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SCH23390 Reduces Methamphetamine Self-Administration and Prevents Methamphetamine-Induced Striatal LTD

机译:SCH23390减少甲基苯丙胺自我管理并防止甲基苯丙胺诱导的纹状有限公司

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摘要

Extended-access methamphetamine self-administration results in unregulated intake of the drug; however, the role of dorsal striatal dopamine D1-like receptors (D1Rs) in the reinforcing properties of methamphetamine under extended-access conditions is unclear. Acute (ex vivo) and chronic (in vivo) methamphetamine exposure induces neuroplastic changes in the dorsal striatum, a critical region implicated in instrumental learning. For example, methamphetamine exposure alters high-frequency stimulation (HFS)-induced long-term depression in the dorsal striatum; however, the effect of methamphetamine on HFS-induced long-term potentiation (LTP) in the dorsal striatum is unknown. In the current study, dorsal striatal infusion of SCH23390, a D1R antagonist, prior to extended-access methamphetamine self-administration reduced methamphetamine addiction-like behavior. Reduced behavior was associated with reduced expression of PSD-95 in the dorsal striatum. Electrophysiological findings demonstrate that superfusion of methamphetamine reduced basal synaptic transmission and HFS-induced LTP in dorsal striatal slices, and SCH23390 prevented this effect. These results suggest that alterations in synaptic transmission and synaptic plasticity induced by acute methamphetamine via D1Rs could assist with methamphetamine-induced modification of corticostriatal circuits underlying the learning of goal-directed instrumental actions and formation of habits, mediating escalation of methamphetamine self-administration and methamphetamine addiction-like behavior.
机译:扩展接入甲基苯丙胺自我管理结果在未进行的药物摄入量;然而,在延长接入条件下,背部纹状体多巴胺D1样受体(D1R)在甲基苯丙胺的增强性质中的作用尚不清楚。急性(离体)和慢性(体内)甲基苯丙胺曝光诱导背纹状体的神经塑性变化,这是一个涉及乐器学习的关键区域。例如,甲基苯丙胺曝光会改变高频刺激(HFS) - 诱导背纹状中的长期抑郁;然而,甲基苯丙胺对背体纹状体的HFS诱导的长期增强(LTP)的影响是未知的。在目前的研究中,D1R拮抗剂的SCH2390的背部纹纹纹偏移,在延长接近甲基苯丙胺自我管理之前降低了甲基苯丙胺成瘾的行为。减少的行为与背体中的PSD-95表达减少相关。电生理调查结果表明,甲基苯丙胺的升压降低的基础突触透射和HFS诱导的背部纹状体切片中的LTP,SCH23390防止了这种效果。这些结果表明,急性甲基苯丙胺诱导的突触传递和突触塑性的改变可以有助于甲基苯丙胺诱导的皮质司机电路改性,基本上的目标导向的工具动作和习惯的形成,介导甲基苯丙胺自我给药和甲基苯丙胺升级成瘾的行为。

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