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后突触多巴胺D3受体选择性调节μ-阿片类受体表达GABAergic输入到CA1金字塔细胞在老鼠腹部海马

Kyle A Brown^1,2, Michael Stramiello^1,3, Jason K Clark¹

¹Department of Physiology & Pharmacology, University of Georgia, Athens, Georgia, United States.

Journal of neurophysiology

|November 21, 2024

概括

腹部海马CA1神经元上的多巴胺D3受体是由μ-阿片类受体表达内神经元的抑制输入调节的. 这种相互作用塑造了神经传递,可能会影响突触可塑性和网络振荡.

科学领域:

神经科学是一个神经科学.
神经生理学神经生理学
突触性可塑性突触性可塑性

背景情况:

多巴胺在动机和认知中的作用已经确立,但其在腹部海马CA1子场中的特定功能仍然不清楚.
在CA1金字塔细胞上的多巴胺D3受体 (D3Rs) 可能调节突触可塑性,但对神经内部影响的理解较少.

研究的目的:

为了研究表达μ-阿片类受体 (MOR) 的抑制性内部神经元是否能调节大鼠腹腔海马 (vH) 中的CA1主细胞上的突触后D3Rs.
阐明这些相互作用在塑造vH神经传递中的作用.

主要方法:

在老鼠的vH切片中使用全细胞电压技术来测量引起的抑制后突触电流 (eIPSCs).
在急性分离的vH CA1神经元中测量GABA A电流.
使用MOR激动剂DAMGO和D3R激动剂PD128907.7的应用

主要成果:

DAMGO和PD128907都在CA1神经元中抑制了eIPSCs;DAMGO预处理封闭了PD128907的作用.
D3R激活抑制了GABA A电流,表明了后突触D3R的局部化.
动态变化表明,MOR表达的GABAergic输入有选择地准CA1主细胞上的突触后D3Rs.

结论:

在CA1主细胞上,后突触D3R被MOR表达的GABAergic输入选择性地准.
通过多巴胺和阿片类药物活性进行这种调节可能会消毒vH刺激性神经传递.
研究结果表明,一种机制影响了内腔海马体中的突触可塑性和网络振荡.

关键词:

多巴胺D3受体的受体内部神经元内部神经元神经状细胞是神经状细胞.腹部海马的一个海马体.μ-阿片类受体的受体

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