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Effects of vitamin D on calcium regulation in vitamin-D-deficient pigs given a phytate-phosphorus diet

Published online by Cambridge University Press:  09 March 2007

A. Pointillart ,
Nicole Fontaine  and
Monique Thomasset
A. Pointillart
Affiliation:
Station de Recherches de Nutrition, INRA, 78 350 Jouy-en-Josas, France
Nicole Fontaine
Affiliation:
Station de Recherches de Nutrition, INRA, 78 350 Jouy-en-Josas, France
Monique Thomasset
Affiliation:
INSERM, Unité 120, 78 I I0 Le Vesinet, France
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Abstract

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1.Vitamin-D-deficient pigs were fed on a phytate-phosphorus diet and treated with vitamin D, (+D) to examine the time-course of adaptative changes in plasma minerals, vitamin D metabolites, parathyroid hormone (PTH) and calcium balance and intestinal Ca-binding protein (CaBP).

2. The 5-week vitamin D repletion (25 μg cholecalciferol/kg diet) regimen restored plasma Ca, P and alkaline phosphatase (EC 3.1.3.1) to normal, decreased PTH and markedly and rapidly increased plasma 25- hydroxycholecalciferol (25-OHD, sevenfold after 4 d) and 1, 25-dihydroxycholecalciferol ( 1, 25(OH)2D3, 1.8-fold after 4 d).

3. CaBP concentrations were markedly elevated all along the digestive tract, especially in the distal regions.

4. Ca absorption and retention were enhanced (fourfold and sixfold respectively) by the +D diet.

5. The improved Ca absorption, coupled with increased CaBP and 1, 25(OH)2D3 levels, suggest that vitamin D metabolism in phytate-P-fed pigs is sensitive to the depressed Ca availability due to phytate feeding. It also indicates that CaBP may play an important role in the adaptation of Ca absorption.

6. Persistent hypercalciuria indicates that mineral metabolism was still affected by the phytate nature of the dietary P in spite of the vitamin D treatment.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 56 , Issue 3 , November 1986 , pp. 661 - 669
Copyright
Copyright © The Nutrition Society 1986

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