Abstract
The changes of pharmacokinetics and distribution of 3H radio-labelled ribonuclease (RNase) and RNase adduct with monomethoxypoly(ethylene glycol) (MPEG) were studied after intravenous administration in the dose of 25 mg kg -1 to rats. Whereas the value of total plasma clearance of RNase is close to the value of glomerular filtration rate, the value of that for MPEG-RNase is about three hundred times lower. The half-life of elimination is 79 min, 181 min and 65 h for RNase, MPEG and MPEG-RNase, respectively. The main elimination pathway of compounds under study was elimination into urine and no evident specific distribution in the examined organs (liver, kidney, muscle, lung, brain, spleen and heart) was found. The study indicates that conjugation of RNase with MPEG can improve its pharmacokinetic properties.
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