Org 27569, an allosteric modulator of cannabinoid CB1 receptor, can induce a CB1 receptor state that is characterized by decreased inverse agonist affinity and enhanced agonist affinity.

ORG 27569 (3.2 和 5.6 mg/kg, i.p.) 显著抑制了大鼠[4]的可卡因相关提示诱发再启动、可卡因启动诱发再启动、甲基苯丙胺相关提示诱发再启动以及甲基苯丙胺启动诱发再启动。Org27569 (30 mg/kg, i.p.) 产生了CB1非依赖性的抑食效应，并且不影响阿纳米特(AEA)的鉴别刺激效应。Org27569（100 μg脑室内）与载体相比，不影响系统性给予CP55,940的药理效应[5]。

Equilibrium Binding Assays.: Binding assays are performed with the CB1 receptor agonist [3H]CP 55,940 (0.7 nM) and the CB1 receptor antagonist [3H]SR 141716A (1.2 nM), 1 mg/ml BSA and 50 mM Tris buffer containing 0.1 mM EDTA and 0.5 mM MgCl2, pH 7.4, in a total assay volume of 500 μl. Binding is initiated by the addition of mouse brain membranes (30 μg). Assays are carried out at 37°C for 60 min before termination by addition of ice-cold wash buffer (50 mM Tris buffer and 1 mg/ml BSA) and vacuum filtration using a 24-well sampling manifold and Whatman GF/B glass-fiber filters that have been soaked in wash buffer at 4°C for 24 h. Each reaction tube is washed five times with a 4-ml aliquot of buffer. The filters are oven-dried for 60 min and then placed in 5 ml of scintillation fluid, and radioactivity is quantitated by liquid scintillation spectrometry. Specific binding is defined as the difference between the binding that occurred in the presence and absence of 1 μM concentrations of the corresponding unlabeled ligand and is 70 to 80% of the total binding.

Cells expressing CB1 receptors are exposed to ORG27569 (10 μM) for 5 to 15 min. For toxin treatment to abrogate Gi coupling effects, PTX is added to the medium at 5 ng/ml. Following an 18-h incubation in the presence of toxin, cells are washed twice with PBS and treated with compounds. Cells are washed with ice-cold PBS, and cell lysates are obtained by harvesting the cells with ice-cold lysis buffer (150 mM NaCl, 1.0% IGEPAL CA-630, 0.5% sodium deoxycholate, 0.1% SDS, and 50 mM Tris, pH 7.5 containing 4-(2-aminoethyl)benzenesulfonyl fluoride, pepstatin A, E-64, bestatin, leupeptin, and aprotinin as protease inhibitors).(Only for Reference)