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Synaptic Variability Introduces State-Dependent Modulation of Excitatory Spinal Cord Synapses
1Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, UK.
Neural Plasticity
|July 15, 2015
Summary
Synaptic variability influences neuronal plasticity. Initial synaptic properties create state-dependent effects impacting synaptic plasticity, crucial for understanding neural function.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Neuronal Variability
Background:
- Neuronal and synaptic variability are poorly understood.
- Cellular plasticity, synaptic plasticity, and neuromodulation exhibit variability.
- This variability may stem from state-dependent effects due to initial cellular/synaptic properties or plasticity mechanisms.
Purpose of the Study:
- To investigate state-dependent influences on synaptic plasticity.
- Focus on connections between excitatory interneurons (EIN) and motor neurons in the lamprey spinal cord.
- Correlate initial synaptic properties with substance P-mediated plasticity and metaplasticity.
Main Methods:
- Examined state-dependent effects by correlating initial synaptic properties with plasticity.
- Assessed substance P-mediated plasticity of low-frequency evoked EPSPs.
- Analyzed reduction of EPSP depression over spike trains (metaplasticity).
Main Results:
- Low-frequency EPSP potentiation involved an interaction between NMDA response potentiation and release probability.
- Release probability exerted a state-dependent subtractive influence on postsynaptic NMDA-dependent potentiation.
- Metaplasticity was state-dependent, more pronounced with smaller vesicle pools and high release probabilities.
- Reduced release probability in high Mg2+ Ringer significantly decreased metaplasticity incidence.
Conclusions:
- Initial synaptic properties introduce state-dependent influences on synaptic plasticity.
- These intrinsic properties modulate the capacity for plasticity.
- Understanding these state-dependent conditions is vital for comprehending subsequent neural changes.
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