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Endocrinology, Vol 97, 995-999, Copyright © 1975 by Endocrine Society

ARTICLES

The mobilization of bone mineral by 1,25-dihydroxyvitamin D3 in hypophosphatemic rats

L Castillo, Y Tanaka and HF DeLuca

Administration of 1,25-dihydroxyvitamin D3 to thyroparathyroidectomized, hypophosphatemic rats on a low-phosphorus diet increases serum inorganic phosphorus and calcium concentrations. Experiments utilizing such rats treated with 45Ca and 32P ten days before use revealed that the rise in serum phosphorus in response in 1,25-dihydroxy-vitamin D3 is derived at least in part from bone mineral. This suggests that under conditions of hypophosphatemia, 1,25- dihydroxyvitamin D3 can mobilize bone in the absence of parathyroid hormone.


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