Assay Method Information

Assay Name:  Inhibition Assay
Description:  Mixtures of isozyme inhibitors (sulfaphenazole, tranylcypromine, and ketoconazole as specific inhibitors of isozymes 2C9, 2C19, and 3A4, respectively) were prepared containing each inhibitor at concentrations of 6000, 2000, 600, 200, 60, 20, 6, and 2 uM by serial dilution with DMSO:ACN (50:50 v/v). The mixed inhibitor solutions were then diluted 20-fold with DMSO:MeCN:deionized water (5:5:180 v/v/v) to concentrations of 300, 100, 30, 10, 3, 1, 0.3, and 0.1 uM. The percent of organic solvent attributable to the test compound or inhibitor mixture in the final reaction mixture was 2% v/v. Pooled human liver microsome suspension (20 mg/mL) was diluted with phosphate buffer to obtain a 5 mg/mL suspension. A solution of NADPH was prepared in phosphate buffer at a concentration of 5 mM. Separate stock solutions of each substrate were prepared in DMSO:MeCN (50:50 v/v), mixed, and diluted in phosphate buffer to obtain a single solution.
Affinity data for this assay

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