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| | Assay for Binding Affinity for Adenosine Receptor A2 |
| Description: | HEK-293 cell membrane homogenates (40 μg protein), in which A2a adenosine receptors were expressed, are incubated for 120 min at 22° C. with 6 nM [3H]CGS 21680 in the absence or presence of the test compound in a buffer containing 50 mM Tris-HCl (pH 7.4), 10 mM MgCl2 and 2 UI/ml ADA. Nonspecific binding is determined in the presence of 10 μM NECA. Following incubation, the samples are filtered rapidly under vacuum through glass fiber filters (GF/B, Packard) presoaked with 0.3% PEI and rinsed several times with ice-cold 50 mM Tris-HCl using a 96-sample cell harvester (Unifilter, Packard). The filters are dried then counted for radioactivity in a scintillation counter (Topcount, Packard) using a scintillation cocktail (Microscint 0, Packard). The results are expressed as a percent inhibition of the control radioligand specific binding. The standard reference compound is NECA, which is tested in each experiment at several concentrations to obtain a competition curve from which its IC50 is calculated. |
| Affinity data for this assay | |
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