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- W2000593082 abstract "Destruction of collagen within osteoarthritic cartilage depends in part on collagen-degrading matrix metalloproteases (MMP). Degradative fragments of type II collagen (Col II) occur in normal and in osteoarthritic cartilage, and may contribute to regulation of matrix turnover by interfering with normal cell–matrix communication pathways. Therefore, the effects of different types of collagen fragments on mRNA and protein levels of MMP-2, MMP-3, MMP-9, and MMP-13 in cultured bovine articular knee chondrocytes and explants were examined. Primary chondrocytes and explants were incubated with fragments from whole cartilage collagen matrix (Colf) and from purified type II collagen (Col2f), or with a synthetic 29-mer peptide representing the amino-terminal domain of type II collagen (Ntelo). Gelatin zymography revealed increases of proMMP-2, a shift towards active MMP-2 and increases in proMMP-9, depending on the type of fragment. In situ hybridization of cartilage sections displayed MMP-3 mRNA in virtually all cells. Moderate to strong increases in MMP-2, MMP-3, MMP-9, and MMP-13 mRNA levels were detected by quantitative PCR. The results demonstrate stimulating effects of collagen fragments on both mRNA and/or protein from MMP -2, -3, -9, and -13, and suggest a novel mechanism of MMP induction and activation that includes a particular role for N-telo in controlling catabolic pathways of matrix turnover. © 2005 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res" @default.
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- W2000593082 date "1997-01-01" @default.
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- W2000593082 title "Adhesion of elastomeric impression materials to trays" @default.
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- W2000593082 doi "https://doi.org/10.1046/j.1365-2842.1997.00458.x" @default.
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