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Related Concept Videos

Chemical Synapses01:26

Chemical Synapses

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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.
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...
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Chemical Synapses01:26

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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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Integration of Synaptic Events01:28

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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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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.
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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.
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Synaptic Signaling01:12

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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.
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Stochastic self-assembly of reaction-diffusion patterns in synaptic membranes.

Everest Law1, Yiwei Li1, Osman Kahraman1

  • 1Department of Physics and Astronomy and Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, California 90089, USA.

Physical Review. E
|August 20, 2021
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Summary
This summary is machine-generated.

Synaptic receptor and scaffold molecules self-assemble into membrane domains crucial for nerve cell communication. Stochastic simulations reveal this process is accelerated and stabilized by inherent noise, influencing receptor numbers.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Computational Biology

Background:

  • Synaptic receptor and scaffold molecules form membrane protein domains essential for chemical synapse signal transmission.
  • Previous research suggests receptor-scaffold domain formation relies on reaction and diffusion processes.

Purpose of the Study:

  • To explore the self-assembly of synaptic receptor-scaffold domains using kinetic Monte Carlo (KMC) simulations.
  • To investigate the role of reaction-diffusion dynamics in domain formation and properties.

Main Methods:

  • Stochastic lattice model simulating receptor and scaffold reaction-diffusion dynamics.
  • Kinetic Monte Carlo (KMC) simulations were employed to model self-assembly processes.
  • Comparison of KMC simulation results with mean-field calculations.

Main Results:

  • KMC simulations successfully reproduced the self-assembly of receptor-scaffold domains of experimentally observed sizes.
  • Intrinsic noise in reaction and diffusion processes was found to accelerate domain self-assembly and enhance robustness.
  • Simulations confirmed a higher prevalence of scaffolds over receptors within domains, consistent with experimental data.

Conclusions:

  • Receptor-scaffold reaction-diffusion dynamics inherently drive self-assembly of synaptic domains.
  • Stochasticity in these processes enhances assembly speed and stability.
  • This mechanism offers a potential pathway for nerve cells to regulate receptor numbers and synaptic plasticity.