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Biochem Pharmacol. 2009 Feb 1;77(3):444-50. doi: 10.1016/j.bcp.2008.10.024. Epub 2008 Oct 31.

Investigations on the cytochrome P450 (CYP) isoenzymes involved in the metabolism of the designer drugs N-(1-phenyl cyclohexyl)-2-ethoxyethanamine and N-(1-phenylcyclohexyl)-2-methoxyethanamine.

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  • 1Department of Experimental and Clinical Toxicology, Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, Kirrberger Strasse 1, D-66421 Homburg (Saar), Germany.


Investigations using insect cell microsomes with cDNA-expressed human cytochrome P450 (CYP)s and human liver microsomes (HLM) are reported on the CYP isoenzymes involved in the metabolism of the designer drugs N-(1-phenylcyclohexyl)-2-ethoxyethanamine (PCEEA) to O-deethyl PCEEA and N-(1-phenylcyclohexyl)-2-methoxyethanamine (PCMEA) to O-demethyl PCMEA. Gas chromatography-mass spectrometry or liquid chromatography-mass spectrometry was used for the analysis of the incubation samples. PCEEA O-deethylation was catalyzed by CYP2B6, CYP2C9, CYP2C19, and CYP3A4, while PCMEA O-demethylation was catalyzed only by CYP2B6 and CYP2C19. Considering the relative activity factor approach, these enzymes accounted for 53%, 25%, 4%, and 18% of net clearance for PCEEA and 91% and 9% of net clearance for PCMEA, respectively. The chemical CYP2B6 inhibitor 4-(4-chlorobenzyl)pyridine (CBP) reduced the metabolite formation in pooled HLM by 63% at 1 microM PCEEA. At 10 microM PCEEA, CBP reduced metabolite formation by 61%, while inhibition of CYP3A4 by ketoconazole and inhibition of CYP2C9 by sulfaphenazole showed no inhibitory effect. At 1 microM PCMEA, CBP reduced metabolite formation in pooled HLM by 70% and at 10 microM PCMEA by 78%, respectively. In conclusion, the main metabolic step of both studied drugs was catalyzed by different CYPs.

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