Vesicle Fusion Detection
Vesicle Fusion Detection - Related Videos
01:26
Fusion of Secretory Vesicles with the Plasma Membrane
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2023
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. In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
08:13
A Cre-Lox P Recombination Approach for the Detection of Cell Fusion In Vivo
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Cited by 11 •
2012
A method to track cell fusion in living organisms over time is described. The approach utilizes Cre-LoxP recombination to induce luciferase expression upon cell fusion. The luminescent signal generated can be detected in living organisms using biophotonic imaging systems with a sensitivity of detection of ˜1,000 cells in peripheral tissues.
02:45
Nuclear Fusion
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2020
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons. A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
09:19
Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay
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2012
We have developed a cell fusion assay that quantifies SNARE-mediated membrane fusion events by activated expression of β-galactosidase.
08:36
FM Dyes in Vesicle Recycling
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2023
FM dyes are a class of fluorescent molecules that has found important use in studying the vesicle recycling process. By virtue of a chemical structure, these molecules can insert themselves into the outer leaflet of phospholipid bilayer membranes. After membrane insertion, they are internalized into the cell via endocytosed vesicles, and released when these vesicles recycle back to the membrane. Since, these dyes fluoresce strongly in the hydrophobic environment within membranes and weakly in...
FAQs
Calcium influx acts as a key regulator of synaptic vesicle fusion at the presynaptic membrane. Detecting when fusion follows stimulation helps researchers examine the relationship between calcium entry and release timing, while measurements of fusion frequency and kinetics show how strongly and how rapidly a synapse responds. These features provide functional information about neuronal communication.
Each signal reports a different observable consequence of membrane fusion. Membrane capacitance can track changes associated with vesicle membrane incorporation, fluorescence can indicate fusion-related signal changes, and electrochemical activity can reflect neurotransmitter release. Using these readouts allows investigators to examine fusion through complementary physical or chemical measurements rather than relying on a single signal.
Fusion kinetics describe the timing and progression of release-related events, whereas event frequency indicates how often fusion occurs under a given stimulus. Together, they help distinguish changes in the speed of synaptic responses from changes in release occurrence. This distinction is important when assessing how stimulation, calcium regulation, drugs, or genetic changes affect neuronal signaling.
Recording fusion during controlled synaptic stimulation connects an external signal with events at the presynaptic membrane. Researchers can compare the timing and extent of fusion-related signals across stimulation conditions, then evaluate how those changes correspond to neurotransmitter release. The resulting measurements help explain how presynaptic activity is converted into communication across the synapse.
A general workflow begins by applying a defined stimulus to the neuronal system, selecting a fusion-sensitive readout, and recording the resulting signal over time. The data can then be examined for event timing, frequency, and kinetics. This approach links the measured signal to synaptic vesicle behavior and supports comparisons between different experimental conditions.
The choice depends on which aspect of fusion or release the experiment needs to monitor. Capacitance measurements emphasize membrane changes, fluorescence provides an optical fusion-related signal, and electrochemical measurements address activity associated with neurotransmitter release. Comparing these approaches can help investigators select a readout suited to the timing, frequency, or release properties under study.
These measurements provide functional endpoints for testing whether disease-related changes, drugs, or genetic modifications alter neuronal signaling. Investigators can compare fusion timing, frequency, or kinetics between conditions and determine whether presynaptic release is affected. The approach therefore connects molecular or pharmacological changes with measurable consequences for synaptic communication.