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Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
Published on: April 23, 2019
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Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
Julia K Sunstrum1, Wataru Inoue2
1Neuroscience Program, Schulich School of Medicine and Dentistry, University of Western Ontario.
Journal of Visualized Experiments : Jove
|May 14, 2019
Summary
Investigate synaptic multiplicity, the number of connections between neurons, using electrophysiology. This method differentiates between synchronous and asynchronous neurotransmitter release to quantify synaptic connections.
Area of Science:
- Neuroscience
- Cellular Neuroscience
- Synaptic Plasticity
Background:
- Neurons in the central nervous system often form multiple synaptic contacts, known as synaptic multiplicity.
- Synaptic multiplicity is a dynamic property that influences synaptic transmission efficacy and changes during development and under various physiological conditions.
Purpose of the Study:
- To outline experimental methods for quantifying the degree of synaptic multiplicity onto a postsynaptic neuron.
- To provide a technique applicable to diverse research areas investigating synaptic organization.
Main Methods:
- Utilizing whole-cell patch clamp electrophysiology in acute brain slices.
- Comparing spontaneous excitatory postsynaptic currents (sEPSCs) and miniature excitatory postsynaptic currents (mEPSCs) under voltage-clamp conditions.
- Differentiating action potential-dependent (synchronous) and action potential-independent (asynchronous) neurotransmitter release.
Main Results:
- Action potential-dependent sEPSCs are larger due to synchronous release at multiple synaptic sites.
- Action potential-independent mEPSCs are smaller, reflecting asynchronous release.
- The amplitude difference between sEPSCs and mEPSCs serves as an indicator of synaptic multiplicity.
Conclusions:
- The described electrophysiological approach allows for the characterization of synaptic multiplicity.
- This technique has the potential to reveal how in vivo interventions impact synaptic organization in different brain regions.
- Understanding synaptic multiplicity is crucial for comprehending synaptic transmission and its regulation.
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