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Am J Physiol Endocrinol Metab 236: E556-E561, 1979;
0193-1849/79 $5.00
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AJP: Endocrinology and Metabolism, Vol 236, Issue 5, E556-E561
Copyright © 1979 by American Physiological Society

ARTICLES

Calcium absorption and intestinal calcium-binding protein: quantitative relationship

JJ Feher and RH Wasserman

The concentration of the vitamin D-induced calcium-binding protein (CaBP) and calcium absorption from the duodenum were investigated in chicks with an in vivo ligated-loop technique. The relation between CaBP and calcium absorption was dependent on a) source of vitamin D activity (either vitamin D3 or 1,25-dihydroxycholecalciferol); b) dosage of vitamin D3; c) time after administration of vitamin D3 to rachitic animals. To aid in the interpretation of these results, a phenomenological model was developed in which CaBP was viewed as being linearly related to a portion of calcium absorption. The model, when applied to the data, suggests that there is a "nonfunctional" pool of CaBP the size of which is determined by the vitamin D status of the animal. After correction for this nonfunctional pool, the proportionality between CaBP and calcium absorption is independent of the vitamin D status of the animal.


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[Abstract] [Full Text] [PDF]


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