Task-specific enhancement of short-term, but not long-term, memory by class I metabotropic glutamate receptor antagonist 1-aminoindan-1,5-dicarboxylic acid in rats

G R J Christoffersen, L H Christensen, N R Harrington, E M Macphail, G Riedel

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Pharmacological application of broad agonists and antagonists has supported the notion of a potential role of metabotropic glutamate receptors (mGluRs) in learning and memory formation, but the specific function of the different classes or individual subtypes remains elusive. Furthermore, our knowledge with respect to different learning mechanisms is still fragmentary. In an attempt to clarify further the function of mGluRs in learning, rats were trained in various paradigms in the presence/absence of the specific class I antagonist 1-aminoindan-1,5-dicarboxylic acid (AIDA). Intraperitoneal application of AIDA prior to training led to enhanced within-session performance in animals trained in a positively reinforced reference memory task in a three-choice maze. However, this enhancement did not result in increased retention as measured by the number of correct responses during the first four trials of each session on subsequent days. The increase was purely an enhancement in within-session performance, required doses higher than 2 mg/kg, and was not accompanied by an unspecific increase in activity as monitored in the open field. By contrast, AIDA animals trained in a combined shock-reinforced contextual and cue conditioning paradigm demonstrated a pronounced retention deficit compared with controls in conditioning to the context, but not the cue (a high-frequency tone). Although within-session performance during context and cue periods was slightly increased in the AIDA group, the difference did not reach significance. Drug-induced hyperactivity, which could account for the memory deficit, was excluded by recordings of activity in specific activity cages. These results shed new light on the possible function of class I mGluRs in learning and memory formation and imply that systemic blockade of class I mGluRs may enhance short-term memory under certain learning conditions. (C) 1999 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)215-226
Number of pages12
JournalBehavioural Brain Research
Volume101
Publication statusPublished - 1999

Keywords

  • metabotropic glutamate receptors
  • class I antagonist
  • 1-aminoindan-1,5-dicarboxylic acid
  • spatial learning
  • contextual conditioning
  • rats
  • DENTATE GYRUS
  • INHIBITORY AVOIDANCE
  • POTENTIATION
  • HIPPOCAMPUS
  • AGONIST
  • MGLUR1
  • MICE
  • FEAR
  • MAINTENANCE
  • AMYGDALA

Cite this

Task-specific enhancement of short-term, but not long-term, memory by class I metabotropic glutamate receptor antagonist 1-aminoindan-1,5-dicarboxylic acid in rats. / Christoffersen, G R J ; Christensen, L H ; Harrington, N R ; Macphail, E M ; Riedel, G .

In: Behavioural Brain Research, Vol. 101, 1999, p. 215-226.

Research output: Contribution to journalArticle

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AU - Christensen, L H

AU - Harrington, N R

AU - Macphail, E M

AU - Riedel, G

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N2 - Pharmacological application of broad agonists and antagonists has supported the notion of a potential role of metabotropic glutamate receptors (mGluRs) in learning and memory formation, but the specific function of the different classes or individual subtypes remains elusive. Furthermore, our knowledge with respect to different learning mechanisms is still fragmentary. In an attempt to clarify further the function of mGluRs in learning, rats were trained in various paradigms in the presence/absence of the specific class I antagonist 1-aminoindan-1,5-dicarboxylic acid (AIDA). Intraperitoneal application of AIDA prior to training led to enhanced within-session performance in animals trained in a positively reinforced reference memory task in a three-choice maze. However, this enhancement did not result in increased retention as measured by the number of correct responses during the first four trials of each session on subsequent days. The increase was purely an enhancement in within-session performance, required doses higher than 2 mg/kg, and was not accompanied by an unspecific increase in activity as monitored in the open field. By contrast, AIDA animals trained in a combined shock-reinforced contextual and cue conditioning paradigm demonstrated a pronounced retention deficit compared with controls in conditioning to the context, but not the cue (a high-frequency tone). Although within-session performance during context and cue periods was slightly increased in the AIDA group, the difference did not reach significance. Drug-induced hyperactivity, which could account for the memory deficit, was excluded by recordings of activity in specific activity cages. These results shed new light on the possible function of class I mGluRs in learning and memory formation and imply that systemic blockade of class I mGluRs may enhance short-term memory under certain learning conditions. (C) 1999 Elsevier Science B.V. All rights reserved.

AB - Pharmacological application of broad agonists and antagonists has supported the notion of a potential role of metabotropic glutamate receptors (mGluRs) in learning and memory formation, but the specific function of the different classes or individual subtypes remains elusive. Furthermore, our knowledge with respect to different learning mechanisms is still fragmentary. In an attempt to clarify further the function of mGluRs in learning, rats were trained in various paradigms in the presence/absence of the specific class I antagonist 1-aminoindan-1,5-dicarboxylic acid (AIDA). Intraperitoneal application of AIDA prior to training led to enhanced within-session performance in animals trained in a positively reinforced reference memory task in a three-choice maze. However, this enhancement did not result in increased retention as measured by the number of correct responses during the first four trials of each session on subsequent days. The increase was purely an enhancement in within-session performance, required doses higher than 2 mg/kg, and was not accompanied by an unspecific increase in activity as monitored in the open field. By contrast, AIDA animals trained in a combined shock-reinforced contextual and cue conditioning paradigm demonstrated a pronounced retention deficit compared with controls in conditioning to the context, but not the cue (a high-frequency tone). Although within-session performance during context and cue periods was slightly increased in the AIDA group, the difference did not reach significance. Drug-induced hyperactivity, which could account for the memory deficit, was excluded by recordings of activity in specific activity cages. These results shed new light on the possible function of class I mGluRs in learning and memory formation and imply that systemic blockade of class I mGluRs may enhance short-term memory under certain learning conditions. (C) 1999 Elsevier Science B.V. All rights reserved.

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KW - MICE

KW - FEAR

KW - MAINTENANCE

KW - AMYGDALA

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EP - 226

JO - Behavioural Brain Research

JF - Behavioural Brain Research

SN - 0166-4328

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