Parallel dopamine D1 receptor activity dependence of l-Dopa-induced normal movement and dyskinesia in mice.

Parallel dopamine D1 receptor activity dependence of l-Dopa-induced normal movement and dyskinesia in mice.
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DOI:
10.1016/j.neuroscience.2012.12.065
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发表时间:
2013-04-16
期刊:
影响因子:
3.3
通讯作者:
Zhou, F. -M.
Zhou, F. -M.
中科院分区:
医学3区
文献类型:
--
作者:
Li, L.;Zhou, F. -M.

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左旋多巴引起的帕金森病(PD)运动障碍是一个主要的临床问题。流行的观点是,在PD患者和动物PD模型中,运动障碍在重复使用L-多巴或引发后发展,独立于立即发生的L-多巴的抗PD治疗效果。在这里,我们表明,在小鼠的背侧纹状体严重和一致的多巴胺(DA)的损失,使转录因子Pitx 3无效突变,第一次注射L-多巴或D1样激动剂SKF 81297诱导正常的走动和运动障碍的运动。此外,对正常和运动障碍运动的强烈刺激作用具有相同的时间过程和平行的剂量-反应曲线。相反,D2样激动剂罗匹尼罗刺激正常和运动障碍的运动相对温和。这些结果表明,严重的DA损失在背侧纹状体设置阶段的运动障碍发生在第一次暴露于L-多巴或D1激动剂没有任何启动。这些结果也表明,左旋多巴刺激正常和运动障碍的运动主要通过D1受体激活和适当的D1激动剂是一种有效的治疗PD运动缺陷。
L-dopa-induced dyskinesia in Parkinson’s disease (PD) is a major clinical problem. The prevailing view is that in PD patients and animal PD models dyskinesia develops after repeated L-dopa use or priming, independent of L-dopa’s anti-PD therapeutic effect that occurs immediately. Here we show that in mice with severe and consistent dopamine (DA) loss in the dorsal striatum, rendered by transcription factor Pitx3 null mutation, the very first injection of L-dopa or D1-like agonist SKF81297 induced both normal ambulatory and dyskinetic movements. Furthermore, the robust stimulating effects on normal and dyskinetic movements had an identical time course and parallel dose-response curves. In contrast, D2-like agonist ropinirole stimulated normal and dyskinetic movements relatively modestly. These results demonstrate that severe DA loss in the dorsal striatum sets the stage for dyskinesia to occur on the first exposure to L-dopa or a D1 agonist without any priming. These results also indicate that L-dopa stimulated both normal and dyskinetic movements primarily via D1 receptor activation and that proper D1 agonism is potentially an efficacious therapy for PD motor deficits.
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