| Assay Method Information | |
| | Human Cytochrome P450 Inhibition Assay |
| Description: | CYP450 enzymes (final protein 75 pmol/mL for CYP1A2; 12.5 pmol/mL for CYP2C19; and 25 pmol/mL for CYP2C9, 2D6 and 3A4), 0.1 M phosphate buffer pH 7.4, probe and test compound (final concentration 50, 15.8, 5, 1.58, 0.5 and 0.158 μM; diluted from 10 mM stock solution to give a final DMSO concentration of 1%) were pre-incubated at 37° C. for 5 minutes. The reaction was initiated by the addition of 20 μL of 10 mM NADPH in phosphate buffer. The final incubation volume was 200 μL. The following control inhibitors were used for each CYP450 inhibition assay: CYP1A2: α-naphthoflavone; CYP2C9: sulfaphenazole; CYP2C19: tranylcypromine; CYP2D6: quinidine; CYP3A4: ketoconazole.Each compound was incubated for 10 minutes at 37° C. The reactions were stopped by the addition of methanol (final composition 1:1, aqueous: methanol). The incubation plates were shaken, chilled at 20° C. for 2 hours, and centrifuged at 3500 rpm for 15 minutes at 4° C. to precipitate the protein. |
| Affinity data for this assay | |
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