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Interaction of 24,25-Dihydroxyvitamin D3 and parathyroid hormone on bone enzymes in vitro

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Summary

The in vitro effects of vitamin D3 metabolites, parathyroid extract (PTE), purified parathyroid hormone (bPTH), vitamin A, and heparin on acid and alkaline phosphatases in rat or mouse calvaria in culture were investigated. Results show that: (a) when compared to values found in half calvaria incubated for 24 h in control medium, the bone acid and alkaline phosphatase content is significantly higher in paired halves incubated with PTE (1 USP/ml), bPTH (4×10−8M), heparin (5 USP/ml), vitamin A (23 USP/ml), 25-(OH)D3 (2.5×10−11 to 2.5×10−8M), 24,25-(OH)2D3, and 1,25(OH)2D3 (2.5×10−12 to 2.5×10−7M); (b) the presence of 24,25-(OH)2D3 at low concentrations in the incubation medium decreases significantly the PTE, bPTH, vitamin A, or heparin induced stimulation of the phosphatase activities. This interaction is also observed when measuringβ glucuronidase and glucose-6-phosphatase activities and45Ca release from previously labeled mouse calvaria; (c) a similar activity could not be found with 1,25-(OH)2D3 suggesting that 24,25-(OH)2D3 may have a specific role in bone metabolism.

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Authors and Affiliations

  1. Hôpital des Enfants Malades, Tour Technique 6ème étage, 149, rue de Sèvres, F-75730, Paris Cédex 15, France

    M. Lieberherr, M. Garabédian, H. Guillozo, M. Bailly du Bois & S. Balsan

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  1. M. Lieberherr
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  2. M. Garabédian
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  3. H. Guillozo
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  4. M. Bailly du Bois
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  5. S. Balsan
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Lieberherr, M., Garabédian, M., Guillozo, H. et al. Interaction of 24,25-Dihydroxyvitamin D3 and parathyroid hormone on bone enzymes in vitro. Calcif Tissue Int 27, 47–52 (1979). https://doi.org/10.1007/BF02441160

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  • DOI: https://doi.org/10.1007/BF02441160

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