Cited by 276Memory and Neural MechanismsNeuroscience and Neuropharmacology ResearchStress Responses and Cortisol

Exposing Rats to a Predator Blocks Primed Burst Potentiation in the Hippocampus In Vitro

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Mesches, Michael H., Fleshner, Monika, Heman, Karen L., Rose, Gregory M., Diamond, David M.·1999·The Journal of Neuroscience

Abstract

This study evaluated the effects of acute psychological stress (cat exposure) in adult male rats on electrophysiological plasticity subsequently assessed in the hippocampus in vitro. Two physiological models of memory were studied in CA1 in each recording session: (1) primed burst potentiation (PBP), a low-threshold form of plasticity produced by a total of five physiologically patterned pulses; and (2) long-term potentiation (LTP), a suprathreshold form of plasticity produced by a train of 100 pulses. Three groups of rats were studied: (1) undisturbed rats in their home cage (home cage); (2) rats placed in a chamber for 75 min (chamber); and (3) rats placed in a chamber for 75 min in close proximity to a cat (chamber/stress). At the end of the chamber exposure period, blood samples were obtained, and the hippocampus was prepared for in vitro recordings. Only the chamber/stress group had elevated (stress) levels of corticosterone. The major finding was that PBP, but not LTP, was blocked in the chamber/stress group. Thus, the psychological stress experienced by the rats in response to cat exposure resulted in an inhibition of plasticity, which was localized to the intrinsic circuitry of the hippocampus. This work provides novel observations on the effects of an ethologically relevant stressor on PBP in vitro and of the relative insensitivity of LTP to being modulated by psychological stress. We discuss the relevance of these electrophysiological findings to our behavioral work showing that predator stress impairs spatial memory.

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Crossref · 10.1523/jneurosci.19-14-j0004.1999

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Research works printed but not linked: 2

  1. Diamond DM, Park CR, Heman K L, Rose GM (1999b) Exposure to a predator impairs spatial working memory in the radial arm water maze. Hippocampus, in press.
  2. Mesches M H, Rose GM, Fleshner M, Heman K L, Diamond DM (1998) E xposing rats to a predator blocks hippocampal primed burst potenti- ation in vitro. Proceedings of the 27th Annual Meeting of the Society for Neuroscience, pp 1420 -1420. Washington, DC: Society for Neuroscience.

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Authors
Mesches, M. H., Fleshner, M., Heman, K. L., Rose, G. M., & Diamond, D. M.
Affiliations
  • University of Colorado Health (US)
  • University of Colorado Boulder (US)
  • United States Department of Veterans Affairs (US)
Venue
The Journal of Neuroscience
Published
1999-07-15
Volume
19
Issue
14
Pages
RC18-RC18
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1599181452
Cited by
276
References
48
Citations by year
2026: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 9 · 2020: 1 · 2019: 3 · 2018: 5 · 2017: 7 · 2016: 10 · 2015: 1 · 2014: 5 · 2013: 7 · 2012: 5
FWCI
10.93
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Commons - University of South Florida (University of South Florida) (submittedVersion)
Funders
Office of Naval Research (N00014)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
predator stress, cat exposure, long-term potentiation, hippocampal plasticity, CA1, corticosterone, acute psychological stress, spatial memory
MeSH terms
Action Potentials, Animals, Cats, Corticosterone, Fear, Hippocampus, Male, Memory, Stress, Psychological, Rats, Sprague-Dawley, Long-Term Potentiation, Rats

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