| Assay Method Information | |
| | GABAA Receptor Binding Assay |
| Description: | Rat brain membranes were prepared from frozen tissue that was thawed on ice and homogenized on ice in 10 volumes of cold lysis buffer (50 mM Tris HCl, pH 7.4, containing protease inhibitor cocktail; Roche) using a Polytron homogenizer (6 pulses and 10 seconds per pulse). The homogenate was centrifuged at 1,000×g for 10 min at 4° C. to obtain the supernatant. The supernatant was then centrifuged at 40,000×g for 20 min, and the resulting supernatant decanted and replaced with the same ice-cold lysis buffer. Two or three additional rounds of homogenization-centrifugation were performed to ensure thorough homogenization and wash out endogenous ligands. The final pellet was resuspended in the same buffer and homogenized one last time. The rat brain suspension was diluted in buffer (50 mM Tris HCl, 2.5 mM CaCl2, pH 7.4), followed by the addition of [3H]-flunitrazepam (0.6-4.0 nM in DMSO) and PI320 or PI310 in DMSO at different concentrations to reach a final of volume of 125 μl per well. Total binding and nonspecific binding were determined with reference compound clonazepam. In brief, plates are usually incubated at room temperature and in the dark for 90 min. Reactions are stopped by vacuum filtration onto 0.3% polyethyleneimine (PEI) soaked 96-well filter mats using a 96-well Filtermate harvester, followed by three washes with cold PBS buffer. Scintillation cocktail was then melted onto the microwave-dried filters on a hot plate and radioactivity counted in a Microbeta counter. |
| Affinity data for this assay | |
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