Abstract
Cytochrome P450 (P450) enzyme expression patterns were determined for a panel of 60 human tumor cell lines, representing nine tumor tissue types, used by the National Cancer Institute (NCI) Anticancer Drug Screening Program. All 60 tumor cell lines displayed significant P450 activity, as well as P450 reductase activity, as determined using the general P450 substrate 7-benzyloxyresorufin. Cell line-specific P450 enzyme patterns were observed using three other P450 substrates, 7-ethoxycoumarin, coumarin, and 7-ethoxyresorufin, each of which was metabolized at a low rate. Using a pattern-matching computer program, COMPARE, correlative relationships were investigated between the arrays of P450 activities and the patterns of cytotoxicity exhibited by a large group of anticancer agents of proven or potential clinical utility. Significant negative correlations between the patterns of P450-dependent 7-benzyloxyresorufin metabolism activity and cell line chemosensitivity were observed for 10 standard anticancer agents (including 6 alkylating agents) and 55 investigational compounds, suggesting a role for P450 metabolism in the inactivation of these agents. Negative correlations between 7-ethoxycoumarinO-deethylation and cell line chemosensitivity to a group of topoisomerase inhibitors were also seen, again suggesting P450-dependent drug inactivation. P450 enzyme profiling may thus aid in interpreting the patterns of drug sensitivity and resistance in the NCI tumor cell panel, and may facilitate the identification of anticancer agents whose activity can be altered via cytochrome P450 metabolism.
Footnotes
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Send reprint requests to: Dr. David J. Waxman, Dept. of Biology, Boston University, 5 Cummington St., Boston, MA. E-mail:djw{at}bio.bu.edu
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↵1 Current address: Central Research Division, Pfizer Inc., Groton, CT.
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These studies were supported in part by Contract SAIC 97-CX-50351A and by National Institutes of Health Grant CA49248 (to D.J.W.). Support was provided in whole or in part with Federal funds from the National Cancer Institute, National Institutes of Health, under Contract N01-CO-56000.
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Disclaimer: The content of this article does not necessarily reflect the views or policies of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organization imply endorsement by the U.S. government.
- Abbreviations used are::
- P450 or CYP
- cytochrome P450
- NCI
- U.S. National Cancer Institute
- P450 reductase
- NADPH-cytochrome P450 oxidoreductase
- 7-ECOD
- 7-ethoxycoumarinO-deethylase
- 7-EROD
- 7-ethoxyresorufinO-deethylase
- 7-BROD
- 7-benzyloxyresorufinO-debenzylase
- PCC
- Pearson correlation coefficient
- Received July 6, 2000.
- Accepted October 26, 2000.
- The American Society for Pharmacology and Experimental Therapeutics
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