Inhibitory effect of glyburide on human cytochrome P450 isoforms in human liver microsomes

Kyoung Ah Kim, Ji Young Park

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    The inhibitory effect of glyburide [International Nonproprietary Name (INN), glibenclamide] on CYP1A2, CYP2C8, CYP2C9, CYP2C19, CYP2D6, CYP2E1, and CYP3A4 activities was evaluated using pooled human liver microsomes. Glyburide strongly inhibited CYP2C9-catalyzed S-warfarin and phenytoin metabolism in a competitive manner, with Ki (IC50) values of 2.4 (11.3) μM and 3.1 (9.4) μM, respectively. CYP3A4-catalyzed midazolam 1-hydroxylation was inhibited by glyburide with a Ki (IC 50) value of 42.5 (90.0) μM. However, glyburide showed no appreciable inhibitory effect on CYP1A2, CYP2C8, CYP2C19, CYP2E1, or CYP2D6. In summary, glyburide showed potent inhibition on CYP2C9 and weak inhibition on CYP3A4, whereas it had minimal or no inhibitory effect on the other cytochromes P450 examined. It is anticipated that clinically significant drug-drug interactions will ensue when glyburide is coadministered with agents that are cleared primarily by the CYP2C9-mediated pathway and those with narrow therapeutic ranges.

    Original languageEnglish
    Pages (from-to)1090-1092
    Number of pages3
    JournalDrug Metabolism and Disposition
    Volume31
    Issue number9
    DOIs
    Publication statusPublished - 2003 Sep 1

    ASJC Scopus subject areas

    • Pharmacology
    • Pharmaceutical Science

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