Destruction of articular cartilage by arthritic synovium in vitro: Mechaniss of breakdown and effect of indomethacin and prednisolone

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Abstract
Arthritic synovial tissue when cultured with normal articular cartilage induces a breakdown of articular cartilage proteoglycans. No collagen breakdown occurs unless the macroglobulins are inactivated by pretreatment with acid. Proteoglycan breakdown is most likely due to the continuous secretion of hydrolases by the synovium. A proteolytic enzyme has been found in the culture medium which has a pH optimum around 7.6, and is Ca++ dependent. Both indomethacin and hydrocortisone are inhibitors of proteoglycan breakdown.

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