title: Effect of 5-fluorocytosine and 5-fluorouracil on human and rat hepatic cytochrome P 450.
abstract: Hepatotoxicity is a well-known side effect of the antifungal drug 5-fluorocytosine. The underlying mechanisms of this toxicity are unknown. The present in vitro study was, therefore, designed to assess the influence of 5-fluorocytosine and 5-fluorouracil on the hepatic cytochrome P 450 concentration in human and rat liver microsomes. Incubation of human or rat hepatic microsomes for 1 h with 5-fluorocytosine up to 500 micrograms/ml or with 5-fluorouracil up to 200 micrograms/ml did not influence the cytochrome P 450 concentration. In comparison the amount of cytochrome P 450 in human liver, however, was lower than in rat liver microsomes and a more interindividual variation was observed.
authors.forename: G
authors.initials: G
authors.lastname: Inselmann
authors.forename: U
authors.initials: U
authors.lastname: Holzlöhner
authors.forename: H T
authors.initials: HT
authors.lastname: Heidemann
mesh_terms: D000818:Animals; D046508:Culture Techniques; D003577:Cytochrome P-450 Enzyme System / Q000032:analysis*; D005437:Flucytosine / Q000494:pharmacology*; D005472:Fluorouracil / Q000494:pharmacology*; D006801:Humans; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects* / Q000201:enzymology; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D003577:Cytochrome P-450 Enzyme System; D005437:Flucytosine; D005472:Fluorouracil