Dopaminergic D1 receptor signalling is necessary, but not sufficient for cued fear memory destabilisation
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Abstract
RATIONALE: Pharmacological targeting of memory reconsolidation is a promising therapeutic strategy for the treatment of fear memory-related disorders. However, the success of reconsolidation-based approaches depends upon the effective destabilisation of the fear memory by memory reactivation. OBJECTIVES: Here, we aimed to determine the functional involvement of dopamine D1 receptors in cued fear memory destabilisation, using systemic drug administration. RESULTS: We observed that direct D1 receptor agonism was not sufficient to stimulate tone fear memory destabilisation to facilitate reconsolidation disruption by the glucocorticoid receptor antagonist mifepristone. Instead, administration of the nootropic nefiracetam did facilitate mifepristone-induced amnesia, in a manner that was dependent upon dopamine D1 receptor activation. Finally, while the combined treatment with nefiracetam and mifepristone did not confer fear-reducing effects under conditions of extinction learning, there was some evidence that mifepristone reduces fear expression irrespective of memory reactivation parameters. CONCLUSIONS: The use of combination pharmacological treatment to stimulate memory destabilisation and impair reconsolidation has potential therapeutic benefits, without risking a maladaptive increase of fear.
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Dopamine is required for the destabilisation of both appetitive and aversive memories.
“it also appears that dopamine is required for the destabilisation of both appetitive (Merlo et al., 2015) and aversive memories (Flavell and Lee, 2019).”
From Retrieval-Dependent Mechanisms Affecting Emotional Memory Persistence: Reconsolidation, Extinction, and the Space in Between (2020) · cites this paper as Flavell and Lee, 2019
The Discussion reports that D1 receptor activation was necessary for cued fear memory destabilisation under the study’s experimental conditions: blocking D1 receptors prevented nefiracetam’s facilitative effect. This supports the aversive-memory portion attributed to Flavell and Lee, but the claim extends that finding beyond cued fear memories. The appetitive-memory portion is attributed to Merlo et al., not to this source. (LLM, conf=0.85)
Experimental — accuracy not yet measuredDopaminergic signalling does not appear to be sufficient to induce memory destabilisation, as enhancing dopaminergic signalling with the D1 dopamine receptor agonist SKF38393 did not induce destabilisation of a strong fear memory under reactivation conditions that would normally destabilise a weaker memory.
“However, dopaminergic signalling does not appear to be sufficient to induce memory destabilisation, as enhancing dopaminergic signalling with the D1 dopamine receptor agonist SKF38393 did not induce destabilisation of a strong fear memory under reactivation conditions that would normally destabilise a weaker memory (Flavell and Lee, 2019).”
From Retrieval-Dependent Mechanisms Affecting Emotional Memory Persistence: Reconsolidation, Extinction, and the Space in Between (2020) · cites this paper as Flavell and Lee, 2019
Administration of nefiracetam, a pharmacological agent that enhances LVGCC calcium currents, enhances the destabilisation of fear memory.
“Additionally, the administration of nefiracetam, a pharmacological agent that enhances LVGCC calcium currents (Yoshii and Watabe, 1994), was shown to enhance the destabilisation of fear memory (Flavell and Lee, 2019).”
From Retrieval-Dependent Mechanisms Affecting Emotional Memory Persistence: Reconsolidation, Extinction, and the Space in Between (2020) · cites this paper as Flavell and Lee, 2019
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- Authors
- Flavell, C. R., & Lee, J. L. C.
- Affiliations
- University of Birmingham (GB)
- Corresponding author
- Lee, Jonathan L. C.
- ORCID
- Lee, Jonathan L. C.
- Venue
- Psychopharmacology
- Published
- 2019-08-07
- Volume
- 236
- Issue
- 12
- Pages
- 3667-3676
- ISSN
- 0033-3158 (ISSN-L)
- 1432-2072
- PMC
- PMC6892761
- OpenAlex
- W2964501849
- Cited by
- 21
- References
- 70
- Citations by year
- 2026: 4 · 2025: 3 · 2024: 3 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 6
- FWCI
- 1.45
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Psychopharmacology (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Aston Publications Explorer (Aston University) (submittedVersion)
- University of Birmingham Research Portal (University of Birmingham) (submittedVersion, cc-by)
- Funders
- Leverhulme Trust (RPG-2015-006)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Keywords
- dopamine D1 receptor, fear memory reconsolidation, memory reactivation, mifepristone, glucocorticoid receptor, nefiracetam, nootropic drugs, fear extinction, fear expression, combination pharmacotherapy
- MeSH terms
- Animals, Cues, Extinction, Psychological, Fear, Hormone Antagonists, Male, Memory, Memory Disorders, Signal Transduction, Mifepristone, Receptors, Dopamine D1, Nootropic Agents, Rats
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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