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Osteopathy and resistance to vitamin D toxicity in mice null for vitamin D binding protein

Open access
Safadi, Fayez F., Thornton, Paul, Magiera, Holly, Hollis, Bruce W., Gentile, Michael, Haddad, John G., Liebhaber, Stephen A., Cooke, Nancy E.·1999·Journal of Clinical Investigation

Abstract

A line of mice deficient in vitamin D binding protein (DBP) was generated by targeted mutagenesis to establish a model for analysis of DBP's biological functions in vitamin D metabolism and action. On vitamin D-replete diets, DBP-/- mice had low levels of total serum vitamin D metabolites but were otherwise normal. When maintained on vitamin D-deficient diets for a brief period, the DBP-/-, but not DBP+/+, mice developed secondary hyperparathyroidism and the accompanying bone changes associated with vitamin D deficiency. DBP markedly prolonged the serum half-life of 25(OH)D and less dramatically prolonged the half-life of vitamin D by slowing its hepatic uptake and increasing the efficiency of its conversion to 25(OH)D in the liver. After an overload of vitamin D, DBP-/- mice were unexpectedly less susceptible to hypercalcemia and its toxic effects. Peak steady-state mRNA levels of the vitamin D-dependent calbindin-D9K gene were induced by 1,25(OH)2D more rapidly in the DBP-/- mice. Thus, the role of DBP is to maintain stable serum stores of vitamin D metabolites and modulate the rates of its bioavailability, activation, and end-organ responsiveness. These properties may have evolved to stabilize and maintain serum levels of vitamin D in environments with variable vitamin D availability.

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Crossref · 10.1172/jci5244

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Metadata

Authors
Safadi, F. F., Thornton, P., Magiera, H., Hollis, B. W., Gentile, M., Haddad, J. G., Liebhaber, S. A., & Cooke, N. E.
Venue
Journal of Clinical Investigation
Published
1999-01-15
Volume
103
Issue
2
Pages
239-251
ISSN
0021-9738 (ISSN-L)
OpenAlex
W1970536654
Cited by
402
References
1
FWCI
6.72
Type
journal article
Language
en
Open access
bronze

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