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Cognitive and emotional information processing: protein synthesis and gene expression
Sreedharan Sajikumar1, Sheeja Navakkode, Volker Korz
1Department for Neurophysiology, Leibniz-Institute for Neurobiology, Brenneckestrasse 6, 39118 Magdeburg, Germany.
The Journal of Physiology
|August 19, 2007
Summary
Functional plasticity, like long-term potentiation (LTP) and long-term depression (LTD), is usually compartment-restricted. However, strong stimuli and rolipram uncompartmentalize plasticity, requiring transcription for stress responses.
Area of Science:
- Neuroscience
- Cellular Biology
- Molecular Biology
Background:
- Functional plasticity, including long-term potentiation (LTP) and long-term depression (LTD), is crucial for memory formation.
- These plasticity processes are typically confined to specific dendritic compartments.
- Strong synaptic activation can override these compartment restrictions.
Purpose of the Study:
- Investigate the cellular mechanisms underlying the uncompartmentalization of synaptic plasticity.
- Explore the role of type 4 phosphodiesterase inhibition in this process.
- Determine the behavioral relevance of compartmentalized versus uncompartmentalized plasticity.
Main Methods:
- Utilized rolipram, a type 4 phosphodiesterase inhibitor.
- Examined the requirement of transcription for uncompartmentalization.
- Assessed behavioral responses in rats under different input conditions.
Main Results:
- Rolipram action leads to the uncompartmentalization of normally localized plasticity processes.
- Uncompartmentalization of plasticity requires transcriptional regulation.
- Cognitive tasks in rats align with compartmentalized plasticity, while stressful inputs trigger uncompartmentalized plasticity involving gene expression.
Conclusions:
- Cognitive processes likely depend on local protein synthesis for consolidation.
- Stressful stimuli induce immediate gene expression, leading to a neuron-wide increase in plasticity-related proteins (PRPs).
- This provides a cellular mechanism for differential neuronal responsiveness to behaviorally significant inputs.
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