Selective activation of striatal fast-spiking interneurons during choice execution.

Selective activation of striatal fast-spiking interneurons during choice execution.
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DOI:
10.1016/j.neuron.2010.06.034
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发表时间:
2010-08-12
期刊:
影响因子:
16.2
通讯作者:
Berke, Joshua D.
Berke, Joshua D.
中科院分区:
医学1区
文献类型:
--
作者:
Gage, Gregory J.;Stoetzner, Colin R.;Wiltschko, Alexander B.;Berke, Joshua D.

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基底神经节回路对于组织和执行自主行动至关重要。在纹状体中,快速尖峰中间神经元(FSIs)被认为通过前馈抑制严格调节中棘投射神经元(MSN)的活动,但很少有研究调查 FSI 对行为动物的功能贡献。我们在执行简单选择任务的大鼠中记录了假定的 MSN 和 FSI 以及运动皮层和苍白球 (GP) 神经元。 MSN 活动广泛分布在整个任务序列中,尤其是在奖励接收附近。相比之下,随着所选行动的启动,FSI 显示出活动增加的协调脉冲,同时 GP 活动急剧下降。 MSN 和 FSI 都具有方向选择性,但相邻的 MSN 和 FSI 表现出相反的选择性。我们的研究结果表明,个体 FSI 参与局部纹状体信息处理,但 GP 对 FSI 进行更全面的去抑制对于启动选定的行动同时抑制不需要的替代方案非常重要。
Basal ganglia circuits are essential for the organization and execution of voluntary actions. Within the striatum, fast-spiking interneurons (FSIs) are thought to tightly regulate the activity of medium-spiny projection neurons (MSNs) through feed-forward inhibition, yet few studies have investigated the functional contributions of FSIs in behaving animals. We recorded presumed MSNs and FSIs together with motor cortex and globus pallidus (GP) neurons, in rats performing a simple choice task. MSN activity was widely distributed across the task sequence, especially near reward receipt. By contrast, FSIs showed a coordinated pulse of increased activity as chosen actions were initiated, in conjunction with a sharp decrease in GP activity. Both MSNs and FSIs were direction-selective, but neighboring MSNs and FSIs showed opposite selectivity. Our findings suggest that individual FSIs participate in local striatal information processing, but more global disinhibition of FSIs by GP is important for initiating chosen actions while suppressing unwanted alternatives.
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