Cytochrome P450 1A-Dependent Activities in Deer, Cattle and Horses

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  • DARWISH Wageh Sobhy
    Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University Food Control Department, Faculty of Veterinary Medicine, Zagazig University
  • IKENAKA Yoshinori
    Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University
  • ELDALY Elsaid Abozeid
    Food Control Department, Faculty of Veterinary Medicine, Zagazig University
  • OHNO Marumi
    Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University
  • SAKAMOTO Kentaro Q.
    Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University
  • FUJITA Shoichi
    Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University
  • ISHIZUKA Mayumi
    Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University

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  • Toxicology: Cytochrome P450 1A-dependent activities in deer, cattle and horses

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The objective of this study was to investigate and characterize the metabolic activities of CYP1A in deer, cattle and horses in comparison to those of rats using ethoxyresorufin O-deethylation (EROD) and methoxyresorufin O-demethylation (MROD) assays. We performed an inhibition study for these activities using anti-rat CYP1A1 antibody and identified that these activities were due to the CYP1A subfamily. Interspecies differences in the CYP1A-dependent activities were highly observed in this study. In particular, we found that the horse had the highest EROD and MROD activities among the examined animal species. In the kinetic analysis, the horses showed the highest Vmax and catalytic efficiency (Vmax/Km), followed by the cattle, deer and rats.<br>

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