Absorption, distribution, metabolism and excretion of a new morpholine derivative Y-8894 were investigated in mice, rats, guinea pigs and rabbits by administration of
14C labeled compound (
14C-Y-8894) at a dose of 30 mg/kg.
Urinary and fecal recoveries of radioactivity (
14C) within 4 days following oral administration were 52.2 % and 46.8 % in mice, 24.3 % and 72.5 % in rats, 73.4 % and 22.5 % in guinea pigs, and 64.8 % and 26.0 % in rabbits, respectively. About 93 % of the given
14C was recovered in the rat bile within 24 hours after oral administration.
Maximum blood levels of
14C were obtained within 1 hour after oral administration in all species examined, with all initial biological half-lives (T 1/2) in the range of 1.0 ?? 1.8 hours. Terminal T1/2s were 21.2 ?? 25.8 hours for all species except the guinea pigs. The blood levels in guinea pigs were not detectable 24 hours after oral administration.
The highest levels of
14C were observed in the liver, kidney and lung of mice, and in the liver of rats 0.5 hours after oral administration, and relatively high levels in the lung and kidney of rats, in the adrenal, pancreas, salivary gland and spleen of both mice and rats. Brain levels in both mice and rats were twice of that in the blood. Twenty-four hours after administration significant amount of
14C were detected only in the liver and kidney.
Protein bindings of
14C in the serum were in the range of 63 ?? 83 % for all species.
Major metabolites of Y-8894 in urine of mice were similar to those in urine and bile of rats, but somewhat different from those in urine of guinea pigs and rabbits.
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