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Fusion of Secretory Vesicles with the Plasma Membrane01:26

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An Optical Assay for Synaptic Vesicle Recycling in Cultured Neurons Overexpressing Presynaptic Proteins
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Published on: June 26, 2018

Neuroligin 1 is dynamically exchanged at postsynaptic sites.

Inga U Schapitz1, Bardo Behrend, Yvonne Pechmann

  • 1Center for Molecular Neurobiology (ZMNH), University of Hamburg Medical School, D-20251 Hamburg, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 24, 2010
PubMed
Summary

Synaptic plasticity regulates neuroligin turnover via active transport. Long-term depression (LTD) causes neuroligin internalization, impacting synaptic structure and function.

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Molecular Biology

Background:

  • Neuroligins are key postsynaptic cell adhesion molecules crucial for synapse formation and function.
  • Dysfunction of neuroligins is implicated in impaired synaptic transmission and cognitive diseases.
  • Synaptic plasticity, including long-term potentiation and depression, dynamically alters synaptic strength.

Purpose of the Study:

  • To investigate the regulation of neuroligin turnover during synaptic plasticity.
  • To elucidate the mechanisms underlying neuroligin internalization and trafficking.
  • To understand the role of cytoskeleton and motor proteins in neuroligin dynamics.

Main Methods:

  • Chemical induction of long-term potentiation (LTP) and long-term depression (LTD) in hippocampal neurons.
  • Use of GFP-tagged neuroligin 1 to track its localization and dynamics.
  • Investigating the role of the microtubule cytoskeleton and dynein motor complex.
  • Genetic manipulation in mice to deplete dynein function.
  • Application of PSD-95 peptide and neuroligin 1 C-terminal mutagenesis.

Main Results:

  • LTD induces neuroligin 1/3 turnover, leading to decreased surface membrane levels.
  • Neuroligin 1 internalization during LTD requires an intact microtubule cytoskeleton.
  • Neuroligin 1 and PSD-95 associate with the dynein motor complex and undergo retrograde transport.
  • Depletion of dynein function results in postsynaptic neuroligin and PSD-95 enrichment, increased PSD length, and larger spine heads.

Conclusions:

  • Synaptic plasticity dynamically regulates neuroligin turnover through active cytoskeleton-dependent transport.
  • The dynein motor complex plays a critical role in retrograde transport of neuroligin and PSD-95.
  • These findings reveal a novel mechanism linking synaptic activity to the regulation of postsynaptic structure and protein composition.