Neocortical somatostatin-expressing GABAergic interneurons disinhibit the thalamorecipient layer 4.
Neocortical somatostatin-expressing GABAergic interneurons disinhibit the thalamorecipient layer 4.
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DOI:
10.1016/j.neuron.2012.11.004
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发表时间:
2013-01-09
期刊:
影响因子:
16.2
通讯作者:
Rudy B
中科院分区:
文献类型:
--
作者:
Xu H;Jeong HY;Tremblay R;Rudy B
Subtypes of GABAergic interneurons (INs) are crucial for cortical function, yet their specific roles are largely unknown. In contrast to supra- and infra-granular layers, where most somatostatin-expressing (SOM) INs are layer 1-targeting Martinotti cells, the axons of SOM INs in layer 4 somatosensory cortex largely remain within layer 4. Moreover, we found that whereas layers 2/3 SOM INs target mainly pyramidal cells (PCs), layer 4 SOM INs target mainly fast-spiking (FS) INs. Accordingly, optogenetic inhibition of SOM INs in an active cortical network increases the firing of layers 2/3 PCs whereas decreases the firing of layer 4 principal neurons (PNs). This unexpected effect of SOM INs on layer 4 PNs occurs via their inhibition of local FS INs. These results reveal a novel disinhibitory microcircuit in the thalamorecipient layer through interactions among subtypes of GABAergic INs, and suggest that SOM IN-mediated disinhibition represents an important circuit mechanism for cortical processing.
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通讯作者:
Kawaguchi, Y