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Research ArticleArticle

SERTRALINE IS METABOLIZED BY MULTIPLE CYTOCHROME P450 ENZYMES, MONOAMINE OXIDASES, AND GLUCURONYL TRANSFERASES IN HUMAN: AN IN VITRO STUDY

R. Scott Obach, Loretta M. Cox and Larry M. Tremaine
Drug Metabolism and Disposition February 2005, 33 (2) 262-270; DOI: https://doi.org/10.1124/dmd.104.002428
R. Scott Obach
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Loretta M. Cox
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Larry M. Tremaine
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Abstract

The oxidative and conjugative metabolism of sertraline was examined in vitro to identify the enzymes involved in the generation of N-desmethyl, deaminated, and N-carbamoyl-glucuronidated metabolites in humans. In human liver microsomes, sertraline was N-demethylated and deaminated by cytochrome P450 (P450) enzymes with overall Km values of 98 and 114 μM, respectively, but the intrinsic clearance for N-demethylation was approximately 20-fold greater than for deamination. Using P450 isoform-selective inhibitors and recombinant heterologously expressed enzymes, it was demonstrated that several P450 enzymes catalyzed sertraline N-demethylation, with CYP2B6 contributing the greatest extent, and lesser contributions from CYP2C19, CYP2C9, CYP3A4, and CYP2D6. For deamination, data supported a role for CYP3A4 and CYP2C19. Purified human monoamine oxidases A and B also catalyzed sertraline deamination with comparable Km values (230-270 μM). Monoamine oxidase B catalyzed the reaction approximately 3-fold faster than did monoamine oxidase A. Sertraline N-carbamoyl glucuronidation was measured in human liver microsomes in bicarbonate buffer and under a CO2 atmosphere (Km = 50 μM) and was catalyzed at the fastest rate by recombinant human UGT2B7. The observation that multiple enzymes appear to be involved in sertraline metabolism suggests that there should be no single agent that could substantially alter the pharmacokinetics of sertraline, nor should there be any single drug-metabolizing enzyme genetic polymorphism (e.g., CYP2D6, CYP2C19, CYP2C9, UGT1A1) that could profoundly impact the pharmacokinetics of sertraline.

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  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

  • doi:10.1124/dmd.104.002428.

  • ABBREVIATIONS: P450, cytochrome P450; MAO, monoamine oxidase; PPP, 2-phenyl-2-(1-piperdinyl)propane; RAF, relative activity factor; UDPGA, uridine diphosphoglucuronic acid; UGT, uridine diphosphoglucuronic acid transferase; HPLC, high-performance liquid chromatography; rP450, recombinant cytochrome P450; HLM, human liver microsome(s); CP-105,162, 4-(4-chlorophenyl)-1,2,3,4-tetrahydro-1-naphthalenamine.

    • Received September 20, 2004.
    • Accepted November 12, 2004.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 33 (2)
Drug Metabolism and Disposition
Vol. 33, Issue 2
1 Feb 2005
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Research ArticleArticle

SERTRALINE IS METABOLIZED BY MULTIPLE CYTOCHROME P450 ENZYMES, MONOAMINE OXIDASES, AND GLUCURONYL TRANSFERASES IN HUMAN: AN IN VITRO STUDY

R. Scott Obach, Loretta M. Cox and Larry M. Tremaine
Drug Metabolism and Disposition February 1, 2005, 33 (2) 262-270; DOI: https://doi.org/10.1124/dmd.104.002428

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Research ArticleArticle

SERTRALINE IS METABOLIZED BY MULTIPLE CYTOCHROME P450 ENZYMES, MONOAMINE OXIDASES, AND GLUCURONYL TRANSFERASES IN HUMAN: AN IN VITRO STUDY

R. Scott Obach, Loretta M. Cox and Larry M. Tremaine
Drug Metabolism and Disposition February 1, 2005, 33 (2) 262-270; DOI: https://doi.org/10.1124/dmd.104.002428
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