Characterization of the in vitro CYP450 mediated metabolism of the polymorphic CYP2D6 probe drug codeine in horses

Heather K Knych, Russell W. Baden, Sophie R. Gretler, Daniel S. McKemie

Research output: Contribution to journalArticle

Abstract

Despite their widespread popularity as sport and companion animals and published and anecdotal reports of vast difference in drug disposition and pharmacokinetics between individuals, studies describing equine drug metabolism are limited. It has been theorized that similar to humans, members of the CYP2D family in horses may be polymorphic in nature leading to differences in metabolism of substrates. This study aims to build on the limited current knowledge regarding P450 mediated metabolism in horses by describing the metabolism of the polymorphic CYP2D6 probe drug codeine in vitro. Codeine, at varying substrate concentrations, was incubated with equine liver microsomes (±UDPGA) and a panel of baculovirus expressed recombinant equine P450s. Parent drug and metabolite concentrations were determined using LC-MS/MS. Incubation of codeine in equine liver microsomes generated norcodeine, morphine, codeine glucuronide and morphine 3- and 6- glucuronide. In recombinant P450 assays, the newly described CYP2D82 was responsible for catalyzing the biotransformation of codeine to morphine (Km of 247.4 μM and a Vmax of 1.6 pmol/min/pmol P450). CYP2D82 is 80% homologous to the highly polymorphic CYP2D6 enzyme, which is responsible for biotransformation of codeine to morphine in humans. CYP3A95, which shares 79% sequence homology with human CYP3A4 and CYP2D50 catalyzed the conversion of codeine to norcodeine (Km of 104.1 and 526.9 μM, Vmax of 2.8 and 2.6 pmol/min/pmol P450). In addition to describing the P450 mediated metabolism of codeine, the current study offers a candidate probe drug that could be used in vivo to study the functional implications of polymorphisms in the CYP2D gene in horses.

Original languageEnglish (US)
Pages (from-to)184-192
Number of pages9
JournalBiochemical Pharmacology
Volume168
DOIs
StatePublished - Oct 1 2019

Fingerprint

Codeine
Cytochrome P-450 CYP2D6
Metabolism
Horses
Pharmaceutical Preparations
Morphine
Liver Microsomes
Biotransformation
Liver
Uridine Diphosphate Glucuronic Acid
Cytochrome P-450 CYP3A
Pharmacokinetics
In Vitro Techniques
Baculoviridae
Pets
Glucuronides
Substrates
Sequence Homology
Metabolites
Sports

Keywords

  • Codeine
  • Cytochrome P450
  • Equine
  • Metabolism
  • Polymorphism

ASJC Scopus subject areas

  • Biochemistry
  • Pharmacology

Cite this

Characterization of the in vitro CYP450 mediated metabolism of the polymorphic CYP2D6 probe drug codeine in horses. / Knych, Heather K; Baden, Russell W.; Gretler, Sophie R.; McKemie, Daniel S.

In: Biochemical Pharmacology, Vol. 168, 01.10.2019, p. 184-192.

Research output: Contribution to journalArticle

@article{2544eac05c314b669d3721cfabfcb1b4,
title = "Characterization of the in vitro CYP450 mediated metabolism of the polymorphic CYP2D6 probe drug codeine in horses",
abstract = "Despite their widespread popularity as sport and companion animals and published and anecdotal reports of vast difference in drug disposition and pharmacokinetics between individuals, studies describing equine drug metabolism are limited. It has been theorized that similar to humans, members of the CYP2D family in horses may be polymorphic in nature leading to differences in metabolism of substrates. This study aims to build on the limited current knowledge regarding P450 mediated metabolism in horses by describing the metabolism of the polymorphic CYP2D6 probe drug codeine in vitro. Codeine, at varying substrate concentrations, was incubated with equine liver microsomes (±UDPGA) and a panel of baculovirus expressed recombinant equine P450s. Parent drug and metabolite concentrations were determined using LC-MS/MS. Incubation of codeine in equine liver microsomes generated norcodeine, morphine, codeine glucuronide and morphine 3- and 6- glucuronide. In recombinant P450 assays, the newly described CYP2D82 was responsible for catalyzing the biotransformation of codeine to morphine (Km of 247.4 μM and a Vmax of 1.6 pmol/min/pmol P450). CYP2D82 is 80{\%} homologous to the highly polymorphic CYP2D6 enzyme, which is responsible for biotransformation of codeine to morphine in humans. CYP3A95, which shares 79{\%} sequence homology with human CYP3A4 and CYP2D50 catalyzed the conversion of codeine to norcodeine (Km of 104.1 and 526.9 μM, Vmax of 2.8 and 2.6 pmol/min/pmol P450). In addition to describing the P450 mediated metabolism of codeine, the current study offers a candidate probe drug that could be used in vivo to study the functional implications of polymorphisms in the CYP2D gene in horses.",
keywords = "Codeine, Cytochrome P450, Equine, Metabolism, Polymorphism",
author = "Knych, {Heather K} and Baden, {Russell W.} and Gretler, {Sophie R.} and McKemie, {Daniel S.}",
year = "2019",
month = "10",
day = "1",
doi = "10.1016/j.bcp.2019.07.005",
language = "English (US)",
volume = "168",
pages = "184--192",
journal = "Biochemical Pharmacology",
issn = "0006-2952",
publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Characterization of the in vitro CYP450 mediated metabolism of the polymorphic CYP2D6 probe drug codeine in horses

AU - Knych, Heather K

AU - Baden, Russell W.

AU - Gretler, Sophie R.

AU - McKemie, Daniel S.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Despite their widespread popularity as sport and companion animals and published and anecdotal reports of vast difference in drug disposition and pharmacokinetics between individuals, studies describing equine drug metabolism are limited. It has been theorized that similar to humans, members of the CYP2D family in horses may be polymorphic in nature leading to differences in metabolism of substrates. This study aims to build on the limited current knowledge regarding P450 mediated metabolism in horses by describing the metabolism of the polymorphic CYP2D6 probe drug codeine in vitro. Codeine, at varying substrate concentrations, was incubated with equine liver microsomes (±UDPGA) and a panel of baculovirus expressed recombinant equine P450s. Parent drug and metabolite concentrations were determined using LC-MS/MS. Incubation of codeine in equine liver microsomes generated norcodeine, morphine, codeine glucuronide and morphine 3- and 6- glucuronide. In recombinant P450 assays, the newly described CYP2D82 was responsible for catalyzing the biotransformation of codeine to morphine (Km of 247.4 μM and a Vmax of 1.6 pmol/min/pmol P450). CYP2D82 is 80% homologous to the highly polymorphic CYP2D6 enzyme, which is responsible for biotransformation of codeine to morphine in humans. CYP3A95, which shares 79% sequence homology with human CYP3A4 and CYP2D50 catalyzed the conversion of codeine to norcodeine (Km of 104.1 and 526.9 μM, Vmax of 2.8 and 2.6 pmol/min/pmol P450). In addition to describing the P450 mediated metabolism of codeine, the current study offers a candidate probe drug that could be used in vivo to study the functional implications of polymorphisms in the CYP2D gene in horses.

AB - Despite their widespread popularity as sport and companion animals and published and anecdotal reports of vast difference in drug disposition and pharmacokinetics between individuals, studies describing equine drug metabolism are limited. It has been theorized that similar to humans, members of the CYP2D family in horses may be polymorphic in nature leading to differences in metabolism of substrates. This study aims to build on the limited current knowledge regarding P450 mediated metabolism in horses by describing the metabolism of the polymorphic CYP2D6 probe drug codeine in vitro. Codeine, at varying substrate concentrations, was incubated with equine liver microsomes (±UDPGA) and a panel of baculovirus expressed recombinant equine P450s. Parent drug and metabolite concentrations were determined using LC-MS/MS. Incubation of codeine in equine liver microsomes generated norcodeine, morphine, codeine glucuronide and morphine 3- and 6- glucuronide. In recombinant P450 assays, the newly described CYP2D82 was responsible for catalyzing the biotransformation of codeine to morphine (Km of 247.4 μM and a Vmax of 1.6 pmol/min/pmol P450). CYP2D82 is 80% homologous to the highly polymorphic CYP2D6 enzyme, which is responsible for biotransformation of codeine to morphine in humans. CYP3A95, which shares 79% sequence homology with human CYP3A4 and CYP2D50 catalyzed the conversion of codeine to norcodeine (Km of 104.1 and 526.9 μM, Vmax of 2.8 and 2.6 pmol/min/pmol P450). In addition to describing the P450 mediated metabolism of codeine, the current study offers a candidate probe drug that could be used in vivo to study the functional implications of polymorphisms in the CYP2D gene in horses.

KW - Codeine

KW - Cytochrome P450

KW - Equine

KW - Metabolism

KW - Polymorphism

UR - http://www.scopus.com/inward/record.url?scp=85068864132&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068864132&partnerID=8YFLogxK

U2 - 10.1016/j.bcp.2019.07.005

DO - 10.1016/j.bcp.2019.07.005

M3 - Article

VL - 168

SP - 184

EP - 192

JO - Biochemical Pharmacology

JF - Biochemical Pharmacology

SN - 0006-2952

ER -