Progression of activity and structural changes in the anterior cingulate cortex during remote memory formation
Massimiliano Aceti1, Gisella Vetere2, Giovanni Novembre3
1Istituto di Biologia Cellulare e Neurobiologia, Consiglio Nazionale delle Ricerche, Rome, Italy; Neuroscience Department, The Scripps Research Institute, Jupiter 33458, FL, USA.
Neurobiology of Learning and Memory
|May 24, 2015
Summary
Neural activity in the anterior cingulate cortex increases before structural changes occur during remote fear memory formation. This suggests a sequence of events in brain plasticity for memory consolidation.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Cellular Neuroscience
Background:
- Contextual fear memory involves complex neural circuits.
- The anterior cingulate cortex plays a crucial role in fear memory.
- Understanding the temporal dynamics of neural changes is key to memory research.
Purpose of the Study:
- To investigate the temporal sequence of neural activity and structural changes in the anterior cingulate cortex during remote contextual fear memory.
- To correlate these changes with memory recall.
Main Methods:
- Imaging c-fos expression and dendritic spine density in mice.
- Administering retrieval tests at multiple time points post-training (days 1, 5, 7, 14, 21, 36).
- Analyzing freezing behavior as a measure of fear memory.
Main Results:
- Conditioned mice showed consistent freezing behavior across all time points.
- C-fos expression increased significantly from day 5 onwards, correlating with freezing scores.
- Dendritic spine density increased significantly by day 7 and stabilized by day 14.
- Spine density distribution became more homogeneous over time.
Conclusions:
- Neural activity (c-fos expression) precedes structural remodeling (dendritic spine changes) in the anterior cingulate cortex.
- Structural remodeling, including increased spine density and homogeneity, follows initial activity increases.
- These findings elucidate the temporal sequence of neural plasticity in remote fear memory consolidation.
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