| Assay Method Information | |
| | Binding Assay |
| Description: | Cell culture: 293 HEK cells, stably transfected with plasmids capable of expressing human P2X7 receptor, were cultured by standard methods. Cells were plated to cell density of approximately 15,000 cells/well in 384-well assay plates (50 μl/well) with 1.5% low serum media (DMEM, 1.5% BCS, 1% L-glut (2 mM), 1% P/S).293 HEK cells, stably transfected with plasmids capable of expressing rat or mouse P2X7 receptor, were cultured by standard methods. Cells were plated to cell density of approximately 15,000 cells/well in 384-well assay plates (50 μl/well) with 1.5% low serum media (DMEM, 1.5% FBS, 1% L-glut (2 mM), 10 mM HEPES, 1% P/S). Cells were plated 24 hours prior to assay. Cells expressing human, rat or mouse P2X7 receptor were assayed in the following manner.Fluorescent Imaging Plate Reader (FLIPR) assay: Briefly, 293-human or mouse P2X7 stable cells were incubated in sucrose buffer, pH 7.4 [KCl (5 mM), NaH2PO4.2H2O (9.6 mM), HEPES (25 mM), sucrose (280 mM), glucose (5 mM), CaCl2 (0.5 mM), and probenecid (0.1425 g in 3 mL 1N NaOH was added for 500 mL solution)] in 384-well plates.293-rat P2X7 stable cells were incubated in HHPB (pH 7.4) [consisting of Hank's BSS (1×); HEPES (pH 7.4) (20 mM) (Sigma); probenecid (0.710 g/5 mL 1N NaOH) (Sigma); and BSA (0.05%) (Roche) which was added after the pH had been adjusted] in 384-well plates. Fluo-4 NW dye mix (Molecular Probes, Inc., Eugene, Oreg., USA) was prepared in buffer (see manufacturer's instructions). Cell plates were removed from the 37° C. incubator, the media discarded and then 30 μL of dye was added to each well. Plates were placed in the 37° C., non-CO2 incubator for 30 minutes and then room temperature for 30 minutes. |
| Affinity data for this assay | |
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