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Updated: Nov 23, 2025
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An Optical Assay for Synaptic Vesicle Recycling in Cultured Neurons Overexpressing Presynaptic Proteins
Published on: June 26, 2018
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Neurotransmitter Release Site Replenishment and Presynaptic Plasticity
1Department of Physiology, Tokyo Medical University, Tokyo 160-8402, Japan.
International Journal of Molecular Sciences
|January 5, 2021
Summary
Action potentials trigger neurotransmitter release and replenish synaptic vesicles (SVs) at active zones (AZs). Millisecond calcium (Ca2+) dynamics and protein cascades precisely control SV replenishment, enabling short-term synaptic plasticity.
Area of Science:
- Neuroscience
- Cell Biology
- Biophysics
Background:
- Synaptic transmission relies on action potentials (APs) triggering neurotransmitter release from synaptic vesicles (SVs) at the active zone (AZ).
- AP-driven SV replenishment ensures sustained synaptic function, but its timescale has been debated.
- Calcium (Ca2+) influx through voltage-gated channels regulates these processes.
Purpose of the Study:
- To review the mechanisms controlling synaptic vesicle replenishment at the active zone.
- To highlight the role of millisecond calcium dynamics in synaptic vesicle dynamics.
- To explain how these mechanisms contribute to short-term synaptic plasticity.
Main Methods:
- Literature review of recent high-speed resolution studies on synaptic vesicle dynamics.
- Analysis of protein cascades activated by calcium influx.
- Integration of findings on active zone function and presynaptic short-term plasticity.
Main Results:
- Synaptic vesicle dynamics occur on a millisecond timescale following an action potential.
- Calcium (Ca2+) dynamics activate multiple protein cascades.
- These cascades precisely regulate the replenishment of release-ready SVs at the active zone.
Conclusions:
- Millisecond calcium dynamics are crucial for rapid synaptic vesicle replenishment.
- Protein cascades activated by calcium mediate the control of release site replenishment.
- This rapid replenishment mechanism underlies presynaptic short-term plasticity.
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