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• W2107051821 startingPage "748" @default.
• W2107051821 abstract "Cytochrome P450 inhibition studies are performed in the pharmaceutical industry in the discovery stage to screen candidates that may have the potential for clinical drug-drug interactions. A 96-well microtiter plate assay using recombinant cytochrome P450 (Supersomes) has been used to increase the overall throughput. The IC(50) values for the inhibition of CYP3A4 by 52 new chemical entities (NCEs) were determined using the Supersomes assay with resorufin benzyl ether as a substrate, and the data were compared with those obtained in human liver microsomes (HLM) using midazolam as a substrate. Among the 52 compounds tested, 25 showed IC(50) values within a 5-fold difference in the two assays. For all compounds that showed a >5-fold difference, the IC(50) values in the Supersomes assay were lower than those obtained in HLM, except for one compound. Further studies suggested that this discrepancy was not related to difference in protein concentrations between the two assays. In addition, the IC(50) values for 16 compounds with a wide range of inhibition potency were determined in HLM using testosterone and dextromethorphan as substrates. The results showed an 80 to 93% match within a 5-fold difference between the three probe substrates. However, for certain compounds including ketoconazole, there were substrate-dependent differences in the inhibition. The results suggest that the difference between the Supersomes and HLM could be partially attributed to differences in the substrate used, and to metabolism by other cytochrome P450s present in the HLM but not in the Supersomes. Furthermore, multiple CYP3A4 substrates should be used to improve the reliability of estimating potential drug-drug interaction of NCEs." @default.
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• W2107051821 date "2001-05-01" @default.
• W2107051821 modified "2023-09-25" @default.
• W2107051821 title "Inhibition of CYP3A4 in a rapid microtiter plate assay using recombinant enzyme and in human liver microsomes using conventional substrates." @default.
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• W2107051821 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11302943" @default.
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