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Highly purified lew molecular weight urokinase (LMR-UK), moving on SDS-PAGE (reduced and nan-reduced) as a single band of 32 kdalton, was labelled with 125I by the chlora- mine-T method. 106 cpn of this 125I-LMr-UK (94% TCA preci- pitable) were injected into the inferior vena cava of la- par atomized albino rats, which were maintained at 37°C. Blood samples were collected by cardiac puncture 5, 30 and 90 min respectively after the injection. Serun, obtained from these samples, was fractionated on a Sephadex G-100 column, calibrated with proteins of known Mr. Radioactivity was measured in the collected fractions.  In the 5 min sample, the radioactivity was distributed in 2 peaks, corresponding to 32 kdalton and to   70 kdalton peaks, but no &lt; 4 kdalton peak.  These results suggest that LMr-UK is complexed to a carrier protein, both in vivo and in vitro, but that it is degraded into small fragments in vivo only. Attempts to characterize the nature of these complexes are in progress.

Complexing of Low Mr-Weight Human Urokinase In Rat Serum And Its Degradation Into Fragments Of Very Small Molecular Weight In Vivo But Not In Vitro