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Rapid CommunicationShort Communication

Desacetyl-Diltiazem Displays Severalfold Higher Affinity to CYP2D6 Compared with CYP3A4

Espen Molden, Anders Åsberg and Hege Christensen
Drug Metabolism and Disposition January 2002, 30 (1) 1-3; DOI: https://doi.org/10.1124/dmd.30.1.1
Espen Molden
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Anders Åsberg
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Hege Christensen
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Abstract

It has earlier been shown that the isoenzymes CYP2D6 and CYP3A4 are involved in O- and N-demethylation of diltiazem (DTZ), respectively. Apparently, CYP3A4 plays a more prominent role than CYP2D6 in the overall metabolism of DTZ. However, previous observations indicate that the opposite might be true for the pharmacologically active metabolite desacetyl-DTZ (M1). Thus, the aim of the present in vitro investigation was to study the relative affinity of M1 to CYP2D6 and CYP3A4. Immortalized human liver epithelial cells transfected with either CYP2D6 or CYP3A4 were used as a model system, and the presence of M1 and its metabolites in the cell culture medium was analyzed by high-performance liquid chromatography/UV detection both before and following 90 min of incubation. The estimated Km value for the CYP2D6-mediated O-demethylation of M1 was approximately 5 μM. In comparison, the affinity of M1 to CYP3A4 (N-demethylation) was about 100 times lower (Km, ≈540 μM) than to CYP2D6. These in vitro data suggest that M1 metabolism via CYP2D6, in contrast to the parent drug, probably is the preferred pathway in vivo. Metabolism mediated through CYP2D6 is associated with a substantial interindividual variability, and since M1 expresses pharmacological activity, individual CYP2D6 metabolic capacity might be an aspect to consider when using DTZ.

Footnotes

  • Abbreviations used are::
    DTZ
    diltiazem
    M1
    desacetyl-diltiazem
    P450
    cytochrome P450
    THLE cells
    transfected human liver epithelial cells
    M2
    desacetyl-N-demethyl-diltiazem
    M4
    desacetyl-O-demethyl-diltiazem
    • Received June 13, 2001.
    • Accepted September 20, 2001.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 30 (1)
Drug Metabolism and Disposition
Vol. 30, Issue 1
1 Jan 2002
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Rapid CommunicationShort Communication

Desacetyl-Diltiazem Displays Severalfold Higher Affinity to CYP2D6 Compared with CYP3A4

Espen Molden, Anders Åsberg and Hege Christensen
Drug Metabolism and Disposition January 1, 2002, 30 (1) 1-3; DOI: https://doi.org/10.1124/dmd.30.1.1

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Rapid CommunicationShort Communication

Desacetyl-Diltiazem Displays Severalfold Higher Affinity to CYP2D6 Compared with CYP3A4

Espen Molden, Anders Åsberg and Hege Christensen
Drug Metabolism and Disposition January 1, 2002, 30 (1) 1-3; DOI: https://doi.org/10.1124/dmd.30.1.1
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