Nov 1, 1975

Correlation of 14C-griseofulvin metabolism in rat liver microsomes, isolated perfused rat livers, and in rats with bile duct cannulas

Drug Metabolism and Disposition : the Biological Fate of Chemicals
R L ChangC Lin


The metabolism of 14C-griseofulvin has been compared in rat liver microsomes, isolated perfused rat livers, and rats with bile duct cannulas. In all three preparations, 4-desmethylgriseofulvin and 6-desmethylgriseofulvin were the major metabolites. The ratio of total 4-desmethylgriseofulvin to 6-desmethylgriseofulvin formed was 1.20, 0.89, and 1.01 in liver microsomes, isolated perfused livers, and rats with bile duct cannulas, respectively. After a 7-min incubation with liver microsomes, most (96%) of the griseofulvin remained unchanged. Only small amounts of 4-desmethylgriseofulvin (1.26%) of dose) and 6-desmethylgriseofulvin (1.05% of dose) were formed. In isolated perfused liver, most of the drug (59% of dose) was excreted into bile within 4 hr, primarily as 4-desmethylgriseofulvin (24% of dose) and 6-methylgriseofulvin (24% of dose). In animals with bile duct cannulas, 65% of the dose was excreted into bile and 18% of the dose into urine within 4 hours. In bile, 32% of the dose was excreted as 4-desmethylgriseofulvin and 20% of the dose as 6-desmethylgriseofulvin, whereas in urine the drug was excreated predominantly as 6-desmethylgriseofulvin (13% of dose) with only a small amount of 4-desmethylgriseofulvin (1% of dose), ...Continue Reading

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Mentioned in this Paper

Metabolic Process, Cellular
Microsomes, Liver
Body Excretions
Metabolic Pathway

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