Layer 6b Is Driven by Intracortical Long-Range Projection Neurons.

Layer 6b Is Driven by Intracortical Long-Range Projection Neurons.
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第 6b 层由皮质内长程投射神经元驱动

DOI:
10.1016/j.celrep.2020.02.044
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发表时间:
2020
期刊:
影响因子:
8.8
通讯作者:
Larkum ME
Larkum ME
中科院分区:
生物学1区
文献类型:
--
作者:
Zolnik TA;Ledderose J;Toumazou M;Trimbuch T;Oram T;Rosenmund C;Eickholt BJ;Sachdev RNS;Larkum ME

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第 6b 层 (L6b) 是最深的新皮质层,投射到皮质目标和高阶丘脑,是唯一对促进唤醒的神经肽食欲素/下丘脑分泌素有反应的层。这些特征表明 L6b 可以强烈调节大脑状态,但对 L6b 的预测及其影响仍然未知。在这里,我们通过基于狂犬病的逆行追踪和视紫红质通道在脑切片中辅助电路映射来检查小鼠初级体感皮层中 L6bex 体内的输入。我们发现 L6b 从皮质内远程投射神经元(包括对侧半球的神经元)接收最强的兴奋性输入。相比之下,局部皮质内输入和丘脑皮质输入明显较弱。此外,我们的数据表明 L6b 接收的丘脑皮质输入比其他皮质层少得多。 L6b 受 PV 和 SST 中间神经元的抑制最为强烈。这项研究表明,L6b 整合了远程皮质内信息,并且不是传统丘脑皮质环路的一部分。
Layer 6b (L6b), the deepest neocortical layer, projects to cortical targets and higher-order thalamus and is the only layer responsive to the wake-promoting neuropeptide orexin/hypocretin. These characteristics suggest that L6b can strongly modulate brain state, but projections to L6b and their influence remain unknown. Here, we examine the inputs to L6bex vivoin the mouse primary somatosensory cortex with rabies-based retrograde tracing and channelrhodopsin-assisted circuit mapping in brain slices. We find that L6b receives its strongest excitatory input from intracortical long-range projection neurons, including those in the contralateral hemisphere. In contrast, local intracortical input and thalamocortical input were significantly weaker. Moreover, our data suggest that L6b receives far less thalamocortical input than other cortical layers. L6b was most strongly inhibited by PV and SST interneurons. This study shows that L6b integrates long-range intracortical information and is not part of the traditional thalamocortical loop.
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