Abstract
Employing agarose gel electrophoresis, physiological concentrations of plasmin have been shown to degrade purified proteoglycan monomers and aggregates isolated from bovine articular cartilage. Proteoglycan degradation was (1) proportional to plasmin concentration, (2) dependent on the conversion of plasminogen to plasmin by plasminogen activator, (3) not displayed by plasminogen or plasminogen activator alone, and (4) inhibited by a serine proteinase inhibitor. These results, coupled with other findings, provide further support for a possible role of plasmin/plasminogen activator in cartilage destruction associated with rheumatoid arthritis.
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