Switching of NMDA receptor 2A and 2B subunits at thalamic and cortical synapses during early postnatal development

Xiao Bo Liu, Karl D Murray, Edward G. Jones

Research output: Contribution to journalArticle

216 Citations (Scopus)

Abstract

Switching of the NMDA receptor 2A (NR2A) and NR2B subunits at NMDA receptors is thought to underlie the functional changes that 7 occur in NMDA receptor properties during the developmental epoch when neural plasticity is most pronounced. The cellular expression of NR2A and NR2B and the NR2 synaptic binding protein postsynaptic density-95 (PSD-95) was examined in the mouse somatosensory cortex and thalamus from postnatal day 2 (P2) to P15 using reverse transcription-PCR, in situ hybridization histochemistry, and immunocytochemistry. The localization of NR2A and NR2B subunits and PSD-95 was then studied at synapses in layer IV of somatosensory cortex and in the ventral posterior nucleus of the thalamus using high-resolution immunoelectron microscopy. At both cortical and thalamic synapses, a quantitative switch in the dominant synaptic subunit from NR2B to NR2A was accompanied by a similar change in the cellular expression of NR2A but not of NR2B. Synaptic PSD-95 developed independently, although both NR2A and NR2B colocalized with PSD-95. Displacement of NR2B subunits from synapses was not accompanied by an increase in an extrasynaptic pool of this subunit. Thus, the switch in synaptic NR2 subunit predominance does not occur by changes in expression or displacement from synapses and may reflect the formation of new synapses from which NR2B is lacking.

Original languageEnglish (US)
Pages (from-to)8885-8895
Number of pages11
JournalJournal of Neuroscience
Volume24
Issue number40
DOIs
StatePublished - Oct 6 2004

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Synapses
Post-Synaptic Density
Ventral Thalamic Nuclei
Somatosensory Cortex
N-Methyl-D-Aspartate Receptors
Posterior Thalamic Nuclei
Neuronal Plasticity
Immunoelectron Microscopy
Thalamus
Reverse Transcription
In Situ Hybridization
NR2B NMDA receptor
N-methyl D-aspartate receptor subtype 2A
Carrier Proteins
Immunohistochemistry
Polymerase Chain Reaction

Keywords

  • Glutamate receptors
  • Immunogold
  • mRNA
  • Plasticity
  • Synaptic transmission
  • Thalamocortical

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Switching of NMDA receptor 2A and 2B subunits at thalamic and cortical synapses during early postnatal development. / Liu, Xiao Bo; Murray, Karl D; Jones, Edward G.

In: Journal of Neuroscience, Vol. 24, No. 40, 06.10.2004, p. 8885-8895.

Research output: Contribution to journalArticle

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