| Assay Method Information | |
| | Radioligand Binding Assay |
| Description: | Radioligand dose-displacement binding assays for u-opioid receptors used 0.2nM[3H]-diprenorphine (NEN, Boston, Mass.), with 5-20mg membrane protein/well in a final volume of 500 uL binding buffer (10mM MgCl2, 1mM EDTA, 5% DMSO, 50mM HEPES, pH 7.4). Reactions were carried out in the absence or presence of increasing concentrations of unlabeled naloxone. All reactions were conducted in 96-deep well polypropylene plates for 1-2 hr at about 25C. Binding reactions were terminated by rapid filtration onto 96-well Unifilter GF/C filter plates (Packard, Meriden, Conn.) presoaked in 0.5% polyethylemimine using a 96-well tissue harvester (Brandel, Gaithersburg, Md.) followed by performing three filtration washes with 500uL of ice-cold binding buffer. Filter plates were subsequently dried at 50C for 2-3 hours. BetaScint scintillation cocktail (Wallac, Turku, Finland) was added (50uL/well), and plates were counted using a Packard Top-Count for 1 min/well. |
| Affinity data for this assay | |
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