Lateral entorhinal cortex inputs modulate hippocampal dendritic excitability by recruiting a local disinhibitory microcircuit.

Lateral entorhinal cortex inputs modulate hippocampal dendritic excitability by recruiting a local disinhibitory microcircuit.
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侧向内部皮层输入通过募集局部抑制性微电路来调节海马树突状兴奋性。

DOI:
10.1016/j.celrep.2022.111962
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发表时间:
2023-01-31
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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The lateral entorhinal cortex (LEC) provides multisensory information to the hippocampus, directly to the distal dendrites of CA1 pyramidal neurons. LEC neurons perform important functions for episodic memory processing, coding for contextually salient elements of an environment or experience. However, we know little about the functional circuit interactions between the LEC and the hippocampus. We combine functional circuit mapping and computational modeling to examine how long-range glutamatergic LEC projections modulate compartment-specific excitation-inhibition dynamics in hippocampal area CA1. We demonstrate that glutamatergic LEC inputs can drive local dendritic spikes in CA1 pyramidal neurons, aided by the recruitment of a disinhibitory VIP interneuron microcircuit. Our circuit mapping and modeling further reveal that LEC inputs also recruit CCK interneurons that may act as strong suppressors of dendritic spikes. These results highlight a cortically driven GABAergic microcircuit mechanism that gates nonlinear dendritic computations, which may support compartment-specific coding of multisensory contextual features within the hippocampus. Bilash et al. found that long-range cortical inputs can drive local dendritic spikes in hippocampal pyramidal neurons. These inputs recruit a local GABAergic microcircuit to disinhibit dendritic spikes. These findings identify circuit mechanisms where the dynamic interaction of compartment-specific excitation, inhibition, and disinhibition supports supralinear neuronal computations.
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