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NMDA receptors regulate GABA(A) receptor lateral mobility and clustering at inhibitory synapses through serine 327 on the gamma 2 subunit

Muir, J; Arancibia-Carcamo, IL; MacAskill, AF; Smith, KR; Griffin, LD; Kittler, JT; (2010) NMDA receptors regulate GABA(A) receptor lateral mobility and clustering at inhibitory synapses through serine 327 on the gamma 2 subunit. Proceedings of the National Academy of Sciences of the United States of America , 107 (38) 16679 - 16684. 10.1073/pnas.1000589107.

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Abstract

Modification of the number of GABA(A) receptors (GABA(A)Rs) clustered at inhibitory synapses can regulate inhibitory synapse strength with important implications for information processing and nervous system plasticity and pathology. Currently, however, the mechanisms that regulate the number of GABA(A)Rs at synapses remain poorly understood. By imaging superecliptic pHluorin tagged GABA(A)R subunits we show that synaptic GABA(A)R clusters are normally stable, but that increased neuronal activity upon glutamate receptor (GluR) activation results in their rapid and reversible dispersal. This dispersal correlates with increases in the mobility of single GABA(A)Rs within the clusters as determined using single-particle tracking of GABA(A)Rs labeled with quantum dots. GluR-dependent dispersal of GABA(A)R clusters requires Ca2+ influx via NMDA receptors (NMDARs) and activation of the phosphatase calcineurin. Moreover, the dispersal of GABA(A)R clusters and increased mobility of individual GABA(A)Rs are dependent on serine 327 within the intracellular loop of the GABA(A)R gamma 2 subunit. Thus, NMDAR signaling, via calcineurin and a key GABA(A)R phosphorylation site, controls the stability of synaptic GABA(A)Rs, with important implications for activity-dependent control of synaptic inhibition and neuronal plasticity.

Type:Article
Title:NMDA receptors regulate GABA(A) receptor lateral mobility and clustering at inhibitory synapses through serine 327 on the gamma 2 subunit
DOI:10.1073/pnas.1000589107
Publisher version:http://dx.doi.org/10.1073/pnas.1000589107
Language:English
Keywords:ion channels, plasticity, trafficking, diffusion, calcineurin, PHOSPHO-DEPENDENT BINDING, GABAERGIC INHIBITION, NEURONAL INHIBITION, SYNAPTIC INHIBITION, DIFFUSION DYNAMICS, STATUS EPILEPTICUS, AP2 COMPLEX, A RECEPTOR, PHOSPHORYLATION, TRAFFICKING
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Life Sciences > Biosciences (Division of) > Neuroscience, Physiology and Pharmacology
UCL > School of BEAMS > Faculty of Engineering Science > Computer Science

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