Cited by 75Memory and Neural MechanismsPosttraumatic Stress Disorder ResearchNeuroscience and Neuropharmacology Research

Inhibition of projections from the basolateral amygdala to the entorhinal cortex disrupts the acquisition of contextual fear

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Sparta, Dennis R., Smithuis, Jim, Stamatakis, Alice M., Jennings, Joshua H., Kantak, Pranish A., Ung, Randall L., Stuber, Garret D.·2014·Frontiers in Behavioral Neuroscience

Abstract

The development of excessive fear and/or stress responses to environmental cues such as contexts associated with a traumatic event is a hallmark of post-traumatic stress disorder (PTSD). The basolateral amygdala (BLA) has been implicated as a key structure mediating contextual fear conditioning. In addition, the hippocampus has an integral role in the encoding and processing of contexts associated with strong, salient stimuli such as fear. Given that both the BLA and hippocampus play an important role in the regulation of contextual fear conditioning, examining the functional connectivity between these two structures may elucidate a role for this pathway in the development of PTSD. Here, we used optogenetic strategies to demonstrate that the BLA sends a strong glutamatergic projection to the hippocampal formation through the entorhinal cortex (EC). Next, we photoinhibited glutamatergic fibers from the BLA terminating in the EC during the acquisition or expression of contextual fear conditioning. In mice that received optical inhibition of the BLA-to-EC pathway during the acquisition session, we observed a significant decrease in freezing behavior in a context re-exposure session. In contrast, we observed no differences in freezing behavior in mice that were only photoinhibited during the context re-exposure session. These data demonstrate an important role for the BLA-to-EC glutamatergic pathway in the acquisition of contextual fear conditioning.

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Crossref · 10.3389/fnbeh.2014.00129

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  • BLA projections to the hippocampal formation through the entorhinal cortex are necessary for the acquisition of contextual fear memories, as photoinhibition of these terminals during learning blocks freezing during context reexposure.

    “for example, BLA projections to the hippocampal formation through the entorhinal cortex are necessary for the acquisition of contextual fear memories, as photoinhibition of these terminals during learning blocks freezing during context reexposure90.”

    From Resolving the neural circuits of anxiety (2015) · cites this paper as [90]

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Authors
Sparta, D. R., Smithuis, J., Stamatakis, A. M., Jennings, J. H., Kantak, P. A., Ung, R. L., & Stuber, G. D.
Affiliations
University of North Carolina at Chapel Hill (US)
Corresponding author
Stuber, Garret D.
Venue
Frontiers in Behavioral Neuroscience
Published
2014-05-06
Volume
8
Pages
129-129
ISSN
1662-5153 (ISSN-L)
OpenAlex
W2118979149
Cited by
75
References
49
Citations by year
2026: 4 · 2024: 1 · 2023: 4 · 2022: 6 · 2021: 11 · 2020: 4 · 2019: 8 · 2018: 5 · 2017: 7 · 2016: 9 · 2015: 11 · 2014: 5
FWCI
5.95
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Behavioral Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UNC Libraries
Funders
  • Whitehall Foundation
  • National Alliance for Research on Schizophrenia and Depression
  • Foundation of Hope for Research and Treatment of Mental Illness
  • National Institute on Alcohol Abuse and Alcoholism (P50AA011605, AA011605, AA021417, AA 007573, R00AA021417, AA022234, K99AA021417, R01AA022234, P60AA011605, T32AA007573)
  • National Institute on Drug Abuse (F31DA034472, R01DA032750, DA029325, R21DA029325, DA032750)
  • National Institute of Neurological Disorders and Stroke (P30NS045892)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (U54HD079124)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Social Sciences › Psychology › Clinical Psychology › Posttraumatic Stress Disorder Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
basolateral amygdala, entorhinal cortex, contextual fear conditioning, glutamatergic projections, hippocampus, post-traumatic stress disorder, fear acquisition, photoinhibition, optogenetics, freezing behavior

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