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Exp Ther Med. 2015 Sep;10(3):1039-1044. Epub 2015 Jul 8.

1α,25-Dihydroxyvitamin D3 inhibits the differentiation and bone resorption by osteoclasts generated from Wistar rat bone marrow-derived macrophages.

Author information

1
College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China ; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu 225009, P.R. China.

Abstract

The steroid hormone 1α,25-dihydroxyvitamin D3 [1α,25-(OH)2D3] plays an important role in maintaining a balance in calcium and bone metabolism. To study the effects of 1α,25-(OH)2D3 on osteoclast (OC) formation and bone resorption, OC differentiation was induced in bone marrow-derived mononuclear cells from Wistar rats with the addition of macrophage colony stimulating factor and receptor activator for nuclear factor-κB ligand in vitro. Cells were then treated with 1α,25-(OH)2D3 at 10-9, 10-8 or 10-7 mol/l. OCs were identified using tartrate-resistant acid phosphatase staining and activity was monitored in the absorption lacunae by scanning electron microscopy. Expression levels of functional proteins associated with bone absorption, namely carbonic anhydrase II, cathepsin K and matrix metalloproteinase-9 were evaluated by western blot analysis. The results showed that 1α,25-(OH)2D3 inhibited the formation and activation of OCs in a dose-dependent manner and downregulated the expression levels of bone absorption-associated proteins.

KEYWORDS:

1α,25-dihydroxyvitamin D3; bone absorption; osteoclast; rat bone marrow mononuclear cells

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