These assays measure the ability of test compounds to inhibit cytochrome P450 activity for four isoforms CYP1A2, CYP2C9, CYP2D6 and CYP3A4, with a time dependent inhibition component for 3A4 only, in human liver microsomes, using luminescent and/or fluorescent assay kits. The test compound’s ability to inhibit the enzyme activity (IC50) was assessed by determining the extent of inhibition of metabolite formation relative to vehicle control (DMSO).
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