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Calcium absorption and the vitamin D3-dependent calcium-binding protein

I. Inhibition by dietary strontium

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Abstract

Normal 2-week-old chicks, when fed a low-calcium (0.1%), vitamin D3-replete diet containig stable strontium at a level equimolar to 1.2% calcium, developed a severe rachiticlike condition within 7 days. Whereas formerly it was suspected that “strontium rickets” resulted from direct inhibition of calcification only, it was shown that, preceding any detectable bone change, strontium inhibited vitamin D3-induced CaBP production and, simultaneously, the intestinal calcium absorptive mechanism. The results suggest the possibility that this effect of strontium may be due to its interference with the normal mechanism of calcium regulation of CaBP synthesis.

Résumé

Des poulets normaux, âgés de 2 semaines, présentent une condition voisine d'une rachitisme grave, lorsqu'on les soumet pendant 7 jours à un régime pauvre en calcium (0,1%), riche en vitamine D3, et contenant une quantité stable de strontium, équimolaire à 1,2% de calcium. Alors que l'on pensait que le rachitisme induit par le strontium était lié à une inhibition directe de la calcification, il apparait qu'avant toute modification osseuse apparente, le strontium inhibe la production du CaPB induit par la vitamine D3, ainsi que le mécanisme d'absorption intestinale du calcium. Il semble que cet effet du strontium soit lié à sa participation dans le mécanisme normal de la régulation du calcium au cours de la synthèse de CaBP.

Zusammenfassung

Normale, 2wöchige Kücken gerieten innerhalb von 7 Tagen in einen schweren, rachitisänhlichen Zustand, wenn sie eine calciumarme (0,1%0 und Vitamin D3-reiche Nahrung erhielten, welcher kaltes Strontium in einer Konzentration von 2,62% (molaraequivalent mit 1,2% Calcium) zugesetzt wurde. Während man früher vermutete, daß die “Strontium-Rachitis” nur durch eine direkte Inhibition der Verkalkung entstehe, konnte nun gezeigt werden, daß — bevor eine sichtbare Knochenveränderung eintritt — die Vitamin D3-gesteuerte Bildung von CaBP (calciumbindendes Protein) und gleichzeitig der Mechanismus der Calciumabsorption im Darm durch Strontium gehemmt wird. Die gefundenen Resultate weisen auf die Möglichkeit hin, daß dieser Strontiumeffekt auf dessen Interferenz mit dem normalen Mechanismus der Calciumregulation durch die CaBP-Syntheses zurückgeführt werden kann.

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Authors and Affiliations

  1. Department of Physical Biology, New York State Verterinary College, Cornell University Ithaca, 14850, Ithaca, N. Y., U.S.A.

    R. A. Corradino, J. G. Ebel, P. H. Craig, A. N. Taylor & R. H. Wasserman

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  1. R. A. Corradino
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  2. J. G. Ebel
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  3. P. H. Craig
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  4. A. N. Taylor
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  5. R. H. Wasserman
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Additional information

Supported by NIH Research Grants AM-04652 and AM-06271-NTN, and USAEC Cotract AT (30-1)-4039.

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Corradino, R.A., Ebel, J.G., Craig, P.H. et al. Calcium absorption and the vitamin D3-dependent calcium-binding protein. Calc. Tis Res. 7, 81–92 (1971). https://doi.org/10.1007/BF02062596

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