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Effect of 1α-vitamin D3 on bone strength and composition in growing rats with and without corticosteroid treatment

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Abstract

The effects of 1α-vitamin D3 were studied for 6 months in 2-month-old male and female rats on a moderately low calcium diet with or without low-dose prednisolone treatment. Both cortical bone mechanical and biochemical properties were examined. Femoral bone specimens were subjected to torsional loading tests. With age, bone strength and stiffness increased in both sexes, accompanied by an increased degree of mineralization (bone ash and calcium concentrations). During growth, strength and stiffness increased more in male than in female rats. When 1α-vitamin D3 (0.5 μg/kg/day) was given alone, bone mechanical competence improved significantly whereas insulin-like growth factor-I (IGF-I) and calcium concentrations in the bone matrix were significantly reduced. Treatment with low-dose prednisolone (0.5 mg/kg/day) alone did not influence bone mechanical properties compared with intact control rats (without prednisolone) although a significant reduction in calcium concentration and an increased phosphorus concentration were measured. A combined therapy with prednisolone and 1α-vitamin D3 significantly increased bone strength, toughness, and stiffness compared with control bones. Both mineralization degree (ash and calcium concentration) and IGF-I concentration were decreased.

We conclude that (1) mechanical properties of rat cortical bones improve relatively more in males compared with agematched females during growth which is related to increased bone mass and size, (2) low-dose prednisolone treatment does not change mechanical properties in males, and altered them only nonsignificantly in females despite a change in mineralization degree in both sexes; (3) treatment with 1α-vitamin D3 results in a consistent increase in mechanical competence of the bone accompanied by a significant decrease in IGF-I concentration in the bone matrix.

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Authors and Affiliations

  1. Arthritis and Metabolic Bone Disease Research Unit, K. U. Leuven, U. Z. Pellenberg, Weligerveld 1, B-3212, Pellenberg, Belgium

    J. Aerssens, M. Talalaj, P. Geusens & J. Dequeker

  2. Laboratory for Biomechanics, K.U. Leuven, U.Z. Pellenberg, Weligerveld, B-3212, Pellenberg, Belgium

    R. Van Audekercke

  3. Vlaamse Instelling voor Technologisch Onderzoek, B-2400 Mol, Belgium

    P. Van Vlasselaer

  4. Department of Pharmacology, Leo Pharmaceutical Products Ltd, Ballerup, Denmark

    E. Bramm

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  1. J. Aerssens
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  7. J. Dequeker
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Aerssens, J., Van Audekercke, R., Talalaj, M. et al. Effect of 1α-vitamin D3 on bone strength and composition in growing rats with and without corticosteroid treatment. Calcif Tissue Int 55, 443–450 (1994). https://doi.org/10.1007/BF00298558

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  • DOI: https://doi.org/10.1007/BF00298558

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