| Assay Method Information | |
| | Dopamine D2 Receptor Binding Assay |
| Description: | In this test, the dopamine D2 receptor binding activity of each test compound was measured using GeneBLAzer D2-Gqo5-NEAT-bla CHO-K1 Cell-based Assay (Thermo Fisher Scientific, Inc.). The CHO cells are designed such that a signal transduction pathway is activated by addition of a drug to express a reporter gene (P lactamase). By the action of the expressed R lactamase, a Forster resonance energy transfer (FRET) substrate shifts from green fluorescence (520 nm) to blue fluorescence (447 nm). Therefore, the binding activity of the test compound can be measured by measuring a blue fluorescence/green fluorescence ratio. The CHO cells were inoculated at 10,000 cells/well to a 384-well plate and cultured for 16 to 20 hours in a CO2 incubator. Serially diluted solutions of each of the test compound and an agonist (apomorphine) were added to the cells, which were then cultured for 5 hours in a CO2 incubator. A substrate mix was added to the cells and incubated at room temperature for 2 hours. Then, green fluorescence and blue fluorescence were measured using Multimode Plate Reader EnVision 2105 (Perkin Elmer, Inc.), and a blue fluorescence/green fluorescence ratio was calculated. The respective EC50 values of the test compounds were determined from the measured fluorescence ratios using GraphPad Prism 8. |
| Affinity data for this assay | |
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