PHARMACOKINETIC STUDY OF 4-METHYLUMBELLIFERONE IN MICE

概要

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The pharmacokinetic behavior of 4-methylumbelliferone (4-MU), a compound known to be excreted as conjugated metabolites, was studied in mice and the results were compared with those reported in rats. Plasma half-life of the terminal phase (t_<1/2,β>) of mice after an intravenous administration of 4-MU was approximately one-twenty fifth of that of rats. Mice showed a dose dependency in both hepatic and extrahepatic clearances, though dose dependent hepatic clearance is reported to be the main route of elimination in rats. In the same dose range (10-25 mg/kg), the hepatic intrinsic clearance per unit body weight of mice was approximately 5 times larger than that of rats. The blood-to-plasma concentration ratio and the unbound volume of distribution of tissues of mice were smaller than those of rats. It was concluded that the shorter t_<1/2,β> of mice than that of rats may be due to the larger hepatic clearance, the presence of extrahepatic clearance and the smaller volume of distribution.
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