Potential impact of cytochrome P450 3A5 in human liver on drug interactions with triazoles.
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Yamazaki H, Nakamoto M, Shimizu M, Murayama N, Niwa T
Potential impact of cytochrome P450 3A5 in human liver on drug interactions with triazoles.
Br J Clin Pharmacol. 2010 Jun;69(6):593-7. doi: 10.1111/j.1365-2125.2010.03656.x.
- PubMed ID
- 20565450 [ View in PubMed]
- Abstract
Cytochrome P450 3A is the main enzyme subfamily involved in the metabolism of a variety of marketed medicines. It is generally believed that the substrate specificity of polymorphic P450 3A5 is similar to that of the predominant P450 3A4 isoform, although some differences in catalytic properties have been found. It has been hypothesized that individuals with CYP3A5 1 (P450 3A5 expresser) might clear the HIV protease inhibitor saquinavir, administered by mouth, more rapidly than subjects lacking functional CYP3A5 alleles. Enhanced midazolam hydroxylation and cyclosporin metabolism occur in an in vitro P450 3A5 system and in liver microsomes expressing P450 3A5 in the presence of thalidomide. However, inhibition constants (K(i)) of three triazole anti-fungal drugs (itraconazole, fluconazole, and voriconazole) for liver microsomal P450 3A5 are higher than for liver microsomal P450 3A4. To predict drug interactions in vivo, we estimated increases of areas under the curves (AUC) dependent on polymorphic P450 3A5 expression, using both 1 +[Inhibitor] / K(i) (recommended in US FDA guidance), and 1 +[Inhibitor](unbound) / K(i) (as recommended by Japanese MHLW Notice). Voriconazole would be expected to cause approximately a three-fold higher increase in AUC in subjects with CYP3A5 3/3 than in those with CYP3A5 1/3, especially when estimated using the FDA guidance. We conclude that drug interactions between marketed drugs may differ substantially between individuals with genetically distinct P450 3A5 catalytic functions.
DrugBank Data that Cites this Article
- Drug Enzymes
Drug Enzyme Kind Organism Pharmacological Action Actions Voriconazole Cytochrome P450 3A5 Protein Humans UnknownSubstrateInhibitorDetails - Drug Interactions
Drugs Interaction Integrate drug-drug
interactions in your softwareAlfentanilMibefradil The metabolism of Alfentanil can be decreased when combined with Mibefradil. AlfentanilTroglitazone The metabolism of Alfentanil can be decreased when combined with Troglitazone. AlfentanilChloramphenicol The metabolism of Alfentanil can be decreased when combined with Chloramphenicol. AlfentanilImatinib The metabolism of Alfentanil can be decreased when combined with Imatinib. AlfentanilGestodene The metabolism of Alfentanil can be decreased when combined with Gestodene.