| Assay Method Information | |
| | transactivation assay |
| Description: | Human epithelial kidney cells (HEK 293) were grown to 80% confluency in Dubelcco's modified Eagles 4.5 g/L glucose medium (high glucose DMEM) containing 10% fetal bovine serum, 50 units/mL penicillin and 50 μg/mL streptomycin. The cells were trypsinized with 0.25% trypsin, then diluted to 5×105 cells/mL with high glucose DMEM. Cells were added to Costar 3917 96-well plates at 5×104 cells/well, then incubated at 37° C. for 24 hours. 1.5 μg of TR expression vector (full length TRα-CMV or TRβ-CMV), 1.5 μg of a reporter plasmid containing a DR4 thyroid hormone response element (TRE) direct repeat spaced by four nucleotides (AGGTCAcaggAGGTCA) cloned upstream of a minimal thymidine kinase promoter linked to a firefly luciferase coding sequence, and 0.75 μg of a pRL-SV40 constitutive Renilla luciferase reporter plasmid were diluted into 540 μl of OptiMEM. 27 μL of lipofectamine reagent was diluted into 540 μL of OptiMEM. The plasmid and lipofectamine dilutions were combined then incubated at RT for 10 min. The mixture was then diluted into 4.29 mL of OptiMEM. Plates were washed with 100 μL of phosphate buffered saline (PBS) at pH 7.2 without magnesium or calcium chloride per well. Transfection mixtures were added at 50 μL per well, then incubated at 37° C. for 4 hours. Modified DME/F-12 Ham's medium without phenol red containing 15 mM HEPES and bicarbonate, 5 mM L-glutamine, charcoal-stripped FBS, 50 units/mL penicillin and 50 μg/mL streptomycin was added at 50 μL per well, then the plates were incubated at 37° C. for 20 hours. Drug stocks were made at 10 mM in DMSO, then serially diluted to 1× concentrations in DME/F-12 Ham's. Plates were washed with 100 μL of PBS (pH 7.2) per well. 100 μL of each drug stock was added to the wells in triplicate, and then the plates were incubated at 37° C. for 24 hours.Cells were assayed for luciferase activity using the Promega DualGlo kit. 50 μl of Luciferase Reagent were added per well, the plate was rocked for 15 min at RT, and then the plate was read for firefly luciferase activity. A 50 μl volume of Stop & Glo Reagent was added per well, then the plate was read for Renilla luciferase activity. Data normalized to Renilla internal control were analyzed with GraphPad Prism v.4a using the sigmoid dose response model to generate EC50 valuesąSEM. |
| Affinity data for this assay | |
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