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Principles of Synaptic Organization of GABAergic Interneurons in the Striatum

机译:纹状体中γ-氨基丁酸能神经元的突触组织原理

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摘要

The striatum, the entry nucleus of the basal ganglia, lacks laminar or columnar organization of its principal cells; nevertheless, functional data suggest that it is spatially organized. Here we examine whether the connectivity and synaptic organization of striatal GABAergic interneurons contributes to such spatial organization. Focusing on the two main classes of striatal GABAergic interneurons (fast-spiking interneurons [FSIs] and low-threshold-spiking interneurons [LTSIs]), we apply a combination of optogenetics and viral tracing approaches to dissect striatal microcircuits in mice. Our results reveal fundamental differences between the synaptic organizations of both interneuron types. FSIs target exclusively striatal projection neurons (SPNs) within close proximity and form strong synapses on the proximal somatodendritic region. In contrast, LTSIs target both SPNs and cholinergic interneurons, and synaptic connections onto SPNs are made exclusively over long distances and onto distal dendrites. These results suggest fundamentally different functions of FSIs and LTSIs in shaping striatal output.
机译:纹状体是基底神经节的进入核,缺乏其主要细胞的层状或柱状组织。但是,功能数据表明它在空间上是有组织的。在这里,我们检查纹状体GABA能中间神经元的连通性和突触组织是否有助于这种空间组织。着眼于纹状体GABA能级中神经元的两个主要类别(快速加标中枢神经元[FSI]和低阈值加标中枢神经元[LTSI]),我们将光遗传学和病毒示踪方法相结合来解剖小鼠纹状体微回路。我们的结果揭示了两种中间神经元类型的突触组织之间的根本差异。 FSI仅以紧密靠近的纹状体投射神经元(SPN)为目标,并在近端的树突状树突区域形成强烈的突触。相比之下,LTSI既靶向SPN,也靶向胆碱能中神经元,并且与SPN的突触连接专门在长距离和远端树突上进行。这些结果表明,FSI和LTSI在塑造纹状体输出中具有根本不同的功能。

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