Abstract
.alpha.-Tocopherol (vitamin E) inhibited the activity of urokinase on fibrin plates and on the amidolytic substrate S-2444 in a concentration- and time-dependent manner. Inhibition was not removed by dialysis. In the presence of dilutions of plasma, protein-containing fractions of gel-filtered plasma, or bovine serum albumin, the inhibition of urokinase by .alpha.-tocopherol was abolished. Urokinase activity was not inhibited by phytol, menadione or hydroquinone.

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