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• W1976242517 abstract "Abstract Objective. To determine whether surface‐adherent immunoglobulins are capable of mediating synovial fluid (SF) neutrophil degradation of proteoglycan and collagen in intact, normal human articular cartilage, and to define the respective roles of neutrophil serine proteases and metalloproteases in degrading these cartilage constituents. Methods. Pellet explants of normal human articular cartilage pretreated with bovine serum albumin (BSA) or IgG were incubated with polymorphonuclear cells suspended in SF (PMN‐SF), or with supernatants derived from neutrophils stimulated with surface‐associated IgG. Proteoglycan degradation was measured by assaying release of 35 S‐proteoglycan fragments from cartilage explants prelabeled with 35 S‐sulfate. Collagen degradation was measured by assaying hydroxyproline content in the PMN‐SF preparations or neutrophil supernatants following their incubation with unlabeled explants. Results. Significant release of both 35 S fragments and hydroxyproline was noted following incubation of PMN‐SF with IgG‐treated pellets, compared with pellets treated with BSA. IgG preparations derived from pooled normal serum or rheumatoid arthritis SF were equally efficacious in mediating PMN degradation of cartilage collagens. Explant release of 35 S fragments during incubation with PMN supernatant was completely inhibited when serine proteases were inactivated by diisopropyl fluorophosphate (DFP); however, release of 35 S fragments was enhanced when metalloprotease activity was present in the supernatant. Release of hydroxyproline during incubation of explants with PMN supernatant was comparable in the presence of DFP or EDTA, but was markedly enhanced when both serine and metalloprotease activity were present in the supernatant. Conclusion. Neutrophils in SF are capable of degrading both proteoglycans and collagens in intact human articular cartilage. Degradation of these cartilage constituents is facilitated by immunoglobulins adherent to the cartilage surface and by the synergistic action of PMN serine and metalloproteases released during activation of neutrophils with surface‐associated immunoglobulin." @default.
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• W1976242517 date "1993-01-01" @default.
• W1976242517 modified "2023-10-18" @default.
• W1976242517 title "Degradation of human articular cartilage by neutrophils in synovial fluid" @default.
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• W1976242517 doi "https://doi.org/10.1002/art.1780360109" @default.
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