| Assay Method Information | |
| | Evaluation of Activating Activity for OX1R and OX2R |
| Description: | Human Embryonic Kidney cells 293 (HEK293) cells with forced expression of hOX1R or hOX2R were seeded in a 384-well microplate (Greiner) at 10,000 per well and cultured for 1 day in high-glucose-DMEM (FujiFilm Corp. Wako Pure Chemical Industries, Ltd.) containing added 10% FBS (Thermo Scientific) and 1% Penicillin-Streptomycin (FujiFilm Corp. Wako Pure Chemical Industries, Ltd.). After removing the medium, 30 μL of assay buffer (20 mM HEPES (Sigma-Aldrich Japan, KK.), Hank's balanced salt solution (Gibco), 0.1% BSA (Sigma-Aldrich Japan, KK.), 0.1% Pluronic F-127 (Invitrogen)) containing Calcium 4 dye (Molecular Device Corporation) and 2.5 mM probenecid (Sigma-Aldrich Japan, KK.) were added, and the mixture was incubated for 60 minutes. A 30 μL portion of assay buffer containing the test compound was added and reaction was initiated. Change in intracellular calcium ion concentration by the reaction was measured based on the fluorescence intensity ratio in terms of the fluorescence value with dual wavelength excitation at 480 nm and 540 nm, using FDSS7000 (Hamamatsu Photonics, K.K.). The test compound was dissolved in DMSO to 10 mM, and diluted with assay buffer to a final concentration of from 3×10−11 M to 1×10−5 M (DMSO final concentration of 0.1%). The EC50 value was determined from the fluorescence value with addition of the test compound at different concentrations, with the fluorescence value of the well with compound-free buffer added as 0%, and the fluorescence value of the well with 30 nM OX-A (Peptide Research Lab) as 100%. |
| Affinity data for this assay | |
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