or other of the common VDR alleles (bb, n = 11; BB, n = 10). Indices of bone turnover and calcium homeostasis were measured during 2 weeks. Baseline osteocalcin, 1,25-(OH)2D, type I collagen carboxyterminal telopeptide, and inorganic phosphate levels were significantly higher and spinal bone mineral density was significantly lower in the BB allelic group. After calcitriol administration, similar levels of 1,25-(OH)2D were attained throughout the study in both genotypic groups. The increase in serum osteocalcin …
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G Howard, T Nguyen, N Morrison, T Watanabe… - The Journal of Clinical Endocrinology & Metabolism, 1995