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- W2015454324 abstract "Human growth hormone (hGH) and human insulin-like growth factor-I (hIGF-I) are known to have a marked influence on osteoclastic formation and bone resorption in an unfractionated rabbit bone cell model. This study investigated the effects of both of these factors on the induction of cysteine-proteinases and matrix metalloproteinase-2 (MMP-2) and MMP-9. After 4 days of rabbit bone cell culture, hGH and hIGF-I significantly modulated cathepsin, MMP-9 (latent form) and MMP-2 (active form) activities. Similar studies were performed in the presence of parathyroid hormone (hPTH). hPTH increased MMP-2 and MMP-9 activities whereas it had no effect on the production of cathepsins by bone cells. When neutralizing anti-hIGF-1 antiserum was added to the culture, the stimulatory effects of hGH were totally abolished, indicating that hGH-modulated cathepsin and metalloproteinase activities were partly mediated by local hIGF-I secretion. Cysteine-proteinase activities released by purified osteoclasts were very low and were not modulated by hGH and h-IGF-I. However, hIGF-I but not hGH increased MMP-2 and MMP-9 activities released by purified osteoclasts. It may be concluded that hGH markedly stimulates the expression of proteinases in total rabbit bone cells via local hIGF-I production by stromal cells. Cysteine-proteinase activities are mainly produced by non-osteoclastic cells, while MMP-2 and MMP-9 modulated by hIGF-I are mainly expressed by osteoclastic cells." @default.
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- W2015454324 date "2000-02-01" @default.
- W2015454324 modified "2023-09-27" @default.
- W2015454324 title "Human Growth Hormone Stimulates Proteinase Activities of Rabbit Bone Cells via IGF-I" @default.
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- W2015454324 doi "https://doi.org/10.1006/bbrc.2000.2079" @default.
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