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Synapse-specific homeostatic mechanisms in the hippocampus
1Department of Neuroscience, Brown University, Box G-LN, Sidney E. Frank Hall for Life Science, 185 Meeting Street, Providence, RI 02912, USA. katherine_deeg@brown.edu
Journal of Neurophysiology
|December 17, 2008
Summary
Neural circuits maintain stability through homeostatic synaptic plasticity. A new study reveals synapse-specific plasticity that balances strengthening and weakening, preventing harmful network activity like epileptic seizures.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Computational Neuroscience
Background:
- Neural circuits require homeostatic synaptic plasticity to maintain stability amidst input fluctuations.
- Previously, chronic silencing of neuronal inputs was known to globally increase excitatory synaptic strength.
Purpose of the Study:
- To describe a novel form of synapse-specific homeostatic plasticity.
- To investigate how this plasticity impacts hippocampal network stability and prevents aberrant activity.
Main Methods:
- Investigated homeostatic plasticity in hippocampal networks using electrophysiological recordings.
- Analyzed changes in excitatory synaptic strength following chronic input silencing.
Main Results:
- Discovered synapse-specific homeostatic plasticity where input silencing simultaneously strengthens some excitatory synapses and weakens others.
- Observed that these opposing adaptations maintain overall synaptic gain within the hippocampal network.
- Demonstrated that this plasticity limits reverberatory bursting, a network activity associated with epilepsy.
Conclusions:
- This synapse-specific homeostatic plasticity represents a new mechanism for maintaining neural circuit stability.
- The balancing of synaptic strengthening and weakening prevents harmful network hyperexcitability and may offer insights into epilepsy treatment.
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