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Published on: February 18, 2013
A molecular switch for translational control in taste memory consolidation
K Belelovsky1, A Elkobi, H Kaphzan
1Center for Brain and Behaviour, Department of Neurobiology and Ethology, Faculty of Sciences, University of Haifa, Haifa 30905, Israel.
The European Journal of Neuroscience
|November 26, 2005
Summary
Protein synthesis is crucial for memory consolidation. This study reveals that regulating protein synthesis, specifically by altering elongation and initiation rates, plays a key role in taste memory formation in rats.
Area of Science:
- Neuroscience
- Molecular Biology
- Cognitive Science
Background:
- Memory consolidation across species relies on protein synthesis.
- The specific role of protein synthesis modulation and regulated proteins in consolidation remains unclear.
Purpose of the Study:
- To investigate the role of protein synthesis modulation in taste memory consolidation.
- To identify proteins regulated translationally during this process.
Main Methods:
- Measuring eukaryotic elongation factor-2 (eEF2) phosphorylation in rat cortex.
- Assessing extracellularly regulated kinase 2 (ERK2) activation and S6K1 phosphorylation.
- Analyzing alpha-calcium/calmodulin-dependent protein kinase II (alphaCaMKII) expression in synaptoneurosomes.
Main Results:
- eEF2 phosphorylation, an indicator of translational elongation attenuation, correlates with taste memory consolidation.
- The temporal pattern of eEF2 phosphorylation mirrors ERK2 and S6K1 activation, suggesting translation initiation stimulation.
- Increased eEF2 phosphorylation and alphaCaMKII expression occur in the taste cortex post-consolidation.
Conclusions:
- Memory consolidation involves a shift in the rate-limiting step of protein synthesis.
- This shift is achieved by increased translation initiation and decreased elongation rates.
- This coordinated regulation produces a localized, switch-like effect on neuronal protein expression crucial for memory.
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