CHEMBL5731959

Binding of Compound 102 to Dopamine D2 Receptors (Membrane Preparation): The ability of Compound 102 to bind the dopamine D2 receptor in a membrane preparation was examined. Medium was removed from dopamine D2 receptor cells and washed with PBS. A lysis buffer (250 mM sucrose, 1 nM EDTA, 10 mM Tris HCl buffered at pH 7.2 plus protease inhibitors) was added and cells scrapped using a plate scrapper. Cells were homogenized with 20 manual up and down strokes in a glass homogenizer. Intact cells, nuclei, and cell debris were removed by centrifugation of the homogenate at 500× g for 10 minutes at 4° C., the supernatant was removed, and the pellet resuspended in assay buffer. Membrane preparations were incubated with 3H spiperone until equilibration. Separation of bound from free radioligand was carried out using a Packard Filtermate Harvester and glass filter plates. Radioactivity was measured using a Packard Topcount. To 20 μL of D2 membranes were mixed 20 μL of 3H spiperone and 10 μL test compound or reference ligand in binding buffer in a nonbinding 96 well plate, and incubated for <120 minutes. Prior to filtration, a 96 well harvest filter plate was coated with 0.33% polyethyleneimine for 30 minutes and then washed with assay buffer. The binding reaction was transferred to the filter plate and washed three times with wash buffer, dried, scintillant added, and radioactivity counted on a Topcount NXT.