Dynamics of epileptiform activity in mouse hippocampal slices.

Dynamics of epileptiform activity in mouse hippocampal slices.
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DOI:
10.1007/s10867-011-9216-x
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发表时间:
2011-06
影响因子:
1.8
通讯作者:
Bazhenov, Maxim
Bazhenov, Maxim
中科院分区:
生物学4区
文献类型:
--
作者:
Filatov, Gregory;Krishnan, Giri P.;Rulkov, Nikolai F.;Bazhenov, Maxim

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细胞外K +浓度的增加介导了体外类似于癫痫的同步活动,并被认为是体内某些类型癫痫发作的主要因素之一。虽然潜在的生物物理机制清楚地涉及细胞去极化和整体兴奋性的增加,它仍然是未知的时空网络动态发生什么质的变化后,细胞外K +的增加。在这项研究中,我们使用小鼠海马切片的多电极记录来探索细胞外K +浓度逐渐增加过程中网络活动的变化。我们的分析揭示了癫痫样活动的复杂时空演变,并展示了从相对简单的网络突发到复杂突发的一系列状态转换,每个突发中有多个同步事件。我们描述这些转换的状态吸引子,从实验数据构建的质的变化,介导的细胞外K +浓度的升高。
Increase of the extracellular K +  concentration mediates seizure-like synchronized activities in vitro and was proposed to be one of the main factors underlying epileptogenesis in some types of seizures in vivo. While underlying biophysical mechanisms clearly involve cell depolarization and overall increase in excitability, it remains unknown what qualitative changes of the spatio-temporal network dynamics occur after extracellular K +  increase. In this study, we used multi-electrode recordings from mouse hippocampal slices to explore changes of the network activity during progressive increase of the extracellular K +  concentration. Our analysis revealed complex spatio-temporal evolution of epileptiform activity and demonstrated a sequence of state transitions from relatively simple network bursts into complex bursting, with multiple synchronized events within each burst. We describe these transitions as qualitative changes of the state attractors, constructed from experimental data, mediated by elevation of extracellular K +  concentration.
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