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Am J Physiol Endocrinol Metab 244: E421-E424, 1983;
0193-1849/83 $5.00
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AJP - Endocrinology and Metabolism, Vol 244, Issue 4 421-E424, Copyright © 1983 by American Physiological Society

ARTICLES

Responsiveness of vitamin D-deficient fetal rat limb bones to parathyroid hormone in culture

P. H. Stern, B. P. Halloran, H. F. DeLuca and T. J. Hefley

Radii and ulnae from 19-day fetal rats from normal or vitamin D-deficient mothers were treated with 25-hydroxyvitamin D3, 1,25-dihydroxyvitamin D3, or parathyroid hormone in vitro. Both sets of bones resorbed in response to all three agents. Statistical analysis indicated a purely additive model for the effects of vitamin D status and the bone-resorbing agents, with no evidence for interaction. The results suggest that the impaired calcemic response to parathyroid hormone seen in vitamin D-deficient animals in vivo is not the result of a specific unresponsiveness of vitamin D-deficient bone to parathyroid hormone.




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