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The dopamine antagonist cis-flupenthixol blocks the expression of the conditioned positive but not the negative effects of cocaine in rats

机译:多巴胺拮抗剂顺式氟哌丁醇可阻断可卡因在大鼠中的表达但不能抑制其表达

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摘要

Human cocaine users report that the initial “high” produced by cocaine administration is followed by an anxiogenic “crash”. Given that cocaine has such robust and opposing properties, it is likely that both the positive and negative effects of cocaine contribute to an individual’s motivation to administer the drug. Despite this likelihood, the neurobiology underlying cocaine’s dual processes remains unclear. While much literature supports a role for dopamine (DA) in cocaine reward, it is uncertain if DA also contributes to the drug’s negative effects. Our laboratory has extensively utilized a modified conditioned place test to explore cocaine’s opponent processes. In this paradigm rats develop conditioned place preferences (CPPs) for an environment paired with the immediate/positive effects of cocaine, and conditioned place aversions (CPAs) for an environment paired with the delayedegative effects present 15-min after i.v. injection. In the current study rats were conditioned to associate an environment with either the immediate or delayed effects of i.v. cocaine (1 mg/kg/0.1 ml) three hours after i.p. pre-treatment with either the DA D1/D2 receptor antagonist cis-flupenthixol (0.5 mg/kg/ml) or saline vehicle. As expected, vehicle-treated control animals developed the normal pattern of CPPs for cocaine’s immediate effects or CPAs for the delayed effects of cocaine. However, while DA receptor antagonism prevented the expression of cocaine CPPs it did not alter the expression of cocaine-induced CPAs. These data confirm a role for DA transmission in cocaine reward but suggest that different neural pathways mediate the drug’s negative/anxiogenic properties.
机译:人类可卡因使用者报告说,可卡因使用最初产生的“高”,然后是焦虑症“崩溃”。鉴于可卡因具有如此强壮和相反的特性,可卡因的正面和负面影响都可能有助于个人使用该药物的动机。尽管有这种可能性,可卡因双重过程的神经生物学仍不清楚。尽管许多文献都支持多巴胺(DA)在可卡因奖赏中的作用,但尚不确定DA是否也有助于该药的负面作用。我们的实验室已广泛利用改良的条件放置测试来探索可卡因的对手药过程。在这种范例中,大鼠在i.v.后15分钟出现针对与可卡因的即时/阳性效应配对的环境的条件位置偏好(CPP),而针对与延迟/阴性效应配对的环境的条件位置厌恶(CPA)。注射。在当前的研究中,将大鼠适应于使环境与静脉内注射的立即或延迟作用相关。腹腔注射后三小时可卡因(1 mg / kg / 0.1 ml)用DA D1 / D2受体拮抗剂顺氟喷海醇(0.5 mg / kg / ml)或盐水溶媒预处理。如预期的那样,用媒介物治疗的对照动物形成了可卡因即时作用的正常CPP或可卡因延迟作用的CPA。但是,尽管DA受体拮抗作用阻止了可卡因CPP的表达,但它并没有改变可卡因诱导的CPA的表达。这些数据证实了DA传递在可卡因报酬中的作用,但表明不同的神经途径介导了该药物的负性/焦虑性特性。

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