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Updated: Aug 4, 2026

Quantifying Synapses: an Immunocytochemistry-based Assay to Quantify Synapse Number
Published on: November 16, 2010
Neural and immunological synaptic relations
Michael L Dustin1, David R Colman
1Program in Molecular Pathogenesis, Skirball Institute of Biomolecular Medicine, Department of Pathology, New York University School of Medicine, New York, NY 10016 USA. dustin@saturn.med.nyu.edu
Insights
Synapses are cell junctions enabling information transfer via secretion in nervous and immune systems. Their structure involves active zones for secretion and adhesion domains, with surface molecules modulating function.
Area of Science:
- Cell biology
- Neuroscience
- Immunology
Background:
- Synapses are specialized cell junctions crucial for intercellular communication.
- Both the nervous and immune systems employ synapses for directed signaling.
- Synaptic structure features active zones for secretion and surrounding adhesion domains.
Purpose of the Study:
- To describe the fundamental structure and function of synapses.
- To highlight the role of synapses in the nervous and immune systems.
- To discuss the influence of surface molecules on synaptic function.
Main Methods:
- Review of existing literature on synaptic structure and function.
- Analysis of molecular components within synaptic microdomains.
- Comparative study of synaptic mechanisms in different cell types.
Main Results:
- Synapses facilitate information relay through controlled secretion.
- Microdomain structure includes central active zones and peripheral adhesion domains.
- Surface molecules are integral to modulating synaptic activity.
Conclusions:
- Synapses are conserved signaling platforms across different biological systems.
- The structural organization of synapses underlies their functional specificity.
- Modulation of synaptic function is achieved through dynamic molecular interactions.
Abstract:
A synapse is a stable adhesive junction between two cells across which information is relayed by directed secretion. The nervous system and immune system utilize these specialized cell surface contacts to directly convey and transduce highly controlled secretory signals between their constituent cell populations. Each of these synaptic types is built around a microdomain structure comprising central active zones of exocytosis and endocytosis encircled by adhesion domains. Surface molecules that may be incorporated into and around the active zones contribute to modulation of the functional state of the synapse.
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The Synapse
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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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