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Related Concept Videos

Fusion of Secretory Vesicles with the Plasma Membrane01:26

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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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SNAREs and Membrane Fusion01:43

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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Synaptic Signaling01:12

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
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Related Experiment Video

Updated: Sep 15, 2025

Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
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Synaptic vesicles that store monoamines and glutamate differ in protein composition.

Hrach Asmerian, Alexia J Diaz, Hongfei Xu

    Biorxiv : the Preprint Server for Biology
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    Summary

    Dopamine and glutamate synaptic vesicles differ in protein composition, impacting their release mechanisms. Specific protein SCAMP5 loss impairs glutamate vesicle recycling but not dopamine vesicle recycling.

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    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Cell Biology

    Background:

    • Neuromodulators like monoamines signal slower than classical neurotransmitters due to G protein-coupled receptors.
    • Differences in release mechanisms between classical and modulatory transmitters are not fully understood.
    • Synaptic vesicle (SV) composition is crucial for neurotransmitter release.

    Purpose of the Study:

    • To investigate the molecular differences in synaptic vesicles (SVs) containing dopamine (via VMAT2) versus glutamate (via VGLUT2).
    • To identify mechanisms responsible for differential release kinetics of monoamines and glutamate.
    • To understand the role of SV protein diversity in regulating neurotransmitter release.

    Main Methods:

    • Utilized a CRISPR-generated knock-in mouse with an N-terminal HA tag on VMAT2 for immunoisolation of monoamine SVs.
    • Compared protein composition of VMAT2-containing SVs versus VGLUT2-containing SVs.
    • Validated findings in primary neurons and brain tissue.
    • Performed functional analysis of differentially expressed proteins, including SCAMP5.

    Main Results:

    • Significant differences were found in the abundance and isoform expression of SV protein families between dopamine and glutamate SVs.
    • These protein abundance differences were confirmed in primary neurons and brain tissue.
    • Selective impairment of VGLUT2 SV recycling, but not VMAT2 SV recycling, was observed upon loss of SCAMP5.

    Conclusions:

    • Synaptic vesicles exhibit molecular diversity, with distinct protein compositions for dopamine and glutamate.
    • Differential expression of SV proteins, such as SCAMP5, plays a role in regulating the release and recycling of specific neurotransmitter types.
    • These findings offer new insights into the mechanisms governing dopamine and glutamate release, with potential implications for behavior and neurological function.