Demonstration of 1,25(OH)2 vitamin D3 receptors and actions in vascular smooth muscle cells in vitro

Binding of [3H] 1,25(OH)2D3 and effects of 1,25(OH)2D3 on cell ultrastructure were evaluated in vascular smooth muscle cells (VSMC) primary cultures (aortic media). Specific reversible binding of [3H] 1,25(OH)2D3 by a 3.5 S macromolecule with DNA binding, KD 6.2 X 10(-10) M and Nmax 16 fmol/mg prote...

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Bibliographic Details
Published in:Calcified tissue international 1987-08, Vol.41 (2), p.112-114
Main Authors: MERKE, J, HOFMANN, W, GOLDSCHMIDT, D, RITZ, E
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Blood vessels and receptors
Calcitriol - metabolism
Calcitriol - pharmacology
Fundamental and applied biological sciences. Psychology
In Vitro Techniques
Male
Muscle, Smooth, Vascular - drug effects
Muscle, Smooth, Vascular - metabolism
Muscle, Smooth, Vascular - ultrastructure
Rabbits
Rats
Rats, Inbred Strains
Receptors, Calcitriol
Receptors, Steroid - metabolism
Vertebrates: cardiovascular system
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Summary:Binding of [3H] 1,25(OH)2D3 and effects of 1,25(OH)2D3 on cell ultrastructure were evaluated in vascular smooth muscle cells (VSMC) primary cultures (aortic media). Specific reversible binding of [3H] 1,25(OH)2D3 by a 3.5 S macromolecule with DNA binding, KD 6.2 X 10(-10) M and Nmax 16 fmol/mg protein was demonstrated. Incubation of VSMC with 10(-8) M 1,25(OH)2D3, but not 25(OH)D3, in the presence of 10% FCS for up to three weeks caused rapid reversible appearance in the cytoplasm of membrane-bounded electron-dense lysosomal particles which on electronspectroscopic imaging contained Ca and Pi. VSMC are targets for vitamin D.
ISSN:0171-967X
1432-0827
DOI:10.1007/BF02555253