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
中科院分区:
文献类型:
--
作者:
Straub C;Saulnier JL;Bègue A;Feng DD;Huang KW;Sabatini BL
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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