Temporal disparity of action potentials triggered in axon initial segments and distal axons in the neocortex.

Temporal disparity of action potentials triggered in axon initial segments and distal axons in the neocortex.
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DOI:
10.1126/sciadv.ade4511
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发表时间:
2023-10-13
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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神经群活动决定了突触输入的时间,突触输入到达皮质神经元的树突、细胞体和轴突初始段 (AIS)。 AIS (AIS-AP) 中的动作电位启动由输入积分驱动,并且网络振荡期间 AIS-AP 的相位偏好是细胞类别的特征。皮质轴突的远端区域不接收突触输入,但实验诱导方案可以触发远离体细胞的轴突的轴后动作电位(RA-AP)。我们报告了人类和啮齿类动物皮质中间神经元中自发发生的 RA-AP,其似乎与输入和群体活动不相关。 AIS-AP 的网络连接触发与相同中间神经元的 RA-AP 的输入独立时序相比,导致单个细胞通过体周和远端轴突放电对体内网络操作的不同时间贡献。新皮质 GABA 能细胞在向上状态期间在体周轴突中启动放电,在向下状态期间在远端轴突中启动放电。
Neural population activity determines the timing of synaptic inputs, which arrive to dendrites, cell bodies, and axon initial segments (AISs) of cortical neurons. Action potential initiation in the AIS (AIS-APs) is driven by input integration, and the phase preference of AIS-APs during network oscillations is characteristic to cell classes. Distal regions of cortical axons do not receive synaptic inputs, yet experimental induction protocols can trigger retroaxonal action potentials (RA-APs) in axons distal from the soma. We report spontaneously occurring RA-APs in human and rodent cortical interneurons that appear uncorrelated to inputs and population activity. Network-linked triggering of AIS-APs versus input-independent timing of RA-APs of the same interneurons results in disparate temporal contribution of a single cell to in vivo network operation through perisomatic and distal axonal firing. Neocortical GABAergic cells initiate firing in the perisomatic axon during up states and in the distal axon during down states.
细胞外田地和电流的起源-EEG,ECOG,LFP和尖峰。
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