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• W2107571929 endingPage "121" @default.
• W2107571929 startingPage "114" @default.
• W2107571929 abstract "Prolonged glucocorticoid excess is associated with bone loss. Among the contributory factors are glucocorticoids' suppression of bone formation and stimulation of bone resorption. In this study, the effects of glucocorticoids on bone resorption were evaluated in a rodent model. Subcutaneous implants of devitalized mineralized bone particles (BPs) elicit the recruitment of progenitor cells and their differentiation to osteoclasts which resorb the BPs. The effects of glucocorticoids on both the recruitment and the activity of cells induced by normal BPs were distinguished based upon when treatment was initiated. When treatment with hydrocortisone or dexamethasone was initiated at the time of BP implantation, the recruitment of bone-resorbing cells was impaired and a subsequent decrease in BP resorption was found. On the other hand, when treatment was initiated on day 7, glucocorticoids increased osteoclastic resorption and tartrate-resistant acid phosphatase activity. We also tested hydrocortisone's effect to stimulate the activity of cells associated with osteocalcin-deficient BPs. As previously reported, BPs deficient in osteocalcin were poorly resorbed as a result of decreased formation and activity of osteoclasts. Hydrocortisone had an even more pronounced effect in stimulating the low level resorption of the osteocalcin-deficient BP implants than of the normal BP implants. These findings show differential effects of glucocorticoids on two aspects of bone resorption: they inhibit the recruitment and/or differentiation of bone-resorbing cells, but they stimulate the activity of existing osteoclastic cells. The ability of glucocorticoids to increase resorption of normal bone and to overcome resistance to resorption of osteocalcin-deficient bone suggests an important regulatory effect of glucocorticoids in the activation of osteoclasts to increase bone resorption." @default.
• W2107571929 created "2016-06-24" @default.
• W2107571929 creator A5031362021 @default.
• W2107571929 creator A5070880955 @default.
• W2107571929 creator A5079973191 @default.
• W2107571929 date "1992-07-01" @default.
• W2107571929 modified "2023-09-25" @default.
• W2107571929 title "Differential effects of glucocorticoid on recruitment and activity of osteoclasts induced by normal and osteocalcin-deficient bone implanted in rats." @default.
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• W2107571929 doi "https://doi.org/10.1210/endo.131.1.1611989" @default.
• W2107571929 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1611989" @default.
• W2107571929 hasPublicationYear "1992" @default.
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