| Assay Method Information | |
| | Binding Scintillation Proximity Assay |
| Description: | The receptor-ligand binding Scintillation Proximity Assay (SPA) (N. D. Cook. Drug Discovery Today 1 (1996), pp. 287-294) for SSTR3 was performed with membranes isolated from Chinese hamster ovary (CHO)-K1 cells stably expressing the cloned human somatostatin receptors. Binding assays were performed in 384 well format using 125I-SS14 as the radioligand for SSTR3. The assay buffer consisted of 50 mM TrisHCl (pH 7.8) with 1 mM EGTA, 5 mM MgCl2, leupeptin (10 μg/mL), pepstatin (10 μg/mL), bacitracin (200 μg/mL), and aprotinin (0.5 μg/mL). CHO-K1 cell membranes were prebound to SPA beads and incubated with unlabelled test compounds and radiolabeled somatostatin in assay buffer. After 5 hours at room temperature, cpm/well was determined. Test compounds were examined in 10 point titrations over a range of concentrations from 0.00001 nM to 1200 nM. Percent inhibition was determined for each data point using binding in the presence of DMSO as the maximum achievable value. |
| Affinity data for this assay | |
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