Amniotic fluid inhibited the fibrinolytic, amidolytic and esterolytic activity of
urokinase. Kinetic studies with AGLMe demonstrated non-competitive inhibition. A major
part of the inhibitory activity could be separated from α1-antitrypsin by ion-exchange chromatography on DEAE-Sephadex A-50. Plasminogen activator
prepared from porcine heart was not inhibited by amniotic fluid. Amniotic fluid also
inhibited the caseinolytic and amidolytic activities of plasmin.
Key words
Amniotic fluid - Inhibitors of urokinase - Inhibition of fibrinolysis