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首页> 外文期刊>Neuron >A Transient Translaminar GABAergic Interneuron Circuit Connects Thalamocortical Recipient Layers in Neonatal Somatosensory Cortex
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A Transient Translaminar GABAergic Interneuron Circuit Connects Thalamocortical Recipient Layers in Neonatal Somatosensory Cortex

机译:瞬态跨层GABA能中神经元电路连接新生儿体感皮层中的丘脑皮质受体层。

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摘要

GABAergic activity is thought to influence developing neocortical sensory circuits. Yet the late postnatal maturation of local layer (L)4 circuits suggests alternate sources of GABAergic control in nascent thalamocortical networks. We show that a population of L5b, somatostatin (SST)-positive interneuron receives early thalamic synaptic input and, using laser-scanning photostimulation, identify an early transient circuit between these cells and L4 spiny stellates (SSNs) that disappears by the end of the L4 critical period. Sensory perturbation disrupts the transition to a local GABAergic circuit, suggesting a link between translaminar and local control of SSNs. Conditional silencing of SST+ interneurons or conversely biasing the circuit toward local inhibition by overexpression of neuregulin-1 type 1 results in an absence of early L5b GABAergic input in mutants and delayed thalamic innervation of SSNs. These data identify a role for L5b SST+ interneurons in the control of SSNs in the early postnatal neocortex.
机译:GABA能活动被认为会影响新皮层感觉回路的发展。然而,产后局部层(L)4回路的后期成熟表明新生的丘脑皮质网络中存在GABA能控制的替代来源。我们显示L5b,生长抑素(SST)阳性中枢神经元的人群收到早期丘脑突触输入,并使用激光扫描光刺激,确定这些细胞与L4棘状星状(SSNs)之间的早期瞬态电路,该电路在末尾消失。 L4关键期。感觉扰动破坏了向局部GABA能回路的过渡,表明跨层和SSN的局部控制之间存在联系。 SST +中间神经元的条件沉默或通过过度表达1型神经调节蛋白使电路反向偏向局部抑制,导致突变体中没有早期的L5b GABA能输入,并且延迟了SSN的丘脑神经支配。这些数据确定了L5b SST +中间神经元在产后早期新皮层中控制SSN的作用。

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