Synaptic Vesicle Exocytosis
Synaptic Vesicle Exocytosis - Related Videos
08:46
Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
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Cited by 18 •
2010
FM dyes have been of invaluable help in the understanding of synaptic dynamics. FMs are normally followed under the fluorescent microscope during different stimulation conditions. However, photoconversion of FM dyes combined with electron microscopy allows the visualization of distinct synaptic vesicle pools, among other ultrastructure components, in synaptic boutons.
02:42
Analyzing Synaptic Vesicle Recycling and Fluorescent Dye Uptake in Drosophila Larvae
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2025
This video demonstrates a protocol to study synaptic vesicle recycling at neuromuscular junctions in channelrhodopsin-expressing Drosophila larvae using a fluorescent dye. Blue light activates the channelrhodopsins, causing calcium influx and synaptic vesicle exocytosis. The dye integrates into the neuronal membranes and is internalized during endocytosis, resulting in enhanced fluorescence. Further blue light stimulation induces exocytosis and dye release, which is shown by reduced...
09:02
Quantitative Analysis of Synaptic Vesicle Pool Replenishment in Cultured Cerebellar Granule Neurons using FM Dyes
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Cited by 11 •
2011
A live fluorescence imaging technique to quantify the replenishment and mobilisation of specific synaptic vesicle (SV) pools in central nerve terminals is described. Two rounds of SV recycling are monitored in the same nerve terminals providing an internal control.
05:41
Transmission Electron Microscopic Imaging of Synaptic Vesicle Endocytosis in Mouse Hippocampal Neurons
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2025
Source: Villarreal, S., et. al., Measuring Synaptic Vesicle Endocytosis in Cultured Hippocampal Neurons. J. Vis. Exp. (2017)This video demonstrates the analysis of synaptic vesicle endocytosis in cultured hippocampal neurons through horseradish peroxidase labeling and electron microscopy.
09:27
An Introduction to Endocytosis and Exocytosis
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2023
Cells can take in substances from the extracellular environment by endocytosis and actively release molecules into it by exocytosis. Such processes involve lipid membrane-bound sacs called vesicles. Knowledge of the molecular architecture and mechanisms of both is key to understanding normal cell physiology, as well as the disease states that arise when they become defective. This video will first briefly review a few pivotal discoveries in the history of endo- and exocytosis research. Next,...
FAQs
Calcium entry links electrical activity to vesicle fusion. An arriving action potential opens voltage-gated calcium channels in the nerve terminal, allowing calcium to enter. This local rise activates synaptotagmin, which then promotes the membrane-fusion process. Because calcium influx follows the action potential, it provides the signal that couples presynaptic excitation to neurotransmitter release.
Synaptotagmin and SNARE proteins contribute at different points in the same release event. Calcium activates synaptotagmin, while SNARE-protein-mediated fusion joins the synaptic-vesicle membrane with the plasma membrane. Their coordinated action explains how a presynaptic calcium signal is converted into membrane merger, allowing stored neurotransmitter to leave the nerve terminal and reach the synaptic cleft.
The process forms a functional bridge between presynaptic electrical activity and postsynaptic response. After vesicle fusion, neurotransmitters enter the synaptic cleft and bind receptors on the postsynaptic cell. Those receptor interactions shape neural signaling, so studying release helps connect events at the nerve terminal with the behavior of the receiving cell.
A study can follow the process as a linked sequence: an action potential reaches the nerve terminal, voltage-gated calcium channels open, calcium activates synaptotagmin, and SNARE proteins promote vesicle fusion. Researchers can then consider neurotransmitter entry into the synaptic cleft and receptor binding on the postsynaptic cell to relate release to signaling outcomes.
Release at the nerve terminal determines how neurotransmitters become available to influence the next cell. Examining this step helps explain synaptic transmission, the communication process between neurons, and synaptic plasticity, through which neural signaling can be shaped. It therefore provides a mechanistic focus for understanding broader nervous-system function.
Because synaptic vesicle exocytosis controls the entry of neurotransmitters into communication between neurons, changes in the process can be examined in relation to neurological disorders. The same framework supports research on drugs that alter neuronal communication. Investigators can use the release pathway to connect presynaptic molecular events with changes in neural signaling.