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多巴胺基输入调节间接路径状脊髓神经元对来自大脑的神经营养因子的敏感性

Maurilyn Ayon-Olivas¹, Daniel Wolf¹, Thomas Andreska¹

¹Institute of Clinical Neurobiology, University Hospital Wuerzburg, 97078 Wuerzburg, Germany.

|October 27, 2023

概括

多巴胺受体D2 (DRD2) 的刺激会收回TrkB,影响帕金森病 (PD) 中的突触可塑性. 这与DRD1效应形成鲜明对比,并可能解释条状神经元中的PD病理生理学.

科学领域:

神经科学是一个神经科学.
分子生物学分子生物学
神经退行性疾病神经退行性疾病

背景情况:

帕金森病 (PD) 涉及由于带性多巴胺基耗尽和改变皮质带性突触可塑性而导致的运动缺陷.
多巴胺受体D1 (DRD1) 和D2 (DRD2) 信号差异性调节长期增强 (LTP) 和长期抑郁 (LTD) 在条状脊状投射神经元 (SPN) 中.
大脑衍生神经营养因子 (BDNF) 和它的受体热氨酸受体激酶B (TrkB) 是突触可塑性的关键调节者.

研究的目的:

研究DRD2激活对TrkB局部化的作用及其对帕金森病模型中突触可塑性的影响.
阐明DRD1和DRD2刺激对直接和间接通路SPN中的TrkB信号的对立作用.
在PD的遗传小鼠模型中检查BDNF/TrkB信号失调.

主要方法:

来自野生型和Pitx3型小鼠的初级条状神经元培养物.
免疫细胞化学测试以评估TrkB在血和细胞内部的局部定位.
对DRD1和DRD2通路的药理刺激.

主要成果:

在间接通路SPN和胆固醇内部神经元中DRD2激活诱导了TrkB从等离子膜收缩.
之前已经证明DRD1激活可以在直接通路SPN中增强TrkB敏感性.
从Pitx3小鼠的直接和间接途径SPN中观察到细胞内TrkB定位,这是PD模型.

结论:

通过DRD2介导的TrkB收缩为DRD1和DRD2引起的对立突触可塑性变化提供了机制性的解释.
皮克斯3小鼠中BDNF/TrkB信号的失调可能有助于帕金森病中条状神经元的病理生理学.
针对BDNF/TrkB信号可能为PD相关的运动功能障碍提供治疗策略.

关键词:

这就是为什么BDNF是BDNF.在DRD2中,DRD2是DRD2.在GPCR中,GPCR是指GPCR.在Pitx3中使用Pitx3 这就是为什么TrkBB.基底性腺 (Basal Ganglia) 是一个胆固醇内部神经元胆固醇内部神经元皮层-状突触突触是皮层-状突触.这是iSPNs.间接路径间接路径间接路径突触性可塑性突触性可塑性

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