Homeostatic Regulation of Synaptic GlyR Numbers Driven by Lateral Diffusion

Sabine Lévi, Claude Schweizer, Hiroko Bannai, Olivier Pascual, Cécile Charrier, Antoine Triller

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

In the spinal cord, most inhibitory synapses have a mixed glycine-GABA phenotype. Using a pharmacological approach, we report an NMDAR activity-dependent regulation of the mobility of GlyRs but not GABAARs at inhibitory synapses in cultured rat spinal cord neurons. The NMDAR-induced decrease in GlyR lateral diffusion was correlated with an increase in receptor cluster number and glycinergic mIPSC amplitude. Changes in GlyR diffusion properties occurred rapidly and before the changes in the number of synaptic receptors. Regulation of synaptic GlyR content occurred without change in the amount of gephyrin. Moreover, NMDAR-dependent regulation of GlyR lateral diffusion required calcium influx and calcium release from stores. Therefore, excitation may increase GlyR levels at synapses by a calcium-mediated increase in postsynaptic GlyR trapping involving regulation of receptor-scaffold interactions. This provides a mechanism for a rapid homeostatic regulation of the inhibitory glycinergic component at mixed glycine-GABA synapses in response to increased NMDA excitatory transmission.

Original languageEnglish
Pages (from-to)261-273
Number of pages13
JournalNeuron
Volume59
Issue number2
DOIs
Publication statusPublished - 2008 Jul 31

Keywords

  • CELLBIO
  • MOLIMMUNO
  • SIGNALING

ASJC Scopus subject areas

  • Neuroscience(all)

Fingerprint Dive into the research topics of 'Homeostatic Regulation of Synaptic GlyR Numbers Driven by Lateral Diffusion'. Together they form a unique fingerprint.

Cite this