Oxidative metabolism of 5-methoxy-N,N-diisopropyltryptamine (Foxy) by human liver microsomes and recombinant cytochrome P450 enzymes

Shizuo Narimatsu, Rei Yonemoto, Keita Saito, Kazuo Takaya, Takuya Kumamoto, Tsutomu Ishikawa, Masato Asanuma, Masahiko Funada, Kimio Kiryu, Shinsaku Naito, Yuzo Yoshida, Shigeo Yamamoto, Nobumitsu Hanioka

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

In vitro quantitative studies of the oxidative metabolism of (5-methoxy-N,N-diisopropyltryptamine, 5-MeO-DIPT, Foxy) were performed using human liver microsomal fractions and recombinant CYP enzymes and synthetic 5-MeO-DIPT metabolites. 5-MeO-DIPT was mainly oxidized to O-demethylated (5-OH-DIPT) and N-deisopropylated (5-MeO-IPT) metabolites in pooled human liver microsomes. In kinetic studies, 5-MeO-DIPT O-demethylation showed monophasic kinetics, whereas its N-deisopropylation showed triphasic kinetics. Among six recombinant CYP enzymes (CYP1A2, CYP2C8, CYP2C9, CYP2C19, CYP2D6 and CYP3A4) expressed in yeast or insect cells, only CYP2D6 exhibited 5-MeO-DIPT O-demethylase activity, while CYP1A2, CYP2C8, CYP2C9, CYP2C19 and CYP3A4 showed 5-MeO-DIPT N-deisopropylase activities. The apparent Km value of CYP2D6 was close to that for 5-MeO-DIPT O-demethylation, and the Km values of other CYP enzymes were similar to those of the low-Km (CYP2C19), intermediate-Km (CYP1A2, CYP2C8 and CYP3A4) and high-Km phases (CYP2C9), respectively, for N-deisopropylation in human liver microsomes. In inhibition studies, quinidine (1 μM), an inhibitor of CYP2D6, almost completely inhibited human liver microsomal 5-MeO-DIPT O-demethylation at a substrate concentration of 10 μM. Furafylline, a CYP1A2 inhibitor, quercetin, a CYP2C8 inhibitor, sulfaphenazole, a CYP2C9 inhibitor and ketoconazole, a CYP3A4 inihibitor (5 μM each) suppressed about 60%, 45%, 15% and 40%, respectively, of 5-MeO-DIPT N-deisopropylation at 50 μM substrate. In contrast, omeprazole (10 μM), a CYP2C19 inhibitor, suppressed only 10% of N-deisopropylation by human liver microsomes, whereas at the same concentration the inhibitor suppressed the reaction by recombinant CYP2C19 almost completely. These results indicate that CYP2D6 is the major 5-MeO-DIPT O-demethylase, and CYP1A2, CYP2C8 and CYP3A4 are the major 5-MeO-DIPT N-deisopropylase enzymes in the human liver.

Original languageEnglish
Pages (from-to)1377-1385
Number of pages9
JournalBiochemical Pharmacology
Volume71
Issue number9
DOIs
Publication statusPublished - Apr 28 2006

Keywords

  • 5-MeO-DIPT
  • 5-MeO-IPT
  • 5-OH-DIPT
  • CYP1A2
  • CYP2C8
  • CYP2D6
  • CYP3A4
  • Foxy

ASJC Scopus subject areas

  • Biochemistry
  • Pharmacology

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