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Updated: Jun 20, 2026
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Live-imaging of PKC Translocation in Sf9 Cells and in Aplysia Sensory Neurons
Published on: April 6, 2011
PKC differentially translocates during spaced and massed training in Aplysia
Carole A Farah1, Daniel Weatherill, Tyler W Dunn
1Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.
Summary
Training patterns significantly impact learning and memory. Spaced training downregulates PKC Apl II via PKA signaling, while massed training causes persistent PKC translocation, revealing molecular differences in memory formation.
Area of Science:
- Neuroscience
- Molecular Biology
- Behavioral Science
Background:
- Learning and memory are influenced by training patterns.
- Aplysia is a model organism for studying learning at cellular and molecular levels.
- Serotonin (5HT) activates protein kinase C (PKC) Apl II, a key step in memory formation.
Purpose of the Study:
- To investigate how training patterns affect serotonin (5HT)-mediated PKC Apl II activation.
- To elucidate the molecular mechanisms differentiating spaced and massed training in memory consolidation.
Main Methods:
- Examined the pattern-dependent activation of PKC Apl II in Aplysia.
- Investigated the roles of protein kinase A (PKA) signaling and protein synthesis in PKC translocation.
Main Results:
- PKC Apl II activation is sensitive to the pattern of 5HT application.
- Spaced training downregulates PKC translocation via PKA signaling.
- Massed training leads to persistent PKC translocation, mediated by protein synthesis.
Conclusions:
- Differential regulation of PKC translocation underlies distinct memory forms from spaced vs. massed training.
- Competing feedback mechanisms involving protein synthesis are crucial for memory consolidation.
