Synthesis and Characterization of NESS 0327: A Novel Putative Antagonist of the CB<sub>1</sub>Cannabinoid Receptor
作者:Stefania Ruiu、Gèrard A. Pinna、Giorgio Marchese、Jean-Mario Mussinu、Pierluigi Saba、Simone Tambaro、Paola Casti、Romina Vargiu、Luca Pani
DOI:10.1124/jpet.103.049924
日期:2003.7
The compound N -piperidinyl-\[8-chloro-1-(2,4-dichlorophenyl)-1,4,5,6-tetrahydrobenzo [6,7]cyclohepta[1,2- c ]pyrazole-3-carboxamide\] (NESS 0327) was synthesized and evaluated for binding affinity toward cannabinoid CB1 and CB2 receptor. NESS 0327 exhibited a stronger selectivity for CB1 receptor compared with N -piperidinyl-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1 H -pyrazole-3-carboxamide (SR 141716A), showing a much higher affinity for CB1 receptor ( K i = 350 ± 5 fM and 1.8 ± 0.075 nM, respectively) and a higher affinity for the CB2 receptor ( K i = 21 ± 0.5 nM and 514 ± 30 nM, respectively). Affinity ratios demonstrated that NESS 0327 was more than 60,000-fold selective for the CB1 receptor, whereas SR 141716A only 285-fold. NESS 0327 alone did not produce concentration-dependent stimulation of guanosine 5′- O -(3-[35S]thio)-triphosphate ([35S]GTPγS) binding in rat cerebella membranes. Conversely, NESS 0327 antagonized \[ R (+)-[2,3-dihydro-5-methyl-3-[(morpholinyl)methyl]pyrolol [1,2,3-de]-1,4-benzoxazin-yl]-(1-naphthalenyl)methanone mesylate\] (WIN 55,212-2)-stimulated [35S]GTPγS binding. In functional assay, NESS 0327 antagonized the inhibitory effects of WIN 55,212-2 on electrically evoked contractions in mouse isolated vas deferens preparations with p A 2 value of 12.46 ± 0.23. In vivo studies indicated that NESS 0327 antagonized the antinociceptive effect produced by WIN 55,212-2 (2 mg/kg s.c.) in both tail-flick (ID50 = 0.042 ± 0.01 mg/kg i.p.) and hot-plate test (ID50 = 0.018 ± 0.006 mg/kg i.p.). These results indicated that NESS 0327 is a novel cannabinoid antagonist with high selectivity for the cannabinoid CB1 receptor.
化合物 N -哌啶基-\[8-氯-1-(2,4-二氯苯)-1,4,5,6-四氢苯并[6,7]环庚[1,2-c]吡唑-3-羧酰胺\] (NESS 0327) 被合成并评估其与大麻素 CB1 和 CB2 受体的结合亲和力。NESS 0327 对 CB1 受体表现出比 N -哌啶基-5-(4-氯苯)-1-(2,4-二氯苯)-4-甲基-1H-吡唑-3-羧酰胺 (SR 141716A) 更强的选择性,显示出对 CB1 受体的亲和力显著更高 (K i = 350 ± 5 fM 和 1.8 ± 0.075 nM,分别) 并且对 CB2 受体的亲和力也更高 (K i = 21 ± 0.5 nM 和 514 ± 30 nM,分别)。亲和力比率表明 NESS 0327 对 CB1 受体的选择性超过 60,000 倍,而 SR 141716A 仅为 285 倍。NESS 0327 单独并未导致大鼠小脑膜的鸟苷酸 5′-O-(3-[35S]硫)-三磷酸 ([35S]GTPγS) 结合的浓度依赖性刺激。相反,NESS 0327 拮抗了\[ R (+)-[2,3-二氢-5-甲基-3-[(吗啉基)甲基]吡咯[1,2,3-de]-1,4-苯并噁唑]-(1-萘基)]甲酰甲基磺酸酯\] (WIN 55,212-2) 刺激的 [35S]GTPγS 结合。在功能性实验中,NESS 0327 拮抗了 WIN 55,212-2 在小鼠孤立输精管准备中电刺激收缩的抑制效果,其 p A 2 值为 12.46 ± 0.23。体内研究表明 NESS 0327 拮抗了 WIN 55,212-2 (2 mg/kg s.c.) 产生的镇痛效果,在尾部抽搐 (ID50 = 0.042 ± 0.01 mg/kg i.p.) 和热板测试 (ID50 = 0.018 ± 0.006 mg/kg i.p.) 中均显示出效果。这些结果表明 NESS 0327 是一种对大麻素 CB1 受体具有高选择性的新型大麻素拮抗剂。