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Plasma fibrinolysis in rats rose above the level of physiological fluctuations in a curve with two peaks at 1 and 6 h, following intraduodenal administration of high-molecular-weight urokinase (HMW-UK; MW 53,000; 124,000 IU/mg protein). Activation of plasma fibrinolysis was also confirmed with insolubilized enzyme (glass-coupled UK), but lacked the first activity peak. Plasma fibrinolytic enzyme isolated by affinity chromatography revealed strong fibrinolytic (1,120 IU/dl), pyro-Glu-Gly-Arg-pNA amidolytic (3,200 nmol/dl) and Glu-plasminogen activating (24.5 IU/dl) activities. Using specific UK antibody, it appeared that the first peak originated from the administered UK, while the second one derived from endogenous plasminogen activator. Dose response of UK was not observed, and the maximal effect was at about 5,000 IU/kg body weight.
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