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• W2000669966 abstract "Previously we have shown that transforming growth factor beta (TGF beta) 1, basic fibroblast growth factor (FGF), and platelet-derived growth factor (PDGF) BB inhibit the synthesis of insulin-like growth factor (IGF) II, but their effects on IGF binding protein (IGFBP)-6 in osteoblast cultures are not known. IGFBP-6 binds IGF II with high affinity and prevents IGF II-mediated effects, so that a possible mode of regulating the IGF II available to bone cells would be by changing the levels of IGFBP-6. To enhance our understanding of the actions of growth factors on the IGF II axis in bone, we tested the effects of TGF beta 1, basic FGF, PDGF BB, IGF I, and IGF II on the expression of IGFBP-6 in cultures of osteoblast-enriched cells from 22 day fetal rat calvariae (Ob cells). Treatment of Ob cells with TGF beta 1 caused a time- and dose-dependent decrease in IGFBP-6 mRNA levels, as determined by Northern blot analysis. The effect was maximal after 48 h and observed with TGF beta 1 concentrations of 0.04 nM and higher. TGF beta 1 also decreased IGFBP-6 polypeptide levels in the medium, as determined by Western immunoblot analysis. Cycloheximide at 3.6 microM decreased IGFBP-6 transcripts and prevented the effect of TGF beta 1. The decay of IGFBP-6 mRNA in transcriptionally arrested Ob cells was not modified by TGF beta 1. In addition, TGF beta 1 decreased the rates of IGFBP-6 transcription as determined by a nuclear run-on assay. In contrast, basic FGF, PDGF BB, IGF I, and IGF II did not change IGFBP-6 mRNA levels in Ob cells. In conclusion, TGF beta 1 inhibits IGFBP-6 expression in Ob cells by transcriptional mechanisms. Since IGFBP-6 binds IGF II and prevents its effects on bone cells, decreased synthesis of IGFBP-6 induced by TGF beta 1 could be a local feedback mechanism to increase the amount of IGF II available in the bone microenvironment." @default.
• W2000669966 created "2016-06-24" @default.
• W2000669966 creator A5004430702 @default.
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• W2000669966 date "1997-07-01" @default.
• W2000669966 modified "2023-09-27" @default.
• W2000669966 title "Growth factor regulation of insulin-like growth factor binding protein-6 expression in osteoblasts" @default.
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• W2000669966 doi "https://doi.org/10.1002/(sici)1097-4644(19970701)66:1<77::aid-jcb9>3.0.co;2-v" @default.
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