Related Experiment Video
Updated: Oct 19, 2026

Mass Spectrometry and Luminogenic-based Approaches to Characterize Phase I Metabolic Competency of In Vitro Cell Cultures
Published on: March 28, 2017
Interspecies differences in metabolism of heterocyclic aromatic amines by rat and human P450 1A2
R J Turesky1, A Constable, L B Fay
1Nestle Research Center, Nestec Ltd., Vers-chez-les-Blanc, Lausanne, Switzerland. robert.turesky@rdls.nestle.com
Abstract:
The catalytic efficiences of cytochrome P450 (P450)-mediated N-oxidation of the 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx) and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) by recombinant human P450 1A2 were 10-19-fold higher than rat P450 1A2, while methoxyresorufin O-demethylation activity was comparable for both P450s. Similar findings were observed with rat and human liver microsomal samples. Interspecies differences in P450 enzyme expression and catalytic activities may be significant and must be considered when assessing human health risk.
More Related Videos
08:28Microsurgical Skills of Establishing Permanent Jugular Vein Cannulation in Rats for Serial Blood Sampling of Orally Administered Drug
Published on: December 14, 2021
07:38A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s
Published on: September 25, 2017
Related Concept Videos
Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes
Factors Affecting Drug Biotransformation: Biological
Species differences: Variations in enzyme systems across species can cause disparities in drug metabolism. For instance, humans may metabolize certain drugs faster than rodents, altering therapeutic effects.
Strain differences: Genetic variations within a species can result in differing enzyme activity, impacting drug response and toxicity. For example, some mouse strains may...
Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase
Drug toxicity: Idiosyncratic Reactions
Pharmacogenetics of Drug Metabolism: Overview
Pharmacokinetics in Pediatric Patients: Drug Metabolism