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Drug Metabolism and Disposition Fast Forward
First published on April 12, 2007; DOI: 10.1124/dmd.107.015826

0090-9556/07/3507-1009-1016$20.00
DMD 35:1009-1016, 2007

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CYP1A Induction and Human Risk Assessment: An Evolving Tale of in Vitro and in Vivo Studies

Qiang Ma, and Anthony Y. H. Lu

Receptor Biology Laboratory, Toxicology and Molecular Biology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia (Q.M.); and Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey (A.Y.H.L.)

CYP1A1 and 1A2 play critical roles in the metabolic activation of carcinogenic polycyclic aromatic hydrocarbons (PAHs) and heterocyclic aromatic amines/amides (HAAs), respectively, to electrophilic reactive intermediates, leading to toxicity and cancer. CYP1As are highly inducible by PAHs and halogenated aromatic hydrocarbons via aryl hydrocarbon receptor-mediated gene transcription. The impact of CYP1A induction on the carcinogenic and toxic potentials of environmental, occupational, dietary, and therapeutic chemicals has been a central focus of human risk evaluation and has broadly influenced the fields of cancer research, toxicology, pharmacology, and risk assessment over the past half-century. From the early discovery of CYP1A induction and its role in protection against chemical carcinogenesis in intact animals, to the establishment of CYP1A enzymes as the principal cytochromes P450 for bioactivation of PAHs and HAAs in in vitro assays, to the recent realization of an essential protective role of CYP1A in benzo[a]pyrene-induced lethality and carcinogenesis with CYP1A knockout mice, the understanding of the interrelation between CYP1A induction and chemical safety has followed a full circle. This unique path of CYP1A research underscores the importance of whole animal and human studies in chemical safety evaluation.

Address correspondence to: Qiang Ma, Receptor Biology Laboratory, TMBB/HELD/NIOSH/CDC, Mailstop 3014, 1095 Willowdale Rd., Morgantown, WV 26505. E-mail: qam1{at}cdc.gov




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