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
中科院分区:
文献类型:
--
作者:
Zolnik TA;Ledderose J;Toumazou M;Trimbuch T;Oram T;Rosenmund C;Eickholt BJ;Sachdev RNS;Larkum ME
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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