Glucocorticoid regulation of osteoclast differentiation and expression of receptor activator of nuclear factor-kappaB (NF-kappaB) ligand, osteoprotegerin, and receptor activator of NF-kappaB in mouse calvarial bones

Endocrinology
Charlotte SwansonUlf H Lerner

Abstract

In the present study, dexamethasone treatment of neonatal mouse calvarial bones increased mRNA expression of tartrate-resistant acid phosphatase, calcitonin receptor (CTR), cathepsin K, carbonic anhydrase II, osteoprotegerin (OPG), and receptor activator of nuclear factor-kappaB (RANK) as well as mRNA and protein expression of RANK ligand (RANKL). The increase in OPG mRNA noted with dexamethasone was in contrast to 1,25(OH)(2)-vitamin D3 (D3) treatment, which decreased OPG expression. Stimulation of (45)Ca release by dexamethasone and hydrocortisone in calvariae was blocked by OPG. Stimulation of RANKL, RANK, OPG, and CTR mRNA expression by dexamethasone in calvariae was blocked by the glucocorticoid receptor antagonist RU 38,486. Greater than additive potentiations of CTR mRNA and RANKL mRNA and protein were observed when D3 and dexamethasone were combined. Vitamin D receptor mRNA was increased by dexamethasone and D3, whereas glucocorticoid receptor (GR) mRNA was decreased by dexamethasone and unaffected by D3. No synergistic interaction between dexamethasone and D3 on either vitamin D receptor or GR mRNA expression was noted. The data demonstrate that dexamethasone-induced bone resorption in calvarial bones is associated wit...Continue Reading

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