Reversible inactivation of the entorhinal cortex disrupts the establishment and expression of latent inhibition of cued fear conditioning in C57BL/6 mice
Abstract
For latent inhibition, preexposure to a conditioned stimulus (CS) prior to training with an unconditioned stimulus (US) results in decreased conditioned responses (CRs) to the CS at the time of testing. The mechanism by which decreased CRs occurs, however, is unknown; CS preexposure may interfere with subsequent conditioning, or modulate the expression of CRs. Previous research has suggested that the entorhinal cortex (EC) is necessary for latent inhibition of a variety of tasks. However, no studies have specifically compared the role of the EC in acquisition vs. expression of latent inhibition. The present study used reversible inactivation of the EC to address this issue. The GABA agonist muscimol (0.5 μg/side) was directly infused into the EC of mice prior to CS preexposure, training, or testing. Our results indicate that muscimol inactivation of the EC before CS preexposure disrupts latent inhibition of cued fear conditioning. Importantly, this same dose of muscimol did not disrupt cued fear conditioning, nor did it affect latent inhibition when infused into the subiculum. Furthermore, inactivation of the EC at testing disrupted the expression of latent inhibition of cued fear conditioning; that is, CS preexposed mice that received entorhinal cortical muscimol infusion at testing showed CRs compared to saline‐infused CS preexposed mice. These findings suggest that repeated preexposure to the CS during latent inhibition may alter entorhinal cortical activity thereby allowing the EC to exert inhibitory control over the expression of CRs during testing of CS preexposed mice. © 2007 Wiley‐Liss, Inc.
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Direct infusions into the ventral hippocampus have very good anatomical precision, with spread of infusion using this procedure about 1 mm3 after 24-48 h.
“Direct infusions, as opposed to i.c.v. or systemic infusions, have very good anatomical precision, as the spread of infusion using this procedure is B1 mm3 after 24–48 h (Davis et al, 2007; Lewis and Gould, 2007).”
From Divergent Functional Effects of Sazetidine-A and Varenicline During Nicotine Withdrawal (2013) · cites this paper as Lewis and Gould, 2007
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- Authors
- Lewis, M. C., & Gould, T. J.
- Affiliations
- Temple University (US)
- Corresponding author
- Gould, Thomas J.
- ORCID
- Gould, Thomas J.
- Venue
- Hippocampus
- Publisher
- Wiley
- Published
- 2007-03-19
- Volume
- 17
- Issue
- 6
- Pages
- 462-470
- ISSN
- 1050-9631 (ISSN-L)
- 1098-1063
- OpenAlex
- W2123774285
- Cited by
- 42
- References
- 46
- Citations by year
- 2026: 1 · 2022: 3 · 2019: 1 · 2018: 2 · 2017: 1 · 2014: 2 · 2013: 6 · 2012: 3
- FWCI
- 3.34
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Hippocampus (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute on Drug Abuse (DA017949, R01DA017949)
- 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
- entorhinal cortex, latent inhibition, cued fear conditioning, muscimol inactivation, subiculum, inhibitory control, hippocampal formation
- MeSH terms
- Analysis of Variance, Animals, Behavior, Animal, Conditioning, Classical, Cues, Fear, Inhibition, Psychological, Male, Mice, Inbred C57BL, Muscimol, Time Factors, Entorhinal Cortex, GABA Agonists, Mice
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