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Toxicologic Pathology
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Using Cytochrome P-450 Gene Knock-Out Mice to Study Chemical Metabolism, Toxicity, and Carcinogenicity

Burhan I. Ghanayem

Laboratory of Pharmacology and Chemistry, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, Ghanayem{at}niehs.nih.gov

Hongbing Wang

Laboratory of Pharmacology and Chemistry, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina

Susan Sumner

Chemical Industry Institute of Toxicology, Research Triangle Park, North Carolina

Cytochrome P-450 (CYP) enzymes are heme-containing proteins that carry out oxidative metabolism of a wide range of structurally diverse exogenous chemicals and therapeutic agents as well as endogenous compounds. For some of these xenobiotics, oxidative metabolism results in the formation of toxic, mutagenic, or carcinogenic metabolites. In the past, the role of CYP enzymes in metabolism and chemical-induced toxicity was studied indirectly through use of specific antibodies or inducers and inhibitors of these enzymes. Progress in molecular biology and the ability to bioengineer animal models that do not express CYP1A2, CYP1A1, CYP1B1, CYP2E1, or both CYP1A2 and CYP2E1 isozymes has allowed for direct investigations of the in vivo role of these enzymes in the metabolism, toxicity, and carcinogenicity of xenobiotics. This article reviews research conducted to date that utilizes these genetically bioengineered mice in metabolism, toxicity, or carcinogenicity studies of chemicals. Some studies showed a positive correlation between in vivo results and in vitro predictions for the role of a specific CYP in chemical-induced effects, whereas other studies did not support in vitro predictions. Work reviewed herein demonstrates the importance of using animal models for investigating the role of specific CYP enzymes in metabolism and chemical-induced toxicity or carcinogenicity rather than relying solely on in vitro techniques. Eventually, studies of this nature will facilitate a more accurate assessment of human risks with regard to chemicals by helping us to understand the relationships between chemical metabolism, carcinogenicity, and polymorphisms in CYP enzymes.

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Toxicologic Pathology, Vol. 28, No. 6, 839-850 (2000)
DOI: 10.1177/019262330002800613
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