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In Vitro Enhancement of AA‐Degrading Activity in Human Plasma with the Plasminogen Activator Streptokinase

Radiolabelled protein AA was coupled to cyanogen‐bromide‐activated Sepharose 6 MB and used as a substrate to determine the AA‐degrading activity of enzymes in solution. The applicability of the substrate was tested with an elastase preparation known to have AA‐degrading activity. The substrate was used to determine the AA‐degrading activity in fractions of normal human serum in the presence and absence of the plasminogen activator streptokinase. The AA‐degrading activity was increased in fractions in which streptokinase‐induced plasminogen activation had occurred. The increase in activity could be inhibited with antibodies to plasminogen. AA‐degrading activity could also be increased in whole human plasma by the addition of streptokinase.