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| | Biological Assay |
| Description: | Cell Culture and plating: HEK293 cells expressing NR1/NR2A (Chantest, Cleveland, Ohio) were grown to 70-80% confluency as an adherent monolayer in standard tissue culture flasks at 37° C., 5% CO2 per supplier's instructions. NR2A expression was induced by incubation with 0.3-0.4 μg/ml tetracycline in the presence of 4 mM ARL-15896 for 18-24 hours under the same growth conditions, then transferred to 30° C. for another 3-5 hours.After induction, cell culture medium was removed and cells were rinsed once with Ca2+ and Mg2+-free Dulbecco's phosphate buffered saline. Cells were then removed from the flask using TrypLE Express (Life Technologies) according to the manufacturer's instructions and collected to 50 ml centrifuge tubes. Following two washes in Ca2+/Mg2+-free HBSS with 20 mM HEPES (HHnoCa), cells were counted and viability assessed using trypan blue. To load cells with Ca2+-sensitive dye, they were resuspended in fluo-8 plus Component B (AAT Bioquest Products) diluted in HHnoCa and incubated 15 minutes at 37° C., followed by 30 minutes at room temp (in dark). Cells were then washed and resuspended in HHnoCa to remove extracellular dye and plated in 384-well plates (Falcon, uncoated) at 20,000-30,000 cells/well in a final volume of 25 μL/well. |
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