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Related Concept Videos

Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

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...
Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

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.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
Exocytosis00:50

Exocytosis

Exocytosis is a process that releases molecules outside the cell. Like other bulk transport mechanisms, exocytosis requires energy.
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
Synaptic Signaling01:12

Synaptic Signaling

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.
Synaptic Signaling01:09

Synaptic Signaling

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.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...

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Related Experiment Video

Updated: Jun 3, 2026

Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
08:46

Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes

Published on: February 15, 2010

Synaptic vesicle pools: an update.

Annette Denker1, Silvio O Rizzoli

  • 1European Neuroscience Institute, DFG Center for Molecular Physiology of the Brain Göttingen, Germany.

Frontiers in Synaptic Neuroscience
|March 23, 2011
PubMed
Summary
This summary is machine-generated.

Synaptic vesicle pools, including readily releasable, recycling, and reserve pools, are crucial for neuronal communication. Recent research clarifies their distinct behaviors under varying stimulation, supporting an enhanced three-pool model.

Keywords:
spontaneous releasesuper-poolsurface poolsynaptic vesicle poolsvesicle mobilityvesicle recycling

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Synaptic vesicles are functionally and morphologically classified into distinct pools.
  • A previous model proposed three pools: readily releasable, recycling, and reserve.

Purpose of the Study:

  • To review advancements in understanding synaptic vesicle pool behavior.
  • To focus on pool dynamics under strong stimulation and physiological activity.

Main Methods:

  • Literature review and synthesis of recent findings.
  • Analysis of vesicle pool behavior under different stimulation conditions.

Main Results:

  • New findings have refined the three-pool model of synaptic vesicles.
  • The distinction between recycling (mobile) and reserve (fixed) vesicles is highlighted.
  • New concepts, like the identity of the spontaneously recycling pool, have emerged.

Conclusions:

  • The three-pool model provides a robust framework for synaptic vesicle function.
  • Understanding vesicle pool dynamics is key to comprehending synaptic transmission.
  • Ongoing research continues to evolve our understanding of these critical cellular components.