气候变化领域集成服务门户(CCPortal): Crucial role for CA2 inputs in the sequential organization of CA1 time cells supporting memory

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DOI	10.1073/pnas.2020698118
	Crucial role for CA2 inputs in the sequential organization of CA1 time cells supporting memory
	MacDonald C.J.; Tonegawa S.
发表日期	2021
ISSN	00278424
卷号	118 期号:3
英文摘要	There is considerable evidence for hippocampal time cells that briefly activate in succession to represent the temporal structure of memories. Previous studies have shown that time cells can be disrupted while leaving place cells intact, indicating that spatial and temporal information can be coded in parallel. However, the circuits in which spatial and temporal information are coded have not been clearly identified. Here we investigated temporal and spatial coding by dorsal hippocampal CA1 (dCA1) neurons in mice trained on a classic spatial working-memory task. On each trial, the mice approached the same choice point on a maze but were trained to alternate between traversing one of two distinct spatial routes (spatial coding phase). In between trials, there was a 10-s mnemonic delay during which the mouse continuously ran in a fixed location (temporal coding phase). Using cell-type–specific optogenetic methods, we found that inhibiting dorsal CA2 (dCA2) inputs into dCA1 degraded time cell coding during the mnemonic delay and impaired the mouse’s subsequent memory-guided choice. Conversely, inhibiting dCA2 inputs during the spatial coding phase had a negligible effect on place cell activity in dCA1 and no effect on behavior. Collectively, our work demonstrates that spatial and temporal coding in dCA1 is largely segregated with respect to the dCA2–dCA1 circuit and suggests that CA2 plays a critical role in representing the flow of time in memory within the hippocampal network. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Hippocampus \| time cells \| place cells \| memory \| CA2
语种	英语
scopus关键词	animal cell; animal experiment; article; hippocampal CA1 region; hippocampal CA2 region; human; male; mouse; nerve cell; nonhuman; place cell; working memory
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180998
作者单位	RIKEN–MIT Laboratory for Neural Circuit Genetics, Picower Institute for Learning and Memory, Department of Biology, Massachusetts Institute ofTechnology, Cambridge, MA 02139, United States; Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; HHMI, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
推荐引用方式 GB/T 7714	MacDonald C.J.,Tonegawa S.. Crucial role for CA2 inputs in the sequential organization of CA1 time cells supporting memory[J],2021,118(3).
APA	MacDonald C.J.,&Tonegawa S..(2021).Crucial role for CA2 inputs in the sequential organization of CA1 time cells supporting memory.Proceedings of the National Academy of Sciences of the United States of America,118(3).
MLA	MacDonald C.J.,et al."Crucial role for CA2 inputs in the sequential organization of CA1 time cells supporting memory".Proceedings of the National Academy of Sciences of the United States of America 118.3(2021).