| Assay Method Information | |
| | Homogeneous Time-Resolved Fluorescence (HTRF) cAMP Antagonist Assay |
| Description: | HTRF cAMP assays were performed according to manufacturer's instructions (Cisbio, cAMP Dynamic 2 Assay Kit; #62AM4PEJ). CHO-K1 cells stably expressing recombinant receptor were harvested and suspended in warm PBS to make a 300,000 cells/mL stock. This cell suspension was dispensed into 384 well assay plates (PerkinElmer ProxiPlate #6008280) at 5 μL per well (1500 cells/well) along with a cAMP standard curve.Compounds were dissolved and serially diluted (5-fold) in DMSO to generate a 10-point dose response stock. The stock was then diluted 100-fold in assay buffer (PBS containing 1 mM IBMX) before a volume of 2.5 μL was added to the cells (the final, top concentration of compound in the dose-response is typically 10 or 100 μM). After a brief incubation, 2.5 μL of isoproterenol stock, prepared at a concentration 4 times its EC90 at the receptor of interest, was added to the wells. The EC90 for isoproterenol, a beta-adrenergic agonist, was determined in separate experiments using standard methods to measure agonist potencies.Following a 1-hour incubation at room temperature, 5 μL of cAMP-D2 Reagent diluted in Lysis Buffer was added to each well followed by 5 μL of Cryptate Reagent. Plates were further incubated at room temperature for 1 hour prior to reading. Time resolved fluorescence measurements were collected on a suitable, HTRF-capable plate reader.Counts from the plate reader were fit to the cAMP standard curve on the assay plate in order to determine cAMP concentrations in each well, and these values were used to construct dose-response curves to obtain IC50 values. |
| Affinity data for this assay | |
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