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GluR1 links structural and functional plasticity at excitatory synapses.

Charles D Kopec1, Eleonore Real, Helmut W Kessels

  • 1Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 14, 2007
PubMed
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Long-term potentiation (LTP) enhances synaptic strength and spine size by trafficking AMPA receptors. The GluR1 subunit of AMPA receptors links synaptic potentiation to structural changes in dendritic spines.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Long-term potentiation (LTP) models learning and memory, involving synaptic strengthening and dendritic spine enlargement.
  • AMPA receptor insertion mediates synaptic strength increase during LTP, but its role in structural changes is unclear.

Purpose of the Study:

  • To investigate how cells maintain the correlation between dendritic spine size and synapse strength during LTP.
  • To explore the specific role of AMPA receptor trafficking in structural plasticity.

Main Methods:

  • Experiments were conducted in hippocampal slice cultures and in vivo.
  • Investigated the role of the AMPA-type glutamate receptor subunit 1 (GluR1) in synaptic plasticity and structural changes.
  • Utilized a recombinant cytosolic C-terminal fragment (C-tail) of GluR1.

Related Experiment Videos

Main Results:

  • Synaptic insertion of GluR1 is essential for stable increases in dendritic spine size during LTP.
  • The ion channel function of GluR1 is not required for LTP-driven spine enlargement.
  • A GluR1 C-tail fragment alone can induce spine enlargement, even when endogenous GluR1 exocytosis is blocked.

Conclusions:

  • Synaptic insertion of GluR1 has a dual role in LTP: enhancing synaptic strength via its ion channel function and promoting spine enlargement through its C-terminal domain.
  • The GluR1 C terminus provides a structural stabilization effect, enabling spine size increases during plasticity.