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|Title:||Insulin-like growth factor binding proteins in bovine articular and ovine growth-plate chondrocyte cultures: Their regulation by IGF's and modulation of poteoglycan synthesis|
|Citation:||Biochimica et Biophysica Acta, 1995; 1245(1):43-48|
|Sunic, Damir; Belford, David A.; McNeil, Julian D.; Wiebkin, Ole W.|
|Abstract:||Cultured chondrocytes respond to insulin-like growth factors (IGFs) by increasing the production of proteoglycans and insulin-like growth factor binding proteins (IGF-BPs). To investigate the biological effects of IGFs and IGF-BPs, isolated bovine articular and ovine growth-plate chondrocytes were cultured at high density in the presence of IGF-1, and its truncated form, des (1-3) IGF-I. Both growth factors stimulated the production of IGF-BPs in articular and growth-plate chondrocyte monolayers. Western ligand blots showed that bovine articular chondrocytes released two forms of IGF-BPs into conditioned medium with molecular weights of 29 and 31 kDa. Ovine growth-plate chondrocytes released four different forms of IGF-BPs of approx. 22, 24; 29-30 and 34 kDa. IGF-I and des (1-3) IGF-I stimulated total proteoglycan synthesis by articular chondrocytes up to 1.5-fold. The truncated analogue was more potent at lower concentrations, particularly in stimulating incorporation of newly synthesized proteoglycans into the cell-layer. The maximal stimulation of proteoglycan synthesis in ovine growth-plate chondrocyte culture was 3-fold with des (1-3) IGF-I, while IGF-I enhanced proteoglycan production by only 2-fold over the concentrations used. Our results suggest that endogenous IGF-BPs in chondrocyte cultures act as a part of a feed-back mechanism which diminishes the bioactivity of IGF-I.|
|Keywords:||Cartilage; Cells, Cultured; Animals; Cattle; Sheep; Proteoglycans; Insulin-Like Growth Factor I; Peptide Fragments; Carrier Proteins; Insulin-Like Growth Factor Binding Proteins|
|Appears in Collections:||Medicine publications|
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