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Vol. 29, Issue 11, 1410-1423, November 2001
Laboratory of Molecular Carcinogenesis and Laboratory of
Metabolism, National Cancer Institute, National Institutes of Health,
Bethesda, Maryland
Hybridomas were isolated that produce 13 monoclonal antibodies
(mAbs) that are specific and highly inhibitory to members of the human
P450 2C subfamily, 2C8, 2C9, 2C9*2, and 2C19. Many of the mAbs to P450
2C8, 2C9, and 2C19 are specific and exhibit potent inhibitory activity
(85-95%). mAb 281-1-1 specifically binds, immunoblots, and strongly
inhibits the activity of P450 2C8. mAb 763-15-5 specifically binds and
strongly inhibits the activity of P450 2C9. mAb 1-7-4-8 specifically
binds and strongly inhibits the activity of P450 2C19. The other mAbs
bind and inhibit sets and subsets of the P450 2C family. The single and
the combinatorial use of the mAbs can "reaction phenotype", i.e.,
determine the metabolic contribution and interindividual variation of a
P450 isoform for the metabolism of a drug or nondrug xenobiotic in human liver microsomes. The utility of the mAb-based analytic system
was examined with the model substrates Taxol (paclitaxel), diazepam,
tolbutamide, diclofenac, mephenytoin, and imipramine. The mAb system
can identify drugs metabolized by a common P450 or several P450s and
polymorphic P450s. The mAb system identifies drugs or drug metabolic
pathways that are catalyzed by a single P450 and thus may be used for
in vivo phenotyping. The mAb system can identify whether a particular
drug is metabolized by a single P450 that may exhibit polymorphic
expression in humans. The mAb system offers large potential for studies
of cytochrome P450 function useful in drug discovery and reduces the
possibility of adverse drug reactions due to polymorphisms and drug interactions.
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