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KMID : 0043320060290080691
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Archives of Pharmacal Research
2006 Volume.29 No. 8 p.691 ~ p.698
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Dexamethasone Inhibits the Formation of Multinucleated Osteoclasts via Down-regulation of β3 Integrin Expression
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Kim Yong-Hee
Jun Ji-Hae
Woo Kyung-Mi
Ryoo Hyun-Mo
Kim Gwan-Shik
Baek Jeong-Hwa
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Abstract
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Although glucocorticoids are known to affect osteoclast differentiation and function, there have been conflicting reports about the effect of glucocorticoids on osteoclast formation, leading to the assumption that microenvironment and cell type influence their action. We explored the effect of the synthetic glucocorticoid analog dexamethasone on the formation of osteoclasts. Dexamethasone inhibited the formation of tartrate-resistant acid phosphatase (TRAP)-positive multinucleated osteoclasts without affecting the formation of TRAP-positive mononuclear cells in a coculture of mouse osteoblasts and bone marrow cells. Dexamethasone did not inhibit mRNA expression levels of the receptor activator of nuclear factor-kB ligand and osteoprotegerin, the essential regulators of osteoclastogenesis. Dexamethasone down-regulated the expression of β3 integrin mRNA and protein but did not alter expression of other osteoclast differentiation marker genes. Both dexamethasone and echistatin, a β3 integrin function blocker, inhibited TRAP-positive multinucleated osteoclast formation but not TRAP-positive mononuclear cell formation. These results suggest that dexamethasone inhibits the formation of multinucleated osteoclasts, at least in part, through the down-regulation of β3 integrin, which plays an important role in the formation of multinucleated osteoclasts.
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KEYWORD
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Dexamethasone, Osteoclast, Vitronectin receptor, β3 Integrin, Fusion
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