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Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo
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Neuronal activity controls transsynaptic geometry.

Oleg O Glebov1,2, Susan Cox3, Lawrence Humphreys2

  • 1Wolfson Centre for Age-Related Diseases, King's College London, London SE1 1UL, UK.

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Summary
This summary is machine-generated.

Neuronal activity dynamically alters synaptic geometry, repositioning key zones like the active zone (AZ) and postsynaptic density (PSD). This synaptic reorganization is a potential mechanism for homeostatic synaptic plasticity.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • The precise arrangement of synaptic subdomains—presynaptic vesicle zone (SVZ), active zone (AZ), and postsynaptic density (PSD)—is crucial for neuronal synapse function.
  • Mechanisms governing the relative positioning of these synaptic zones are largely unknown.

Purpose of the Study:

  • To investigate the dynamic regulation of synaptic geometry in response to neuronal activity.
  • To explore how synaptic component localization is controlled and its implications for synaptic plasticity.

Main Methods:

  • High-throughput quantitative confocal imaging
  • Super-resolution microscopy
  • Electron microscopy
  • Bayesian blinking and bleaching (3B) reconstruction

Main Results:

  • Silencing neuronal activity caused reversible changes in synaptic geometry.
  • Increased overlap between active zone (AZ) and postsynaptic density (PSD) markers was observed.
  • Decreased spatial coupling between the presynaptic vesicle zone (SVZ) and active zone (AZ).
  • Bayesian blinking and bleaching (3B) reconstruction showed a 30 nm decrease in the AZ-PSD distance.
  • Electron microscopy revealed a 1.1 nm decrease in synaptic cleft width.

Conclusions:

  • Synaptic geometry is dynamically regulated by neuronal activity.
  • Mutual repositioning of synaptic components may represent a novel mechanism underlying homeostatic synaptic plasticity.