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投射至背侧海马体和前扣带回的内侧隔区神经元对类情景记忆的回忆有不同贡献。

Dorsal hippocampus- and ACC-projecting medial septum neurons differentially contribute to the recollection of episodic-like memory.

作者信息

Jin Tao, Chen Ruyan, Shao Mingshuo, Yang Xiao, Ma Lan, Wang Feifei

机构信息

State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, School of Basic Medical Sciences, Institutes of Brain Science, Fudan University, Shanghai, China.

出版信息

FASEB J. 2020 Sep;34(9):11741-11753. doi: 10.1096/fj.202000398R. Epub 2020 Jul 11.

Abstract

Episodic memory refers to the recollection of previous experiences containing specific temporal, spatial, and emotional information. The ability to recollect episodic memory requires coordination of multiple brain regions, including the hippocampus (HPC) and the cingulate cortex. While the afferents into HPC and cingulate cortex that orchestrate the episodic memory remain unclear. The medial septum (MS), one of the anatomical location of cholinergic centers, innervates not only the dorsal HPC (dHPC), but also the cingulate and entorhinal cortices. By using "What-Where-When" episodic-like memory (ELM) behavioral model and viral tracing, we found that MS neurons projected to dHPC and anterior cingulate cortex (ACC), which exerted distinct impacts on ELM recollection. Chemogenetic inhibition of the dHPC-projecting MS neurons disrupted "What-Where-When" ELM recollection as well as object location, object-in-place, and recency recognition memories recollection, while chemogenetic inhibition of the ACC-projecting MS neurons only disrupted "What-Where-When" ELM recollection. Moreover, neither dHPC- nor ACC-projecting MS neurons were involved in novel object recognition memory recollection or locomotor activity. Immunostaining showed that ACC- and dHPC-projecting MS neurons are partially overlapped populations. These findings reveal an unsuspected division of ELM processing and provide the potential mechanism that the recollection of episodic memory need the coordination of MS neurons projecting to dHPC and ACC.

摘要

情景记忆是指对包含特定时间、空间和情感信息的先前经历的回忆。回忆情景记忆的能力需要多个脑区的协调,包括海马体(HPC)和扣带回皮层。然而,协调情景记忆的传入到HPC和扣带回皮层的神经通路仍不清楚。内侧隔区(MS)是胆碱能中枢的解剖位置之一,不仅支配背侧海马体(dHPC),还支配扣带回和内嗅皮层。通过使用“什么-哪里-何时”类情景记忆(ELM)行为模型和病毒示踪,我们发现投射到dHPC和前扣带回皮层(ACC)的MS神经元对ELM回忆产生了不同的影响。对投射到dHPC的MS神经元进行化学遗传学抑制会破坏“什么-哪里-何时”ELM回忆以及物体位置、物体在位和新近度识别记忆的回忆,而对投射到ACC的MS神经元进行化学遗传学抑制只会破坏“什么-哪里-何时”ELM回忆。此外,投射到dHPC和ACC的MS神经元均不参与新物体识别记忆的回忆或运动活动。免疫染色显示,投射到ACC和dHPC的MS神经元是部分重叠的群体。这些发现揭示了ELM处理中一个未被怀疑的分工,并提供了情景记忆回忆需要投射到dHPC和ACC的MS神经元协调的潜在机制。

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