Inhibition of inhibition in visual cortex: the logic of connections between molecularly distinct interneurons.

Inhibition of inhibition in visual cortex: the logic of connections between molecularly distinct interneurons.
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DOI:
10.1038/nn.3446
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发表时间:
2013-08
影响因子:
25
通讯作者:
Scanziani, Massimo
Scanziani, Massimo
中科院分区:
医学1区
文献类型:
--
作者:
Pfeffer, Carsten K.;Xue, Mingshan;He, Miao;Huang, Z. Josh;Scanziani, Massimo

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皮质抑制性神经元相互联系,形成抑制性突触连接网络。然而,我们对这个抑制网络背后的连接模式的了解仍然不完整。在这里,我们发现了小鼠视皮层中三个大分子不同的中间神经元群体之间简单而互补的相互作用方案:表达小白蛋白的中间神经元相互强烈抑制,但令人惊讶的是,对其他群体几乎没有抑制作用。相反,表达生长抑素的中间神经元避免相互抑制,但强烈地抑制所有其他群体。最后,表达血管活性肠肽的中间神经元优先抑制生长抑素中间神经元。这种机制出现在颗粒上和颗粒下的层,这表明抑制网络在视觉皮质的输入和输出上运行类似。因此,由于兴奋性神经元之间的连接的特异性形成了皮质规范回路的基础,这里描述的方案概述了皮质抑制神经元之间的标准连接模式。
Cortical inhibitory neurons contact each other to form a network of inhibitory synaptic connections. Our knowledge of the connectivity pattern underlying this inhibitory network is, however, still incomplete. Here we discover a simple and complementary interaction scheme between three large molecularly distinct interneuron populations in mouse visual cortex: Parvalbumin expressing interneurons strongly inhibit one another but, surprisingly, provide little inhibition to other populations. In contrast, somatostatin expressing interneurons avoid inhibiting one another, yet strongly inhibit all other populations. Finally, vasoactive intestinal peptide expressing interneurons preferentially inhibit somatostatin interneurons. This scheme occurs in supra- and infra-granular layers, suggesting that inhibitory networks operate similarly at the input and output of visual cortex. Thus, as the specificity of connections between excitatory neurons forms the basis for the cortical canonical circuit, the scheme described here outlines a standard connectivity pattern among cortical inhibitory neurons.
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