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Related Concept Videos

The Synapse02:47

The Synapse

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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Overview of Synapses01:25

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A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
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Synaptic Signaling01:09

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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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Fusion of Secretory Vesicles with the Plasma Membrane01:26

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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...
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Updated: Jul 9, 2025

Presynapse Formation Assay Using Presynapse Organizer Beads and “Neuron Ball” Culture
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Presynapse Formation Assay Using Presynapse Organizer Beads and “Neuron Ball” Culture

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S-SCAM is essential for synapse formation.

Nina Wittenmayer1,2, Andonia Petkova-Tuffy1, Maximilian Borgmeyer2

  • 1Institute of Anatomy and Embryology, University Medical Center Göttingen, Göttingen, Germany.

Frontiers in Cellular Neuroscience
|December 4, 2023
PubMed
Summary
This summary is machine-generated.

Synapse formation is crucial for neural circuits. Knocking down S-SCAM protein disrupts synapse assembly, impairing neural development and function.

Keywords:
neuronal morphologyscaffolding proteinspinesynapse formationsynaptic transmission

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Developmental Biology

Background:

  • Synapse formation is essential for neural circuit development.
  • The synaptic scaffolding protein S-SCAM/MAGI-2 is involved in post-synaptic signaling complex assembly.
  • The comprehensive role of S-SCAM in overall synapse establishment remains unclear.

Purpose of the Study:

  • To investigate the role of S-SCAM in synapse formation and neural circuit development.
  • To determine the effects of S-SCAM knockdown on synaptic structure and function.
  • To elucidate S-SCAM's involvement in the recruitment of synaptic components.

Main Methods:

  • RNA interference (RNAi)-induced S-SCAM knockdown in vitro and in vivo.
  • Analysis of synapse number, dendritic spine density, and dendritic arborization.
  • Assessment of pre- and post-synaptic component clustering using immunofluorescence.
  • Electrophysiological recordings to evaluate synaptic transmission.
  • Next-generation sequencing to analyze gene expression profiles.

Main Results:

  • S-SCAM knockdown significantly reduced synapse numbers during early network development in vitro.
  • In vivo knockdown led to decreased dendritic spine density in the rat neocortex.
  • Reduced S-SCAM levels impaired the clustering of pre- and post-synaptic proteins and cell adhesion molecules, indicating failed synapse formation.
  • Neurons exhibited impaired synaptic transmission and reduced dendritic arborization.
  • Next-generation sequencing revealed altered expression of 39 synaptic signaling molecules.

Conclusions:

  • S-SCAM is critical for the assembly of diverse synaptic components, including scaffolding proteins, vesicle proteins, and cell adhesion molecules.
  • S-SCAM plays a vital role in mediating the recruitment of all key molecular classes during synapse formation.
  • The protein is essential for the proper development and function of neural circuits in the developing brain.