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- W2023714013 abstract "Objective: To determine whether load-induced injury causes alterations in proteoglycan (PG), stromelysin-1 (MMP-3) and collagen in articular cartilage.Methods: Mature bovine cartilage was cyclically loaded at 0.5 Hz with 1 and 5 MPa for 1, 6 and 24 h. Immediately after loading explants were evaluated for cell viability. Alterations in matrix integrity were determined by measuring PG content, PG degradation using 7D4 and 3B3(-) antibodies, broken collagen using COL2-3/4m antibody, and stromelysin-1 content using a MMP-3 antibody.Results: Mechanical load caused cell death and PG loss starting from the articular surface and increasing in depth with loading time. There was a decrease in the 7D4 epitope (native chondroitin sulfate) in the superficial zone of cartilage loaded for longer than 1 h, but an increase around chondrocytes in the deep zone. The 3B3(-) staining for degraded/abnormal chondroitin-4-sulfate neoepitope appeared only in cartilage loaded under the most severe condition (5 MPa, 24 h). The elevation of stromelysin-1 was co-localized with broken collagen (COL2-3/4m) at the articular surface in explants loaded with 1 and 5 MPa for 24 h.Conclusions: Cell death and PG loss occurred within 6 h of cyclic loading. The elevation of MMP-3 following cell death was consistently found in the superficial zone of loaded cartilage. Since MMP-3 can degrade PG and super-activate procollagenase, the increase of MMP-3 can therefore induce matrix degradation and PG depletion in mechanically injured articular cartilage, both of which are important to the development of osteoarthritis." @default.
- W2023714013 created "2016-06-24" @default.
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- W2023714013 date "2004-06-01" @default.
- W2023714013 modified "2023-10-10" @default.
- W2023714013 title "Increased stromelysin-1 (MMP-3), proteoglycan degradation (3B3- and 7D4) and collagen damage in cyclically load-injured articular cartilage" @default.
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- W2023714013 doi "https://doi.org/10.1016/j.joca.2004.02.012" @default.
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