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:
影响因子:
--
通讯作者:
Müller WS
中科院分区:
文献类型:
--
作者:
Bragin DE;Sanderson JL;Peterson S;Connor JA;Müller WS
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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DOI:
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发表时间:
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期刊:
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