| Assay Method Information | |
| | Competitive Binding Assay |
| Description: | Table 11: Receptor membranes were prepared from the CHO-K1 recombinant AequoScreen® cell line stably expressing the human 5-HT2A receptor (PerkinElmer, Waltham, MA, USA). Cells were suspended in 4× volume in buffer A (15 mM Tris-HCl, pH 7.5, 2 mM MgCl2, 0.3 mM EDTA, 1 mM EGTA) (1 g cell-4 mL buffer) and homogenized in a Dounce homogenizer. The crude membrane fraction was collected following two consecutive centrifugation steps at 40,000×g for 25 minutes separated by a washing step in buffer A. The final pellet was resuspended in buffer B (75 mM Tris-HCl, pH 7.5, 12.5 mM MgCl2, 0.3 mM EDTA, 1 mM EGTA, 250 mM sucrose) in a concentration of 80 mg wet cell weight in 0.5 mL buffer, aliquoted and flash frozen on dry ice. Protein content was determined using the bicinchoninic acid assay in the presence of sulfhydryl reagents with bovine serum albumin (BSA) as a standard.In binding experiments, 15 μg protein/well membrane preparation and 1 nM ketanserin hydrochloride, [ethylene-3H] (PerkinElmer) as radioligand were incubated with compounds or vehicle (DMSO, 1% (v/v) final concentration) in an incubation buffer (50 mM Tris, 0.3% BSA, pH 7.4). Non-specific binding (NSB) was determined in the presence of 1 μM mianserin hydrochloride (Tocris, Bristol, UK). Samples were incubated in a final volume of 250 μL for 15 minutes at 25° C. Binding reactions were terminated by rapid filtration through a Filtermate™ harvester (PerkinElmer) using UniFilter® GF/C plates pre-soaked for at least 1 hour in 0.5% (v/v) polyethylene imine (PEI, dissolved in distilled water). The filter plates were washed three times with 0.5 mL of ice-cold washing buffer (50 mM Tris, pH 7.4). Washed filter plates were dried at 40° C. for 60 minutes and 40 μL of Microscint™-20 scintillation cocktail (PerkinElmer) was added to each well. Radioactivity was determined with a MicroBeta2® microplate counter (PerkinElmer). |
| Affinity data for this assay | |
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