Hub GABA neurons mediate gamma-frequency oscillations at ictal-like event onset in the immature hippocampus.

Hub GABA neurons mediate gamma-frequency oscillations at ictal-like event onset in the immature hippocampus.
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DOI:
10.1016/j.neuron.2012.01.026
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发表时间:
2012-04-12
期刊:
影响因子:
16.2
通讯作者:
Bernard C
Bernard C
中科院分区:
医学1区
文献类型:
--
作者:
Quilichini PP;Le Van Quyen M;Ivanov A;Turner DA;Carabalona A;Gozlan H;Esclapez M;Bernard C

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伽马频率振荡(GFO,> 40 Hz)是所有发育阶段癫痫发作时的一般网络特征,在未成熟的大脑中可能产生有害后果。在早期发育阶段,不同大脑区域同时出现GFO表明癫痫发作时存在长期同步机制。在这里,我们表明,海马隔(HS)神经元,这是GABA的长程投射神经元,是必要的夹带海马中间神经元进入瞬态高频发射癫痫样放电的发病在完整的,不成熟的隔海马结构。中间神经元的同步放电反过来又产生GFO,GFO在消除少量HS神经元后被消除。由于它们提供了必要的快速管道起搏大型神经元群体和显示海马内和海马外的远程投影,HS神经元似乎属于一类枢纽细胞,发挥了至关重要的作用,在同步发展网络。
Gamma-frequency oscillations (GFOs, > 40 Hz) are a general network signature at seizure onset at all stages of development, with possible deleterious consequences in the immature brain. At early developmental stages, the simultaneous occurrence of GFOs in different brain regions suggests the existence of a long-ranging synchronizing mechanism at seizure onset. Here, we show that hippocampo-septal (HS) neurons, which are GABA long-range projection neurons, are necessary to entrain hippocampal interneurons into transient high frequency firing at the onset of epileptiform discharges in the intact, immature septo-hippocampal formation. The synchronized firing of interneurons in turn produces GFOs, which are abolished after the elimination of a small number of HS neurons. Since they provide the necessary fast conduit for pacing large neuronal populations and display intra- and extrahippocampal long-range projections, HS neurons appear to belong to the class of hub cells, which play a crucial role in the synchronization of developing networks.
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