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- W2061541261 abstract "We have used recombinant osteogenic protein-1 to investigate our hypothesis that proper repair and maintenance of cartilage requires not only enhanced biosynthesis and replenishment of the extracellular matrix but also the enhancement of components necessary for matrix retention.The effects of osteogenic protein-1 were examined on bovine articular cartilage slices as well as isolated chondrocytes grown in alginate beads. Cartilage slices were examined for accumulation of proteoglycan by incorporation of 35S-sulfate and staining using Safranin O or, a biotinylated probe specific for hyaluronan. Bovine chondrocytes were characterized by use of a particle exclusion assay, in-situ hybridization, quantitative-competitive RT-PCR and a hyaluronan-binding assay.Osteogenic protein-1 treatment substantially enhanced the accumulation of hyaluronan and proteoglycan within cartilage tissue slices. As with the tissue, osteogenic protein-1 enhanced the size of cell-associated matrices assembled and retained by chondrocytes in vitro. This enhanced matrix assembly was paralleled by an increased expression of mRNA for aggrecan, hyaluronan synthase-2 and CD44. Of the two hyaluronan synthase genes expressed by chondrocytes, only hyaluronan synthase-2 was upregulated by osteogenic protein-1. Coupled with the increase in the CD44 mRNA was an increase in functional hyaluronan binding activity present at the chondrocyte cell surface.These results demonstrate that osteogenic protein-1 stimulates not only the synthesis of the major cartilage extracellular matrix component aggrecan, but also two associated molecules necessary for the retention of aggrecan, namely hyaluronan and CD44." @default.
- W2061541261 created "2016-06-24" @default.
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- W2061541261 date "2000-03-01" @default.
- W2061541261 modified "2023-09-29" @default.
- W2061541261 title "Osteogenic protein-1 promotes the synthesis and retention of extracellular matrix within bovine articular cartilage and chondrocyte cultures" @default.
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- W2061541261 doi "https://doi.org/10.1053/joca.1999.0281" @default.
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