Subunit composition of synaptic AMPA receptors revealed by a single-cell genetic approach.
Subunit composition of synaptic AMPA receptors revealed by a single-cell genetic approach.
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DOI:
10.1016/j.neuron.2009.02.027
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发表时间:
2009-04-30
期刊:
影响因子:
16.2
通讯作者:
Nicoll, Roger A.
中科院分区:
文献类型:
--
作者:
Lu, Wei;Shi, Yun;Jackson, Alexander C.;Bjorgan, Kirsten;During, Matthew J.;Sprengel, Rolf;Seeburg, Peter H.;Nicoll, Roger A.
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 (~80%). In cells lacking GluA1, -A2 and -A3, synapses are devoid of AMPARs, yet synaptic NMDA receptors 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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