Enhanced excitability of the hippocampal CA2 region and its contribution to seizure activity in a mouse model of temporal lobe epilepsy.

Enhanced excitability of the hippocampal CA2 region and its contribution to seizure activity in a mouse model of temporal lobe epilepsy.
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DOI:
10.1016/j.neuron.2022.07.020
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发表时间:
2022-10-05
期刊:
影响因子:
16.2
通讯作者:
Scharfman, Helen E.
Scharfman, Helen E.
中科院分区:
医学1区
文献类型:
--
作者:
Whitebirch, Alexander C.;LaFrancois, John J.;Jain, Swati;Leary, Paige;Santoro, Bina;Siegelbaum, Steven A.;Scharfman, Helen E.

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海马 CA2 区域是一个对社会记忆很重要的区域,人们怀疑它在颞叶癫痫 (TLE) 中发挥着重要作用,因为在人类和啮齿动物 TLE 模型中观察到邻近的 CA1 和 CA3 区域具有抗变性能力。然而,对于 CA2 特性的改变是否会促进癫痫发作的发生或传播,人们知之甚少。在这里,我们使用毛果芸香碱诱导的 TLE 癫痫持续状态模型探讨了 CA2 的作用。急性海马切片的离体电生理记录揭示了一系列协调变化,这些变化增强了 CA2 PC 内在兴奋性,减少了 CA2 抑制输入,并增加了 CA2 对其主要 CA1 突触靶点的兴奋性输出。此外,CA2 锥体细胞的选择性化学遗传学沉默导致自发性癫痫发作的频率显着降低。这些发现提供了第一个证据,表明 CA2 积极促进 TLE 癫痫发作活动,因此可能是一个有前途的治疗靶点。怀特伯奇等人。发现癫痫小鼠海马切片中 CA2 PC 的内在兴奋性和净突触兴奋性增加。体内 CA2 PC 的化学遗传学抑制可降低自发复发性癫痫发作的频率。这些数据共同表明 CA2 回路的病理性过度兴奋可能导致癫痫发作。
The hippocampal CA2 region, an area important for social memory, has been suspected to play a role in temporal lobe epilepsy (TLE) because of its resistance to degeneration observed in neighboring CA1 and CA3 regions in both humans and rodent models of TLE. However, little is known about whether alterations in CA2 properties promote seizure generation or propagation. Here we addressed the role of CA2 using the pilocarpine-induced status epilepticus model of TLE. Ex vivo electrophysiological recordings from acute hippocampal slices revealed a set of coordinated changes that enhance CA2 PC intrinsic excitability, reduce CA2 inhibitory input, and increase CA2 excitatory output to its major CA1 synaptic target. Moreover, selective chemogenetic silencing of CA2 pyramidal cells caused a significant decrease in the frequency of spontaneous seizures. These findings provide the first evidence that CA2 actively contributes to TLE seizure activity and may thus be a promising therapeutic target. Whitebirch et al. find increased intrinsic excitability and net synaptic excitation of CA2 PCs in hippocampal slices from epileptic mice. Chemogenetic inhibition of CA2 PCs in vivo reduces the frequency of spontaneous recurring seizures. Together these data suggest pathological hyperexcitability in CA2 circuitry may contribute to seizure activity in epilepsy.
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