| Assay Method Information | |
| | Automated Patch-Clamp Electrophysiology Functional Assay |
| Description: | Test compounds were assessed for their ability to modulate the function of the α7 nicotinic acetylcholine receptor both in the presence, and in the absence of the natural α7 agonist acetylcholine. A HEK cell line stably expressing both human RIC-3 and human α7 (PrecisION hnAChR α7/RIC-3, Eurofins Pharma, St. Charles, MO) was cultured in 175 cm2 triple-layer tissue culture flasks to no more than 90% confluency in DMEM/F-12 growth media supplemented with 10% heat-inactivated fetal bovine serum, 1% non-essential amino acids, 0.625 μg/mL Puromycin, and 400 μg/mL Geneticin. Immediately prior to assay, cells were detached by first aspirating growth media, rinsing with Dulbecco's phosphate buffered saline, and then adding 10 mL of Accutase (Innovative Cell Technologies, San Diego, CA) to the flask and then incubating at 37° C. for 5 minutes. Detached cells were then recovered by the addition of 40 mL of CHO-serum-free media supplemented with 25 mM HEPES, and rocked gently in a 50 mL conical tube for 20 minutes prior to patch-clamp assay. After recovery, cells were pelleted by centrifugation at 1,000 RPM for 1 minute in a compact bench top centrifuge; recovery media was aspirated and cells were resuspended in external recording solution (150 mM NaCl, 5 mM KCl, 2 mM CaCl2), 1 mM MgCl2, 10 mM HEPES, 12 mM dextrose) to a density of 5.0×106 cells/mL. The cell suspension was added to the cell inlet wells on an IonFlux HT population patch plate which had previously been rinsed and primed with deionized H2O. Test compounds were serially diluted in DMSO and then resuspended to the final test concentration in external recording solution, with, or without 40 μM acetylcholine added to the external recording solution; test compounds were then transferred to the IonFlux HT population patch plate. Internal recording solution (110 mM TrisPO4, 28 mM TrisBase, 0.1 mM CaCl2), 2 mM MgCl2, 11 mM EGTA, 4 mM MgATP) was added to the internal recording solution inlet wells on the IonFlux HT patch plate previously loaded with cells and test compounds, and the plate loaded into the IonFlux HT instrument. |
| Affinity data for this assay | |
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