| Assay Method Information | |
| | Binding Assay |
| Description: | Receptor binding assays were performed using crude membranes prepared from CHO cells expressing human NK3 receptor. Osanetant (SR142801), a non-peptide NK3 antagonist, was used as a ligand, and SB222200 was used as a positive control reference compound. The assay was performed with cell membrane homogenates (24 ug protein) incubated for 120 min at 22 C. with 0.4 nM [3H]SR142801 in the absence or presence of the test compound in a buffer containing 20 mM Hepes/NaOH (pH 7.4), 120 mM NaCl, 1 mM MnCl2, 0.01% bacitracin, 0.002% aprotinin and 0.1% BSA. Following incubation, the samples were filtered rapidly under vacuum through glass fiber filters (GF/B, Packard) that had been presoaked with 0.3% PEI. The filters were rinsed several times with ice-cold 50 mM Tris/HCl using a 96-sample cell harvester (Unifilter, Packard), dried, and counted for radioactivity in a scintillation counter (Topcount, Packard) using a scintillation cocktail (Microscint 0, Packard). |
| Affinity data for this assay | |
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