Subunit composition of synaptic AMPA receptors revealed by a single-cell genetic approach.

Abstract:

:The precise subunit composition of synaptic ionotropic receptors in the brain is poorly understood. This information is of particular importance with regard to AMPA-type glutamate receptors, the multimeric complexes assembled from GluA1-A4 subunits, as the trafficking of these receptors into and out of synapses is proposed to depend upon the subunit composition of the receptor. We report a molecular quantification of synaptic AMPA receptors (AMPARs) by employing a single-cell genetic approach coupled with electrophysiology in hippocampal CA1 pyramidal neurons. In contrast to prevailing views, we find that GluA1A2 heteromers are the dominant AMPARs at CA1 cell synapses (approximately 80%). In cells lacking GluA1, -A2, and -A3, synapses are devoid of AMPARs, yet synaptic NMDA receptors (NMDARs) and dendritic morphology remain unchanged. These data demonstrate a functional dissociation of AMPARs from trafficking of NMDARs and neuronal morphogenesis. This study provides a functional quantification of the subunit composition of AMPARs in the CNS and suggests novel roles for AMPAR subunits in receptor trafficking.

journal_name

Neuron

journal_title

Neuron

authors

Lu W,Shi Y,Jackson AC,Bjorgan K,During MJ,Sprengel R,Seeburg PH,Nicoll RA

doi

10.1016/j.neuron.2009.02.027

subject

Has Abstract

pub_date

2009-04-30 00:00:00

pages

254-68

issue

2

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(09)00255-4

journal_volume

62

pub_type

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