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NMDA receptor subunit composition controls synaptogenesis and synapse stabilization.

Abigail C Gambrill1, Andres Barria

  • 1Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, WA 98195-7290, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 24, 2011
PubMed
Summary
This summary is machine-generated.

The ratio of NR2B to NR2A NMDA receptor subunits controls synapse formation and spine dynamics during early brain development. This ratio is critical for proper synaptogenesis and synapse maturation in the hippocampus.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • Synaptogenesis in the rat hippocampus coincides with a shift in NMDA receptor subunits from NR2B to NR2A during early postnatal development.
  • The precise impact of this NR2 subunit switch on synapse maturation and stabilization remains incompletely understood.

Purpose of the Study:

  • To investigate the role of NR2A and NR2B subunits in hippocampal synaptogenesis during early postnatal development.
  • To elucidate how the developmental switch in NMDA receptor composition influences synapse formation, maturation, and stabilization.

Main Methods:

  • Utilized organotypic hippocampal slices to study NMDA receptor subunit function.
  • Manipulated the expression levels of NR2A and NR2B subunits to assess their effects on synaptic structures.
  • Investigated the role of the C-terminal domains of NR2 subunits in synapse development.

Main Results:

  • Early expression of NR2A reduced synapse number and spine volume/dynamics.
  • Overexpression of NR2B increased spine motility but did not alter normal synapse number or growth.
  • The C terminus of NR2B, particularly CaMKII binding, supported synapse formation and maturation, while the NR2A C terminus inhibited synapse number and spine growth.

Conclusions:

  • The ratio of synaptic NR2B to NR2A subunits is a key regulator of spine motility and synaptogenesis.
  • The intracellular C terminus of NR2 subunits plays a structural role in recruiting essential signaling and scaffolding molecules for synaptogenesis.