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Related Concept Videos

Integration of Synaptic Events01:28

Integration of Synaptic Events

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...
Plasticity00:58

Plasticity

Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
Neuroplasticity01:01

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...

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Related Experiment Video

Updated: Jun 12, 2026

3D Modeling of Dendritic Spines with Synaptic Plasticity
07:13

3D Modeling of Dendritic Spines with Synaptic Plasticity

Published on: May 18, 2020

Synaptic plasticity, a symphony in GEF.

Drew D Kiraly1, Jodi E Eipper-Mains, Richard E Mains

  • 1Department of Neuroscience, University of Connecticut Health Center, Farmington, CT.

ACS Chemical Neuroscience
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

Rapid changes in dendritic spine structure, crucial for neuronal plasticity, are controlled by Rho-guanine nucleotide exchange factors (GEFs). These GEFs regulate the actin cytoskeleton within spines, influencing synaptic function.

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Last Updated: Jun 12, 2026

3D Modeling of Dendritic Spines with Synaptic Plasticity
07:13

3D Modeling of Dendritic Spines with Synaptic Plasticity

Published on: May 18, 2020

Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
10:52

Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology

Published on: April 23, 2019

Presynaptically Silent Synapses Studied with Light Microscopy
11:02

Presynaptically Silent Synapses Studied with Light Microscopy

Published on: January 4, 2010

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Dendritic spines are key postsynaptic sites in the mammalian brain.
  • Spine structure can change rapidly, impacting neuronal plasticity.
  • The actin cytoskeleton regulates spine dynamics.

Purpose of the Study:

  • To review Rho-guanine nucleotide exchange factors (GEFs) in the nucleus accumbens.
  • To examine the role of Rho-GEFs in postsynaptic density and spine structure.
  • To discuss how Rho-GEFs link receptor systems to synaptic plasticity.

Main Methods:

  • Literature review of Rho-GEFs in the nucleus accumbens.
  • Analysis of Rho-GEF localization at the postsynaptic density.
  • Examination of intracellular signaling cascades and receptor systems.

Main Results:

  • Rho-GEFs are critical regulators of the actin cytoskeleton within dendritic spines.
  • Specific Rho-GEFs are localized to the postsynaptic density, enabling rapid structural changes.
  • Interactions of Rho-GEFs with receptors and signaling pathways influence synaptic plasticity.

Conclusions:

  • Rho-GEFs are essential for controlling rapid dendritic spine alterations.
  • Understanding Rho-GEF function is key to elucidating mechanisms of neuronal plasticity.
  • Targeting Rho-GEFs may offer insights into brain function and dysfunction.