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1,25 Dihydroxyvitamin D3 affects calmodulin distribution among subcellular fractions of skeletal muscle

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Summary

1,25 Dihydroxyvitamin D3 has been shown to stimulate calcium fluxes across skeletal muscle membranes. The involvement of calmodulin in the effects of the metabolite was investigated. Primary cultures of chick embryo skeletal muscle myoblasts and soleus muscles from vitamin D-deficient or 1,25 (OH)2D3-treated chicks were used. Culture of myoblasts and vitamin D-deficient soleus with 1,25 (OH)2D3 (0.05 ng/ml) for 24 and 1 hour, respectively, significantly increased45Ca uptake by the preparations. In the presence of the calmodulin antagonists flufenazine or compound 48/80 in the uptake medium, no differences between control and treated cultures were observed. The calmodulin content of myoblasts and soleus homogenates and subcellular fractions derived therefrom was estimated by measuring their capacity to stimulate calmodulin-depleted cAMP phosphodiesterase. No changes in total calmodulin cellular content could be detected in response to 1,25(OH)2D3. However, the sterol produced an increase in calmodulin levels of microsomes, mitochondria, and crude myofibrillar fraction and a proportional decrease in cytosolic calmodulin concentration. The 1,25(OH)2D3-dependent changes in calmodulin distribution among subcellular fractions of soleus muscle were observed eitherin vivo orin vitro. The effectsin vitro were already detectable after 5 minutes of treatment with the sterol and parallel 1,25(OH)2D3-dependent changes in tissue Ca uptake. The results suggest that changes in calmodulin intracellular distribution may underly part of the mechanism by which 1,25(OH)2D3 affects muscle calcium transport.

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Authors and Affiliations

  1. Departmento de Biología, Universidad Nacional del Sur, 8000, Bahía Blanca, Argentina

    Ana R. de Boland, Virginia Massheimer & Luis M. Fernandez

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  1. Ana R. de Boland
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  2. Virginia Massheimer
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  3. Luis M. Fernandez
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de Boland, A.R., Massheimer, V. & Fernandez, L.M. 1,25 Dihydroxyvitamin D3 affects calmodulin distribution among subcellular fractions of skeletal muscle. Calcif Tissue Int 43, 370–375 (1988). https://doi.org/10.1007/BF02553281

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  • DOI: https://doi.org/10.1007/BF02553281

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