From dendrite to soma: dynamic routing of inhibition by complementary interneuron microcircuits in olfactory cortex.

From dendrite to soma: dynamic routing of inhibition by complementary interneuron microcircuits in olfactory cortex.
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DOI:
10.1016/j.neuron.2010.06.029
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发表时间:
2010-08-12
期刊:
影响因子:
16.2
通讯作者:
Isaacson JS
Isaacson JS
中科院分区:
医学1区
文献类型:
--
作者:
Stokes CC;Isaacson JS

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不同的抑制通路塑造了皮层信息处理;然而,相关的中间神经元被感觉刺激招募以及它们如何影响主细胞尚不清楚。在这里,我们展示了两个主要的中间神经元回路,它们控制着嗅皮层在空间和时间上的动态抑制。树突状靶向的第1层中间神经元从嗅球接受强大的输入,并管理早期起病的前馈抑制。然而,这个回路只在嗅球输入爆发时短暂使用。相比之下,体细胞靶向的第3层中间神经元,完全由锥体细胞的经常性兴奋招募,产生迟发的反馈抑制。我们的结果显示,在突发性感觉输入过程中,两个互补的神经元间回路实施广泛的抑制,从锥体细胞的顶端树突转移到体细胞。
Diverse inhibitory pathways shape cortical information processing; however the relevant interneurons recruited by sensory stimuli and how they impact principal cells are unclear. Here we show that two major interneuron circuits govern dynamic inhibition in space and time within the olfactory cortex. Dendritic-targeting layer 1 interneurons receive strong input from the olfactory bulb and govern early-onset feedforward inhibition. However, this circuit is only transiently engaged during bursts of olfactory bulb input. In contrast, somatic-targeting layer 3 interneurons, recruited exclusively by recurrent excitation from pyramidal cells, produce late-onset feedback inhibition. Our results reveal two complementary interneuron circuits enforcing widespread inhibition, which shifts from the apical dendrites to somata of pyramidal cells during bursts of sensory input.
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