Abstract：
:Incubation of taxol with human hepatic microsomal fractions or freshly isolated human liver slices yields three metabolite high performance liquid chromatography peaks, metabolite A, metabolite B, and 6 alpha-hydroxytaxol. These metabolites are formed in patients given taxol, with 6 alpha-hydroxytaxol formation representing the principal biotransformation pathway. Metabolite B and 6 alpha-hydroxytaxol are shown to be products of different, highly regioselective cytochrome P-450 (P450) enzymes, while metabolite A results from stepwise metabolism by each of these enzymes. Correlation of metabolite B formation with P450 3A markers was good (r2 = 0.91-0.94), but the correlation of 6 alpha-hydroxytaxol formation with markers for several P450 enzymes was poor. Chemical inhibitors that selectively inhibited metabolite B formation (troleandomycin, cyclosporine), that selectively inhibited 6 alpha-hydroxytaxol formation (naringenin, quercetin), or that nonselectively inhibited both pathways (felodipine, ketoconazole) were found. Metabolite B formation was selectively reduced by anti-P450 3A4 antibodies. Expressed human P450 3A4 preparations were efficient catalysts of metabolite B formation; no expressed P450 preparation tested showed a capacity for catalyzing taxane 6 alpha-hydroxylation reactions. The combined results of several experimental approaches show that P450 3A4 is the major catalyst of metabolite B formation and that the identity of the P450 enzyme or enzymes responsible for 6 alpha-hydroxytaxol formation cannot be assigned with certainty.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Harris JW,Rahman A,Kim BR,Guengerich FP,Collins JMsubject
Has Abstractpub_date
1994-08-01 00:00:00pages
4026-35issue
15eissn
0008-5472issn
1538-7445journal_volume
54pub_type
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