Development of epileptiform excitability in the deep entorhinal cortex after status epilepticus.

Development of epileptiform excitability in the deep entorhinal cortex after status epilepticus.
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DOI:
10.1111/j.1460-9568.2009.06863.x
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发表时间:
2009-08
期刊:
The European journal of neuroscience
影响因子:
--
通讯作者:
Müller WS
Müller WS
中科院分区:
其他
文献类型:
--
作者:
Bragin DE;Sanderson JL;Peterson S;Connor JA;Müller WS

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在许多大脑区域都观察到癫痫发作期间的癫痫样神经元活动,但其在癫痫持续状态 (SE) 后的起源尚不清楚。我们使用 Li-低剂量毛果芸香碱大鼠颞叶癫痫 (TLE) 模型来检查深部内嗅皮层 (EC) 癫痫样活动的早期发展。我们发现,在 SE 之后的 3 周潜伏期内,EC 第 5 层中越来越多的神经元对单一突触刺激做出多突触爆发去极化反应。这种变化与第 5 层神经元中 IPSP 反转电位的渐进性去极化转变相平行,这显然是由 Cl- 内向转运蛋白 NKCC1 的上调和 Cl- 向外转运蛋白 KCC2 的同时下调引起的,这两种变化都有利于细胞内 Cl- 的积累。在潜伏期抑制 Cl- 摄取可恢复更多负 GABA 能逆转电位并消除多突触爆发。 Cl-转运蛋白的变化对于深部内嗅皮层具有高度特异性。在此期间,它们没有出现在第 1-3 层、鼻周皮层、下托或齿状回。我们认为,Cl-稳态的变化促进了深部内嗅皮层的过度兴奋,导致那里的癫痫样放电,随后影响下游皮层区域。
Epileptiform neuronal activity during seizures is observed in many brain areas, but its origins following status epilepticus (SE) are unclear. We have used the Li-low dose pilocarpine rat model of temporal lobe epilepsy (TLE) to examine early development of epileptiform activity in the deep entorhinal cortex (EC). We show that during the 3 week latent period that follows SE, an increasing percentage of neurons in EC layer 5 respond to a single synaptic stimulus with polysynaptic burst depolarizations. This change is paralleled by a progressive depolarizing shift of the IPSP reversal potential in layer 5 neurons, apparently caused by upregulation of the Cl- inward transporter NKCC1 and concurrent downregulation of the Cl- outward transporter KCC2, both changes favoring intracellular Cl- accumulation. Inhibiting Cl- uptake in the latent period restored more negative GABAergic reversal potentials and eliminated polysynaptic bursts. The changes in the Cl- transporters were highly specific to the deep entorhinal cortex. They did not occur in layers 1-3, perirhinal cortex, subiculum or dentate gyrus during this period. We propose that the changes in Cl- homeostasis facilitate hyperexcitability in the deep entorhinal cortex leading to epileptiform discharge there, which subsequently affects downstream cortical regions.
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