| Assay Method Information | |
| | Inhibition Assay |
| Description: | The potential inhibition of enzyme activities of human cytochromes P450 (CYP) of Compound 1, 2, or 105 was evaluated using pooled human liver microsomes.Methods: The competitive inhibition potential of Compounds 1, 2, and 105 was determined by assessing at multiple concentrations on probe CYP reactions near their respective Km values to create IC50 curves in human liver microsomes (HLM). The time-dependent inactivation (TDI) potential was also assessed for CYP3A4/5 by evaluating KI and kinact values when appropriate.A suspension containing PB, HLM, CYP-selective probe substrate, and the inhibitor being tested was added to a 96-well plate. The plates were preincubated in a 37 ° C. water bath for approximately 2 minutes. The reaction was initiated by the addition of NADPH to each well of the 96-well plate. The final concentrations for PB, HLM, and NADPH were 100 mmol/L (pH 7.4), 0.1 mg/mL, and 2.3 mmol/L, respectively. The CYP probe substrates and CYP inhibitors used as positive controls. |
| Affinity data for this assay | |
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