Cited by 270Memory and Neural MechanismsNeurotransmitter Receptor Influence on BehaviorMemory Processes and Influences

Dopamine and Memory: Modulation of the Persistence of Memory for Novel Hippocampal NMDA Receptor-Dependent Paired Associates

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Bethus, Ingrid, Tse, Dorothy, Morris, Richard G. M.·2010·The Journal of Neuroscience

Abstract

Three experiments investigated the role in memory processing of dopamine (DA) afferents to the hippocampus (HPC) that arise from the ventral tegmental area. One hypothesis is that D 1 /D 5 receptor activation in HPC is necessary for the encoding of novel, episodic-like information; the other is that DA activation ensures the greater temporal persistence of transient hippocampal memory traces. Rats ( n = 35) were trained, in separate experiments using an episodic-like memory task, to learn six paired associates (PAs) in an “event arena” involving a repeated association between specific flavors of food and locations in space. After 6 weeks of training, rats had learned a “schema” such that two new paired associates could be acquired in a single trial in one session (episodic-like memory). We show that encoding of novel PAs is sensitive to intrahippocampal microinfusion of the NMDA antagonist d -AP-5. Experiment 1 established that intrahippocampal infusion of the D 1 /D 5 dopaminergic antagonist SCH23390 [ R (+)-7-chloro-8-hydroxy-3-methyl-1-phenyl-2,3,4,5-tetrahydro-1 H -3-benzazepine hydrochloride] before encoding of new PAs caused impaired memory 24 h later but that SCH23390 had no effect on the later memory of previously established PAs. Experiment 2 established that SCH23390 modulated the persistence of new memories over time (30 min vs 24 h) rather than affecting initial encoding. Experiment 3 revealed that the impact of SCH23390 was not mediated by state dependence nor had an effect on memory retrieval. These findings support the second hypothesis and establish that persistent, long-term memory of rapid, hippocampal-mediated acquisition of new paired associates requires activation of D 1 /D 5 receptors in HPC at or around the time of encoding.

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  • Blockade of D1/D5 dopaminergic receptors during spatial learning impairs memory persistence.

    “Blockade of D1/D5 dopaminergic receptors during spatial learning impairs memory persistence7”
  • Pharmacological studies have implicated the neurotransmitter dopamine in the stability of hippocampus-dependent memory.

    “Pharmacological studies have implicated the neurotransmitter dopamine in the stability of hippocampus-dependent memory.”
  • Hippocampal dopaminergic activity influences long-term but not short-term memory retention in appetitive tasks.

    “hippocampal dopaminergic activity was shown to influence long-term but not short-term memory retention in appetitive tasks (Bethus et al., 2010).”
  • This one-trial memory for novel associations is critically dependent on the hippocampus and on glutamatergic neurotransmission during encoding.

    “This one-trial memory for novel associations is critically dependent on the hippocampus and on glutamatergic neurotransmission during encoding [25, 26].”
  • Intrahippocampal infusion of the D1/D5 dopaminergic antagonist SCH23390 just before encoding causes impaired memory for the new reward-location association measured 24 hours later, but has no effect on early memory measured at 30 minutes.

    “Intrahippocampal infusion of the D1/D5 dopaminergic antagonist SCH23390 just before encoding causes impaired memory for the new reward-location association measured 24 hours later, but has no effect on early memory measured at 30 minutes [26]”

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Authors
Bethus, I., Tse, D., & Morris, R. G. M.
Affiliations
University of Edinburgh (GB)
Corresponding author
Bethus, Ingrid
Venue
The Journal of Neuroscience
Published
2010-02-03
Volume
30
Issue
5
Pages
1610-1618
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2168456060
Cited by
270
References
57
Citations by year
2026: 6 · 2025: 14 · 2024: 12 · 2023: 8 · 2022: 19 · 2021: 17 · 2020: 12 · 2019: 13 · 2018: 17 · 2017: 22 · 2016: 26 · 2015: 25 · 2014: 16 · 2013: 18 · 2012: 21
FWCI
12.03
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Edge Hill University Research Information Repository (Edge Hill University) (submittedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
Funders
Medical Research Council
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
Keywords
dopamine, hippocampus, paired associates, episodic-like memory, memory persistence, NMDA receptor antagonism, SCH 23390, ventral tegmental area, memory encoding, state dependence, memory retrieval
MeSH terms
Analysis of Variance, Animals, Benzazepines, Cues, Dopamine, Hippocampus, Male, Memory, Memory, Short-Term, Reaction Time, Retention, Psychology, Receptors, N-Methyl-D-Aspartate, Receptors, Dopamine D1, Rats

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