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• W2022087872 endingPage "276" @default.
• W2022087872 startingPage "264" @default.
• W2022087872 abstract "The participation of collagenase in bone resorption has been investigated by assaying the procollagenase extracted from fetal mouse calvaria cultured under a variety of conditions, and by evaluating its ability to degrade bone collagen. Procollagenase was found in two separate pools, one requiring demineralization for its extraction, the other not. Culturing the bones with PTH, 1,25-dihydroxyvitamin D3, prostaglandin E2, interleukin-1, tumor necrosis factor-alpha, catabolin, retinoic acid, or endotoxin (but not with heparin) induced resorption, enhanced lysosomal enzyme release, and markedly increased the procollagenase content of the second pool. The PTH-induced increase in procollagenase was dose dependent and paralleled the extent of calcium loss and lysosomal enzyme release. The increase in procollagenase was found in bone, periosteum, and sutures, where its distribution was similar to that of nonmineralized collagen. The increase in procollagenase was abolished by cycloheximide, but not by indomethacin, hydroxyurea, glucocorticoids, acetazolamide, bisphosphonates, or calcitonin. Calcitonin and bisphosphonates almost completely inhibited the PTH-induced Ca loss and lysosomal enzyme release, but only partially inhibited the PTH-induced loss of collagen. The latter was, however, completely prevented by the collagenase inhibitor, CI-1. CI-1 also partially inhibited the PTH-induced Ca loss. Moreover, collagen degradation occurred in PTH-precultured calvaria (but not in noncultured controls) when incubated in a buffer under nonviable and nondemineralizing conditions. This degradation was inhibited by collagenase inhibitors, either CI-1 or the natural tissue inhibitor of metalloproteinases. This work thus indicates that the resorption of fetal bone explants proceeds along with an accumulation of procollagenase, primarily within their nonmineralized matrix. Moreover the results suggest that collagenase is likely to participate in the degradation of the nonmineralized collagen of the bone explants. Whether it also participates in the degradation of the collagen of the mineralized matrix remains to be elucidated." @default.
• W2022087872 created "2016-06-24" @default.
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• W2022087872 date "1988-07-01" @default.
• W2022087872 modified "2023-09-23" @default.
• W2022087872 title "Bone-Resorbing Agents Affect the Production and Distribution of Procollagenase as well as the Activity of Collagenase in Bone Tissue*" @default.
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• W2022087872 doi "https://doi.org/10.1210/endo-123-1-264" @default.
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