Assay Method Information

Assay Name:  Luciferase-Based P450-Glo Assay
Description:  Five CYP isoforms (0.5 pmol) were tested, namely 1A2, 2C9, 2C19, 2D6 and 3A4 (each isoform was assayed in a separate assay plate). Each assay plate contained several compounds at 2 concentrations (10 uM and 1 uM), with 2 replicates at each concentration or a small number of compounds per plate in dose response by duplicate (50, 16.5, 5.4, 1.8, 0.6, 0.2, 0.066, 0.022, 0.007 uM). In addition, each assay plate contained 8 different concentrations of an isoform-specific inhibitor (Furafylline, Sulfaphenazole, N-3-benzylnirvanol, Quinidine and Ketoconazole as inhibitors of CYP 1A2, 2C9, 2C19, 2D6 and 3A4, respectively), with two replicates at each concentration. The test compounds and the reference inhibitors were tested at a final DMSO concentration of 0.5%. The assay plate included also 8 replicates a vehicle control containing 0.5% DMSO/H2O. The membranes containing the CYPs, test compound and the probe substrate were pre-incubated 10 min at 37°C. in the absence of NADPH, NADPH was then added following incubation for 60 minutes at 37°C., the reaction was terminated by the addition of Luciferin detection reagent. After 20 min incubation at 37°C., the assay plate was read in the Envision 2104 Multilable reader. Values were normalized against the control activity included for each CYP. These values were plotted against the inhibitor concentration and were fitted to a sigmoid dose-response curve by using the model sigmoidal Four-Parameter Logistc inplement for Activity baseĀ  software.
Affinity data for this assay

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