Principles of Synaptic Organization of GABAergic Interneurons in the Striatum.

Principles of Synaptic Organization of GABAergic Interneurons in the Striatum.
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DOI:
10.1016/j.neuron.2016.09.007
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发表时间:
2016-10-05
期刊:
影响因子:
16.2
通讯作者:
Sabatini BL
Sabatini BL
中科院分区:
医学1区
文献类型:
--
作者:
Straub C;Saulnier JL;Bègue A;Feng DD;Huang KW;Sabatini BL

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纹状体是基底节的入口核,其主细胞缺乏层状或柱状组织;然而,功能数据表明它在空间上是有组织的。在这里,我们研究纹状体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。针对纹状体GABA能中间神经元的两类主要类型(快脉冲(FSIS)和低阈值脉冲中间神经元(LTSI)),我们应用光遗传学和病毒示踪相结合的方法来解剖小鼠的纹状体微循环。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。FSIS专门针对邻近的棘突投射神经元(SPN),并在近端的躯体树突区域形成强大的突触。相反,LTSI针对SPN和胆碱能中间神经元,与SPN的突触连接仅在远距离和远端树突上进行。这些结果表明,FSIS和LTSI在塑造纹状体输出方面具有根本不同的功能。
The striatum, 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 can contribute to such spatial organization. Focusing on the two main classes of striatal GABAergic interneurons (fast-spiking (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 spiny 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.
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