Vesicle Release Kinetics
Vesicle Release Kinetics - Related Videos
07:29
Tracking miRNA Release into Extracellular Vesicles using Flow Cytometry
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2023
Here, we describe a straightforward protocol that enables in vitro assessment of the abundance of fluorescently labeled microRNAs to study the dynamics of microRNA packaging and export into extracellular vesicles (EVs).
06:58
Evaluation of LC3-II Release via Extracellular Vesicles in Relation to the Accumulation of Intracellular LC3-positive Vesicles
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Cited by 7 •
2024
Here, we present the methodology for concisely assessing autophagosome marker LC3-II levels in extracellular vesicles (EVs) by immunoblotting. Analysis for LC3-II levels in EVs, autolysosome formation, and omegasome formation suggests the new role of STX6 in the release of LC3-II-positive EVs when autophagosome-lysosome fusion is inhibited.
00:23
Kinetic Energy
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2019
Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall has kinetic energy. In biological systems, particles of light travel and are absorbed by plants to create chemical energy. Animals consume the chemical energy and give off molecules that carry their scent through the air. They also generate kinetic energy when they run away from predators. Entire systems also possess kinetic energy, like the...
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...
01:19
Enzyme Kinetics
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2019
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction. Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
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The decisive trigger is the local calcium increase produced when an action potential opens voltage-gated calcium channels. Calcium sensors detect this signal and activate the fusion machinery, including SNARE proteins. Because channel opening links electrical activity to sensor activation, the timing and magnitude of calcium entry can influence how quickly vesicles fuse and how strongly a secretory cell responds.
Calcium sensors translate the local calcium signal into activation of the fusion process, while SNARE proteins provide the molecular machinery that brings the vesicle and plasma membranes together. Their coordinated action determines whether fusion proceeds through a transient fusion pore or advances to complete vesicle collapse, producing different patterns of content delivery during secretion.
A transient fusion pore creates a temporary connection between the vesicle interior and the extracellular space, allowing release without immediate full merger of the vesicle membrane. Complete collapse represents a more extensive fusion outcome in which the vesicle membrane merges with the plasma membrane. Distinguishing these outcomes helps explain differences in release duration and secretory behavior.
Release latency, duration, and event frequency provide complementary views of secretion. Latency indicates how long release takes to begin, duration describes how long an event persists, and frequency reflects how often events occur. Examining these measures together helps researchers distinguish changes in response timing from changes in event occurrence, revealing how cells regulate signaling strength.
In neuronal and endocrine cells, release timing and event frequency help connect cellular activity with the strength and persistence of signaling. Measuring these properties can show how efficiently a cell converts an action potential and calcium signal into secretion. The same framework therefore supports comparisons between neurotransmitter release, hormone release, and other forms of exocytosis.
Changes in vesicle release kinetics can modify when secreted signals appear, how long they persist, and how frequently they are delivered. Those changes may alter communication between cells or the output of secretory tissues. Studying release dynamics therefore provides a way to investigate how abnormal secretion contributes to neurological and secretory disorders without relying only on the amount released.