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

by: W. Lu, Y. Shi, A. C. Jackson, K. Bjorgan, M. J. During, R. Sprengel, P. H. Seeburg, and R. A. Nicoll

In: Neuron, Vol. 62, Nr. 2 (April 2009) , p. 254--268.

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URL:	http://dx.doi.org/10.1016/j.neuron.2009.02.027
DOI:	10.1016/j.neuron.2009.02.027

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.

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BibTeX record

@article{citeulike:4502527,
  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.},
  added-at = {2009-05-19T18:00:18.000+0200},
  author = {Lu, W. and Shi, Y. and Jackson, A. C. and Bjorgan, K. and During, M. J. and Sprengel, R. and Seeburg, P. H. and Nicoll, R. A.},
  biburl = {http://www.bibsonomy.org/bibtex/228ba9ed5aec76898e633ef1ad1c7cd36/earthfare},
  citeulike-article-id = {4502527},
  description = {CiteULike: Everyone's library},
  doi = {10.1016/j.neuron.2009.02.027},
  interhash = {4c577e576319ec7aa3291e90d42ba177},
  intrahash = {28ba9ed5aec76898e633ef1ad1c7cd36},
  issn = {1097-4199},
  journal = {Neuron},
  keywords = {ampa, composition, jc, subunit, sukwon},
  month = {April},
  number = 2,
  pages = {254--268},
  posted-at = {2009-05-19 08:05:26},
  priority = {2},
  timestamp = {2009-05-19T18:00:18.000+0200},
  title = {Subunit composition of synaptic AMPA receptors revealed by a single-cell genetic approach.},
  url = {http://dx.doi.org/10.1016/j.neuron.2009.02.027},
  volume = 62,
  year = 2009
}

Endnote record

%0 Journal Article
%1 citeulike:4502527
%A Lu, W.
%A Shi, Y.
%A Jackson, A. C.
%A Bjorgan, K.
%A During, M. J.
%A Sprengel, R.
%A Seeburg, P. H.
%A Nicoll, R. A.
%D 2009
%J Neuron
%K 
%N 2
%P 254--268
%T Subunit composition of synaptic AMPA receptors revealed by a single-cell genetic approach.
%R 10.1016/j.neuron.2009.02.027
%U http://dx.doi.org/10.1016/j.neuron.2009.02.027
%V 62
%X 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.