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On the role of hippocampal protein synthesis in the consolidation and reconsolidation of object recognition memory

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Rossato, Janine I., Bevilaqua, Lia R.M., Myskiw, Jociane C., Medina, Jorge H., Izquierdo, Iván, Cammarota, Martín·2007·Learning & Memory

Abstract

Upon retrieval, consolidated memories are again rendered vulnerable to the action of metabolic blockers, notably protein synthesis inhibitors. This has led to the hypothesis that memories are reconsolidated at the time of retrieval, and that this depends on protein synthesis. Ample evidence indicates that the hippocampus plays a key role both in the consolidation and reconsolidation of different memories. Despite this fact, at present there are no studies about the consequences of hippocampal protein synthesis inhibition in the storage and post-retrieval persistence of object recognition memory. Here we report that infusion of the protein synthesis inhibitor anisomycin in the dorsal CA1 region immediately or 180 min but not 360 min after training impairs consolidation of long-term object recognition memory without affecting short-term memory, exploratory behavior, anxiety state, or hippocampal functionality. When given into CA1 after memory reactivation in the presence of familiar objects, ANI did not affect further retention. However, when administered into CA1 immediately after exposing animals to a novel and a familiar object, ANI impaired memory of both of them. The amnesic effect of ANI was long-lasting, did not happen after exposure to two novel objects, following exploration of the context alone, or in the absence of specific stimuli, suggesting that it was not reversible but was contingent on the reactivation of the consolidated trace in the presence of a salient, behaviorally relevant novel cue. Our results indicate that hippocampal protein synthesis is required during a limited post-training time window for consolidation of object recognition memory and show that the hippocampus is engaged during reconsolidation of this type of memory, maybe accruing new information into the original trace.

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Crossref · 10.1101/lm.422607

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Authors
Rossato, J. I., Bevilaqua, L. R. M., Myskiw, J. C., Medina, J. H., Izquierdo, I., & Cammarota, M.
Affiliations
Universidad de Buenos Aires (AR)
Venue
Learning & Memory
Published
2007-01
Volume
14
Issue
1-2
Pages
36-46
ISSN
  • 1072-0502 (ISSN-L)
  • 1549-5485
OpenAlex
W2137288204
Cited by
282
References
85
Citations by year
2026: 8 · 2025: 8 · 2024: 12 · 2023: 10 · 2022: 14 · 2021: 10 · 2020: 18 · 2019: 12 · 2018: 23 · 2017: 17 · 2016: 12 · 2015: 17 · 2014: 16 · 2013: 19 · 2012: 13
Type
posted content
Language
en
Open access
Locations
  • Learning & Memory (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico
  • Agencia Nacional de Promoción Científica y Tecnológica
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
Keywords
memory consolidation, memory reconsolidation, object recognition memory, anisomycin, protein synthesis inhibitors, dorsal CA1, memory reactivation, novel object recognition, long-term memory

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