Assay Method Information
Assay Name:  Mu-Opioid Receptor Activity Assay
Description:  Human or mouse MOR cDNA was transfected alongside GαoB with RLuc8 inserted at position 91 (GαoB-RLuc8), Gβ1 (β1), and Gγ2 fused to the full-length mVenus at its N terminus (mVenus γ2) into HEK-293T cells (5×106 cells/plate) in 10-cm dishes using PEI (Polysciences Inc.; Warrington, PA) in a 1:1 ratio diluted in Opti-MEM (Life Technologies Corp.; Grand Island, NY) to assay for G protein activation as described previously (Rives, M.-L. et al. J. Biol. Chem. 2012, 287, 27050-4; Negri, A.; Rives, M.-L.; Caspers, M. J. et al. J. Chem. Inf. Model. 2013, 53, 521-526). Cells were maintained in the Dulbecco's Modified Eagle Medium (high glucose #11965; Life Technologies) supplemented with 10% FBS (Premium Select, Atlanta Biologicals; Atlanta, GA) and 100 U/mL penicillin and 100 μg/mL streptomycin (#15140, Life Technologies). After 24 hours the media was changed, and the experiment was performed 24 hours later (48 hours after transfection). BRET. Transfected cells were dissociated and resuspended in phosphate-buffered saline (PBS). Approximately 200,000 cells/well were added to a black-framed, white well 96-well plate (#60050; Perkin Elmer; Waltham, MA). The microplate was centrifuged and the cells were resuspended in PBS. Then 5 μM of the luciferase substrate coelenterazine H was added to each well for 5 minutes. Following coelenterazine H addition, ligands were added and the BRET signal was measured at 5 minutes on a PHERAstar FS plate reader. Quantification of the BRET signal required calculating the ratio of the light emitted by the energy acceptor, mVenus (510-540 nm), over the light emitted by the energy donor, RLuc8 (485 nm). This drug-induced BRET signal was normalized using the Emax of DAMGO as the 100% maximal response for G protein activation. Dose response curves were fit using three-parameter logistics equation in GraphPad Prism 6.
Affinity data for this assay
 
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