纹状体多巴胺 D1 和 D2 受体:对甲基苯丙胺诱导的多巴胺和 5-羟色胺神经毒性的广泛影响。

Striatal dopamine D1 and D2 receptors: widespread influences on methamphetamine-induced dopamine and serotonin neurotoxicity.

机构信息

Department of Neurobiology and Behavior, University of California, Irvine, California, USA.

出版信息

Synapse. 2011 Nov;65(11):1144-55. doi: 10.1002/syn.20952. Epub 2011 Aug 31.

Abstract

Methamphetamine (mAMPH) is an addictive psychostimulant drug that releases monoamines through nonexocytotic mechanisms. In animals, binge mAMPH dosing regimens deplete markers for monoamine nerve terminals, for example, dopamine and serotonin transporters (DAT and SERT), in striatum and cerebral cortex. Although the precise mechanism of mAMPH-induced damage to monoaminergic nerve terminals is uncertain, both dopamine D1 and D2 receptors are known to be important. Systemic administration of dopamine D1 or D2 receptor antagonists to rodents prevents mAMPH-induced damage to striatal dopamine nerve terminals. Because these studies employed systemic antagonist administration, the specific brain regions involved remain to be elucidated. The present study examined the contribution of dopamine D1 and D2 receptors in striatum to mAMPH-induced DAT and SERT neurotoxicities. In this experiment, either the dopamine D1 antagonist, SCH23390, or the dopamine D2 receptor antagonist, sulpiride, was intrastriatally infused during a binge mAMPH regimen. Striatal DAT and cortical, hippocampal, and amygdalar SERT were assessed as markers of mAMPH-induced neurotoxicity 1 week following binge mAMPH administration. Blockade of striatal dopamine D1 or D2 receptors during an otherwise neurotoxic binge mAMPH regimen produced widespread protection against mAMPH-induced striatal DAT loss and cortical, hippocampal, and amygdalar SERT loss. This study demonstrates that (1) dopamine D1 and D2 receptors in striatum, like nigral D1 receptors, are needed for mAMPH-induced striatal DAT reductions, (2) these same receptors are needed for mAMPH-induced SERT loss, and (3) these widespread influences of striatal dopamine receptor antagonists are likely attributable to circuits connecting basal ganglia to thalamus and cortex.

摘要

甲基苯丙胺(mAMPH)是一种成瘾性的精神兴奋剂药物,通过非胞吐机制释放单胺类物质。在动物中,狂欢式 mAMPH 给药方案会耗尽纹状体和大脑皮层中单胺神经末梢的标志物,例如多巴胺和血清素转运体(DAT 和 SERT)。尽管 mAMPH 诱导的单胺能神经末梢损伤的确切机制尚不确定,但多巴胺 D1 和 D2 受体都被认为很重要。向啮齿动物系统给予多巴胺 D1 或 D2 受体拮抗剂可防止 mAMPH 诱导的纹状体多巴胺神经末梢损伤。由于这些研究采用了系统拮抗剂给药,因此仍需要阐明涉及的特定脑区。本研究探讨了纹状体中的多巴胺 D1 和 D2 受体对 mAMPH 诱导的 DAT 和 SERT 神经毒性的贡献。在该实验中,在狂欢式 mAMPH 方案期间,纹状体中要么给予多巴胺 D1 拮抗剂 SCH23390,要么给予多巴胺 D2 受体拮抗剂 sulpiride。狂欢式 mAMPH 给药后 1 周,评估纹状体 DAT 和皮质、海马和杏仁核中的 SERT 作为 mAMPH 诱导的神经毒性的标志物。在其他情况下具有神经毒性的狂欢式 mAMPH 方案中,纹状体多巴胺 D1 或 D2 受体的阻断会产生广泛的保护作用,防止 mAMPH 诱导的纹状体 DAT 丢失和皮质、海马和杏仁核 SERT 丢失。本研究表明:(1)纹状体中的多巴胺 D1 和 D2 受体,与黑质中的 D1 受体一样,是 mAMPH 诱导的纹状体 DAT 减少所必需的;(2)这些相同的受体是 mAMPH 诱导的 SERT 丢失所必需的;(3)纹状体多巴胺受体拮抗剂的这些广泛影响可能归因于连接基底神经节与丘脑和皮层的回路。

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