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Related Concept Videos

Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes01:28

Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes

Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450 isoenzymes,...

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Equine cytochrome P450 2C92: cDNA cloning, expression and initial characterization.

H K DiMaio Knych1, C DeStefano Shields, A R Buckpitt

  • 1K.L. Maddy Equine Analytical Chemistry Laboratory, California Animal Health and Food Safety Laboratory, School of Veterinary Medicine, University of California, West Health Science Drive, Davis, CA 95616, USA. hkknych@ucdavis.edu

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Researchers identified equine CYP2C92, an enzyme crucial for drug metabolism in horses. This cytochrome P450 monooxygenase showed slower diclofenac metabolism than its human counterpart, highlighting significant species differences in drug clearance.

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Area of Science:

  • Pharmacology
  • Biochemistry
  • Veterinary Medicine

Background:

  • Limited understanding of how horses metabolize drugs.
  • Cytochrome P450 enzymes are key to drug metabolism.
  • Need for equine-specific drug metabolism data.

Purpose of the Study:

  • To clone, express, and characterize an equine cytochrome P450 2C enzyme.
  • To investigate its catalytic activity with common drug substrates.
  • To compare equine and human drug metabolism pathways.

Main Methods:

  • Cloning and expression of equine CYP2C92 in a baculovirus system.
  • Measurement of recombinant CYP2C92 catalytic activity.
  • Incubation with substrates like diclofenac, tolbutamide, and (S)-warfarin.

Main Results:

  • Equine CYP2C92 was successfully expressed and characterized.
  • Diclofenac metabolism by CYP2C92 was 20-fold slower than human CYP2C9.
  • CYP2C92 showed comparable tolbutamide and (S)-warfarin hydroxylase activity to human CYP2C9 with cytochrome b(5).

Conclusions:

  • Significant interspecies differences exist in CYP2C orthologue substrate metabolism between horses and humans.
  • Equine drug metabolism pathways differ from those in humans.
  • Further characterization of equine P450 enzyme systems is essential for veterinary pharmacology.