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Rac1 Constrains Memory Consolidation
Gabriel Fernandes Borges1, Beatriz do Nascimento Pinheiro Moura1, Thays Alves Monteiro1
1Edmond and Lily Safra International Institute of Neuroscience, Santos Dumont Institute, Macaiba, RN 59280-000, Brazil.
Eneuro
|March 24, 2026
Summary
Inhibition of Rac1 (Ras-related C3 botulinum toxin substrate 1) after learning enhances long-term memory consolidation in rats. This suggests Rac1 acts as a brake on memory stabilization, offering potential therapeutic benefits for cognitive function.
Area of Science:
- Neuroscience
- Molecular Biology
- Cognitive Science
Background:
- Ras-related C3 botulinum toxin substrate 1 (Rac1) is a small GTPase involved in actin dynamics and synaptic plasticity.
- Rac1's role in memory consolidation, distinct from its known involvement in active forgetting, remains largely unexplored.
Purpose of the Study:
- To investigate whether Rac1 activity constrains the consolidation of new memories.
- To determine if inhibiting Rac1 after learning can enhance memory persistence.
Main Methods:
- Systemic administration of the Rac1 inhibitor 1A-116 post-training in rats using the novel object recognition task.
- Assessment of memory persistence, locomotor activity, and anxiety-related behaviors.
- Evaluation of long-term memory formation from sub-threshold training, including hippocampal protein synthesis requirements.
Main Results:
- Post-training Rac1 inhibition with 1A-116 significantly extended recognition memory persistence for at least 28 days.
- 1A-116 enabled long-term memory formation from weak training, dependent on hippocampal protein synthesis.
- Inhibition did not affect locomotor or anxiety behaviors, indicating specificity.
Conclusions:
- Rac1 acts as a negative regulator of memory consolidation, functioning as a molecular brake on memory stabilization.
- Inhibiting Rac1 after learning can enhance cognitive durability and promote long-term memory formation.
- Targeting Rac1 may offer a therapeutic strategy to improve memory persistence in various conditions.
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