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• W2015129737 abstract "Aims The aims of the present study were to investigate the metabolism of astemizole in human liver microsomes, to assess possible pharmacokinetic drug‐interactions with astemizole and to compare its metabolism with terfenadine, a typical H 1 receptor antagonist known to be metabolized predominantly by CYP3A4. Methods Astemizole or terfenadine were incubated with human liver microsomes or recombinant cytochromes P450 in the absence or presence of chemical inhibitors and antibodies. Results Troleandomycin, a CYP3A4 inhibitor, markedly reduced the oxidation of terfenadine (26% of controls) in human liver microsomes, but showed only a marginal inhibition on the oxidation of astemizole (81% of controls). Three metabolites of astemizole were detected in a liver microsomal system, i.e. desmethylastemizole (DES‐AST), 6‐hydroxyastemizole (6OH‐AST) and norastemizole (NOR‐AST) at the ratio of 7.4 : 2.8 : 1. Experiments with recombinant P450s and antibodies indicate a negligible role for CYP3A4 on the main metabolic route of astemizole, i.e. formation of DES‐AST, although CYP3A4 may mediate the relatively minor metabolic routes to 6OH‐AST and NOR‐AST. Recombinant CYP2D6 catalysed the formation of 6OH‐AST and DES‐AST. Studies with human liver microsomes, however, suggest a major role for a mono P450 in DES‐AST formation. Conclusions In contrast to terfenadine, a minor role for CYP3A4 and involvement of multiple P450 isozymes are suggested in the metabolism of astemizole. These differences in P450 isozymes involved in the metabolism of astemizole and terfenadine may associate with distinct pharmacokinetic influences observed with coadministration of drugs metabolized by CYP3A4." @default.
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• W2015129737 date "2001-02-01" @default.
• W2015129737 modified "2023-10-18" @default.
• W2015129737 title "Involvement of multiple human cytochromes P450 in the liver microsomal metabolism of astemizole and a comparison with terfenadine" @default.
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• W2015129737 doi "https://doi.org/10.1111/j.1365-2125.2001.01292.x" @default.
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