Effect of 1,25(OH)2 vitamin D3 on circulating insulin-like growth factor-I and beta 2 microglobulin in patients with osteoporosis

To test the hypothesis that growth factors mediate the stimulatory effect of 1,25(OH)2 vitamin D3 [1,25(OH)2D3] on bone remodeling in osteoporosis, the authors studied the effect of the secosteroid administration in two doses (1 microgram/day and 2 micrograms/day) for 14 days on circulating insulin-...

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Bibliographic Details
Published in:Calcified tissue international 1997-03, Vol.60 (3), p.236-239
Main Authors: Zofková, I, Kancheva, R L, Bendlová, B
Format: Article
Language:English
Subjects:
beta 2-Microglobulin - biosynthesis
beta 2-Microglobulin - drug effects
Calcitriol - blood
Calcitriol - pharmacology
Calcium - blood
Female
Humans
Insulin-Like Growth Factor I - biosynthesis
Insulin-Like Growth Factor I - drug effects
Middle Aged
Osteocalcin - biosynthesis
Osteocalcin - drug effects
Osteoporosis - blood
Osteoporosis - drug therapy
Parathyroid Hormone - blood
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Summary:To test the hypothesis that growth factors mediate the stimulatory effect of 1,25(OH)2 vitamin D3 [1,25(OH)2D3] on bone remodeling in osteoporosis, the authors studied the effect of the secosteroid administration in two doses (1 microgram/day and 2 micrograms/day) for 14 days on circulating insulin-like growth factor-I (IGF-I), beta 2 microglobulin, and osteocalcin in 18 osteoporotic women. The biological effectiveness of the treatment was controlled by a decline of serum intact parathyroid hormone. Compared with the values before treatment, 1,25(OH)2D3 increased means of plasma IGF-I, beta 2 microglobulin, and serum osteocalcin significantly; however, the effects were only apparent after the higher dose of the drug (169 +/- 26 versus 134 +/- 28 ng/ml, P < 0.01; 2.08 +/- 0.1 versus 1.92 +/- 0.1 micrograms/ml, P < 0.05; and 8.5 +/- 1.3 versus 5.4 +/- 1.1 ng/ml, P < 0.01, respectively). The authors conclude that exogenous 1,25(OH)2D3 promotes the production of IGF-I and beta 2 microglobulin in osteoporotic patients in parallel to the marker of osteoblastic function, osteocalcin, which supports the tested hypothesis.
ISSN:0171-967X