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Slice Patch Clamp Technique for Analyzing Learning-Induced Plasticity
Published on: November 11, 2017
Compartmentalized dendritic plasticity and input feature storage in neurons
Attila Losonczy1, Judit K Makara, Jeffrey C Magee
1Howard Hughes Medical Institute, Janelia Farm Research Campus, 19700 Helix Dr Ashburn, Virginia 20147, USA. losonczya@janelia.hhmi.org
Nature
|March 28, 2008
Summary
Central nervous system information storage may involve more than synaptic plasticity. Researchers discovered a new form of plasticity in rat neurons,
Area of Science:
- Neuroscience
- Cellular Neuroscience
- Synaptic Plasticity
Background:
- Information storage in the central nervous system is traditionally attributed to synaptic plasticity.
- Alternative mechanisms, such as changes in membrane excitability, are also proposed.
- Local dendritic spikes are nonlinear voltage events in dendrites, acting as feature detectors.
Purpose of the Study:
- To investigate the existence and mechanisms of local dendritic spike plasticity.
- To determine if dendritic excitability changes can store information distinct from synaptic plasticity.
Main Methods:
- Utilized rat hippocampal CA1 pyramidal neurons.
- Investigated N-methyl-d-aspartate receptor (NMDAR)-dependent regulation of Kv4.2 potassium channels.
- Examined branch-specific modifications in the coupling between dendritic spikes and the soma.
Main Results:
- Demonstrated branch-specific plasticity of local dendritic spikes in rat hippocampal neurons.
- Showed this plasticity is mediated by NMDAR-dependent regulation of Kv4.2 potassium channels.
- Identified 'branch strength potentiation' as a novel information storage mechanism.
Conclusions:
- Local dendritic spike plasticity offers a new mechanism for information storage in the brain.
- This mechanism, 'branch strength potentiation,' stores spatio-temporal correlation features of synaptic input.
- It is mechanistically distinct from traditional synaptic efficacy changes.
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