大麻素 CB1 受体激动剂 arachydonilcyclopropylamide(ACPA)在大鼠杏仁核中产生的抗焦虑样作用是通过 D1 和 D2 多巴胺能系统介导的。
Anxiolytic-like effect induced by the cannabinoid CB1 receptor agonist, arachydonilcyclopropylamide (ACPA), in the rat amygdala is mediated through the D1 and D2 dopaminergic systems.
机构信息
Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
出版信息
J Psychopharmacol. 2011 Jan;25(1):131-40. doi: 10.1177/0269881110376688. Epub 2010 Aug 4.
In the present study the influence of the dopaminergic system(s) of the amygdala on the anxiolytic-like effect of the cannabinoid CB1 receptor agonist, arachydonilcyclopropylamide (ACPA), in male Wistar rats was investigated. An elevated plus-maze test of anxiety was used to assess anxiety-like behaviors. The results showed that bilateral intra-amygdala injections of ACPA (0.125, 1.25 and 5 ng/rat) and the mixed dopamine D1/D2 receptor agonist, apomorphine, at different doses (0.001, 0.01 and 0.1 µg/rat) increased percentage open arm time (%OAT) and percentage open arm entries (%OAE), indicating an anxiolytic-like effect for both of the drugs. In contrast, intra-amygdala administration of the dopamine D1 receptor antagonist SCH23390 (0.5 and 1 µg/rat) and the dopamine D2 receptor antagonist, sulpiride (2 and 3 µg/rat) decreased %OAT and %OAE, suggesting an anxiogenic-like effect for both of the drugs. Interestingly, pretreatment with a sub-effective dose of apomorphine (0.0005 µg/rat) increased, while SCH23390 (0.25 µg/rat) and sulpiride (1.5 µg/rat) decreased the anxiolytic-like effect of ACPA. It can be concluded that the dopaminergic system of the amygdala may be involved, at least partly, in the anxiolytic-like effects induced by ACPA in the rat amygdala.
在本研究中,研究了杏仁核多巴胺能系统对大麻素 CB1 受体激动剂 arachydonilcyclopropylamide (ACPA) 的抗焦虑样作用的影响。焦虑的高架十字迷宫试验用于评估焦虑样行为。结果表明,双侧杏仁核内注射 ACPA(0.125、1.25 和 5ng/大鼠)和混合多巴胺 D1/D2 受体激动剂阿朴吗啡,在不同剂量(0.001、0.01 和 0.1μg/大鼠)增加开放臂时间百分比(%OAT)和开放臂进入次数百分比(%OAE),表明两种药物均具有抗焦虑样作用。相比之下,杏仁核内给予多巴胺 D1 受体拮抗剂 SCH23390(0.5 和 1μg/大鼠)和多巴胺 D2 受体拮抗剂舒必利(2 和 3μg/大鼠)减少%OAT 和%OAE,表明两种药物均具有焦虑样作用。有趣的是,亚有效剂量的阿朴吗啡(0.0005μg/大鼠)预处理增加,而 SCH23390(0.25μg/大鼠)和舒必利(1.5μg/大鼠)降低 ACPA 的抗焦虑样作用。可以得出结论,杏仁核的多巴胺能系统可能至少部分参与了 ACPA 在大鼠杏仁核中诱导的抗焦虑样作用。