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A thalamic-hippocampal CA1 signal for contextual fear memory suppression, extinction, and discrimination

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Ratigan, Heather C., Krishnan, Seetha, Smith, Shai, Sheffield, Mark E. J.·2023·Nature Communications

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Abstract

The adaptive regulation of fear memories is a crucial neural function that prevents inappropriate fear expression. Fear memories can be acquired through contextual fear conditioning (CFC) which relies on the hippocampus. The thalamic nucleus reuniens (NR) is necessary to extinguish contextual fear and innervates hippocampal CA1. However, the role of the NR-CA1 pathway in contextual fear is unknown. We developed a head-restrained virtual reality CFC paradigm, and demonstrate that mice can acquire and extinguish context-dependent fear responses. We found that inhibiting the NR-CA1 pathway following CFC lengthens the duration of fearful freezing epochs, increases fear generalization, and delays fear extinction. Using in vivo imaging, we recorded NR-axons innervating CA1 and found that NR-axons become tuned to fearful freezing following CFC. We conclude that the NR-CA1 pathway actively suppresses fear by disrupting contextual fear memory retrieval in CA1 during fearful freezing behavior, a process that also reduces fear generalization and accelerates extinction.

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  1. [56]Dolleman-Van Der Weel MJ Witter MP Projections from the nucleus reuniens thalami to the entorhinal cortex, hippocampal field CA1, and the subiculum in the rat arise from different populations of neurons J. Comp. Neurol. 1996 364 637 650 8821451
  2. [71]Andrianova, L. et al. Hippocampal CA1 pyramidal cells do not receive monosynaptic input from thalamic nucleus reuniens. bioRxiv10.1101/2021.09.30.462517 (2021).
  3. [84]Heather C. et al. Code from: a thalamic-hippocampal CA1 signal for contextual fear memory suppression, extinction, and discrimination. NR Analysis at 10.5281/zenodo.8393380 (2023). PMC10598272 37875465 · DOI

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Authors
Ratigan, H. C., Krishnan, S., Smith, S., & Sheffield, M. E. J.
Affiliations
University of Chicago (US)
Corresponding author
Sheffield, Mark E. J.
Venue
Nature Communications
Published
2023-10-24
Volume
14
Issue
1
Pages
6758-6758
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4387903600
Cited by
60
References
92
Citations by year
2026: 12 · 2025: 28 · 2024: 17 · 2023: 3
FWCI
8.99
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by)
  • Knowledge@UChicago (University of Chicago) (submittedVersion, cc-by-nc-nd)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • University of Chicago (cc-by)
Funders
  • U.S. Department of Health & Human Services | NIH | National Institute of Neurological Disorders and Stroke (1DP2NS111657-01)
  • Whitehall Foundation
  • U.S. Department of Health & Human Services | NIH | National Institute on Drug Abuse (T32DA043469)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
Keywords
nucleus reuniens, hippocampal CA1, contextual fear conditioning, fear extinction, fear generalization, fear memory retrieval, fear discrimination, mice

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