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Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

Assembly of Signaling Complexes

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...

Postsynaptic Potential (PSP)

Postsynaptic Potential (PSP)

Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...

Synaptic Signaling

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...

Synaptic Signaling

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.

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Related Experiment Video

Updated: Apr 16, 2026

Analyzing Synaptic Modulation of Drosophila melanogaster Photoreceptors after Exposure to Prolonged Light

Analyzing Synaptic Modulation of Drosophila melanogaster Photoreceptors after Exposure to Prolonged Light

Published on: February 10, 2017

The presynaptic active zone: A dynamic scaffold that regulates synaptic efficacy.

Katrin Michel¹, Johannes Alexander Müller¹, Ana-Maria Oprişoreanu¹

¹Section for Translational Epilepsy Research, Department of Neuropathology, University of Bonn Medical Center, 53105 Bonn, Germany.

Experimental Cell Research

|February 28, 2015

Summary

Synaptic vesicles dock at the active zone (AZ) before neurotransmitter release. The AZ protein network dynamically remodels, potentially underlying synaptic plasticity and function.

Keywords:

Active zone Docking Synaptic plasticity Synaptic vesicle Tethering Ultrastructure

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Last Updated: Apr 16, 2026

Analyzing Synaptic Modulation of Drosophila melanogaster Photoreceptors after Exposure to Prolonged Light

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Published on: February 10, 2017

An Optical Assay for Synaptic Vesicle Recycling in Cultured Neurons Overexpressing Presynaptic Proteins

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Presynaptically Silent Synapses Studied with Light Microscopy

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Published on: January 4, 2010

Area of Science:

Neuroscience
Cell Biology
Molecular Biology

Background:

Synaptic vesicle exocytosis occurs at the presynaptic active zone (AZ).
The AZ is a protein network regulating neurotransmitter release.
Neuronal activity influences AZ protein composition and synaptic release properties.

Purpose of the Study:

To review recent advancements in understanding active zone molecular composition and ultrastructure.
To discuss the dynamic remodeling of the active zone protein network.
To explore the role of the AZ in synaptic plasticity.

Main Methods:

Review of recent literature and novel techniques.
Analysis of active zone molecular identity and ultrastructure.
Correlation of active zone composition with synaptic efficacy.

Main Results:

Novel techniques have enhanced understanding of active zone components and the SV release machinery.
Active zones are dynamic structures, with composition and size linked to synaptic efficacy.
Dynamic remodeling of the AZ protein network is a key mechanism for synaptic plasticity.

Conclusions:

The active zone is a dynamic structure crucial for synaptic function.
Remodeling of the AZ protein network underlies synaptic plasticity.
Further research into the AZ's role in synaptic function is warranted.