| Assay Method Information | |
| | Enzymatic Activity Assay |
| Description: | I. Test Materials and Instruments1. Human liver microsomes (Corning 452117)2. NADPH (Solarbio 705Y021)3. Positive substrates diclofenac (Sigma SLBV3438), dextromethorphan (TRC 3-EDO-175-1) and midazolam (Cerilliant FE01161704)4. Positive inhibitors sulfaphenazole (D. Ehrenstorfer GmbH 109012), quinidine (TCI WEODL-RE) and ketoconazole (Sigma 100M1091V)5. AB Sciex Triple Quad 5500 liquid chromatography-mass spectrometryII. Test Steps: 1. Preparation of 100 mM phosphate buffered saline (PBS): 7.098 g of Na2HPO4 was weighed, 500 mL of pure water was added and subjected to ultrasonic dissolution to obtain solution A. 3.400 g of KH2PO4 was weighed, 250 mL of pure water was added and subjected to ultrasonic dissolution to obtain solution B. Solution A was placed on a stirrer and solution B was slowly added until pH reaches 7.4 to prepare 100 mM PBS buffer. 2. Preparation of 10 mM NADPH solution with 100 mM PBS buffer. 10 mM stock solution of compounds of the invention was diluted with DMSO to obtain a 200× concentration of compound working solution (6000, 2000, 600, 200, 60, 20, 0 µM). The stock solution of positive inhibitors was diluted with DMSO to obtain a 200× concentration of positive inhibitor working solution (sulfaphenazole, 1000, 300, 100, 30, 10, 3, 0 µM; quinidine/ketoconazole, 100, 30, 10, 3, 1, 0.3, 0 µM). A 200 × concentration of substrate working solution (120 µM of diclofenac, 400 µM of dextromethorphan, and 200 µM of midazolam) was prepared in water, acetonitrile, or acetonitrile/methanol. 3. 2 µl of 20 mg/ml liver microsome solution, 1 µl of substrate working solution, 1 µl of compound working solution and 176 µl of PBS buffer were taken, mixed uniformly, and pre-incubated in a 37° C. water bath for 15 minutes. To the positive control group was added 1 µl of diclofenac, dextromethorphan or midazolam working solution to replace the compound working solution. Simultaneously, 10 mM of NADPH solution was pre-incubated together in a 37° C. water bath for 15 minutes. After 15 minutes, 20 µl of NADPH was added to each well to initiate the reaction, and the reaction was incubated at 37° C. for 5 minutes (CYP2C9) or 20 minutes (CYP2D6). Double samples were set for all incubation samples. After incubation for corresponding time, the reaction was terminated by adding 400 ul of ice methanol containing an internal standard to all samples. The mixture was mixed uniformly by vortex and centrifuged at 3220 g at 4° C. for 40 minutes. After centrifugation, 100 µL of the supernatant was transferred to a loading plate, and 100 µL of ultrapure water was added and mixed uniformly for LC-MS/MS analysis. |
| Affinity data for this assay | |
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