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首页> 外文期刊>Neuron >Epileptogenic actions of GABA and fast oscillations in the developing hippocampus.
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Epileptogenic actions of GABA and fast oscillations in the developing hippocampus.

机译:GABA的致痫作用和发育中的海马体的快速振荡。

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摘要

GABA excites immature neurons and inhibits adult ones, but whether this contributes to seizures in the developing brain is not known. We now report that in the developing, but not the adult, hippocampus, seizures beget seizures only if GABAergic synapses are functional. In the immature hippocampus, seizures generated with functional GABAergic synapses include fast oscillations that are required to transform a naive network to an epileptic one: blocking GABA receptors prevents the long-lasting sequels of seizures. In contrast, in adult neurons, full blockade of GABA(A) receptors generates epileptogenic high-frequency seizures. Therefore, purely glutamatergic seizures are not epileptogenic in the developing hippocampus. We suggest that the density of glutamatergic synapses is not sufficient for epileptogenesis in immature neurons; excitatory GABAergic synapses are required for that purpose. We suggest that the synergistic actions of GABA and NMDA receptors trigger the cascades involved in epileptogenesis in the developing hippocampus.
机译:GABA会激发未成熟的神经元并抑制成年的神经元,但尚不清楚这是否有助于发育中的大脑癫痫发作。我们现在报告,在发育中的海马而非成人海马中,只有在GABA能突触起作用的情况下才会发作癫痫。在未成熟的海马体中,由功能性GABA能突触产生的癫痫发作包括快速振荡,这种振荡需要将幼稚的网络转变为癫痫网络:阻断GABA受体可防止长期的癫痫发作的后遗症。相反,在成年神经元中,对GABA(A)受体的完全阻断会产生致癫痫性高频癫痫发作。因此,在发展中的海马中,纯粹的谷氨酸能性癫痫发作不是致癫痫的。我们认为,谷氨酸能突触的密度不足以使未成熟神经元发生癫痫。为此目的,需要兴奋性GABA能突触。我们建议,GABA和NMDA受体的协同作用触发在发展中的海马中参与癫痫发生的级联反应。

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