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Effects of vitamin D metabolites and analogs on bone collagen synthesis in vitro

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Summary

The effects of selected vitamin D3 metabolites and analogs on bone collagen synthesis in vitro were examined in organ cultures of neonatal mouse calvarial bone. The incorporation of [3H]proline into the collagenase-digestible fraction of newly synthesized protein was progressively inhibited by 1α,25-dihydroxyvitamin D3 (1α,25-(OH)2D3) (10−12 M to 10−7 M) in 24-h cultures, and incorporation into noncollagen protein was also blunted at the higher doses employed. The synthetic analog 1α-hydroxyvitamin D3 (1α-OHD3) was almost 300-fold less potent an inhibitor of collagen synthesis than was 1α,25(OH)2D3, and the natural metabolites 25-hydroxyvitamin D3 (25OHD3) and 24R,25-dihydroxyvitamin D3 (24R,25(OH)2D3), 1000-fold less potent, although the dose-response curve for each of these compounds was not parallel with that for 1α,25(OH)2D3. The 24S,25(OH)2D3 enantiomer was four-fold less potent than 24R,25-(OH)2D3 or 25OHD3, and vitamin D3 showed less than 2% the activity of 25OHD3. The responses were unaffected by the substitution of 0.4% bovine albumin for 5% horse serum in the medium, and no stimulation of collagen synthesis was observed in response to 25-hydroxylated metabolites between 2×10−14 and 2×10−6 M or in cultures treated for up to 96 h with 24R,25(OH)2D3 (2×10−10M).

The overall results emphasize the similarity of the structural requirements for the inhibition of matrix synthesis and the stimulation of resorption by active vitamin D metabolites in bone. In addition, these studies support the importance of the 1-hydroxyl function to the biologic activity of vitamin D in the skeleton.

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  1. Department of Medicine, Harvard Medical School, and Endocrine Unit, Massachusetts General Hospital, 02114, Boston, Massachusetts, USA

    F. Richard Bringhurst & John T. Potts Jr.

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Bringhurst, F.R., Potts, J.T. Effects of vitamin D metabolites and analogs on bone collagen synthesis in vitro. Calcif Tissue Int 34, 103–110 (1982). https://doi.org/10.1007/BF02411216

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