Homer-dependent cell surface expression of metabotropic glutamate receptor type 5 in neurons

Fabrice Ango, David Robbe, Jian Cheng Tu, Bo Xiao, Paul F. Worley, Jean Philippe Pin, Joël Bockaert, Laurent Fagni

Research output: Contribution to journalArticlepeer-review

127 Scopus citations


The metabotropic glutamate (mGlu) receptors are a family of receptors involved in the tuning of fast excitatory synaptic transmission in the brain. Experiments performed in heterologous expression systems suggest that cell surface expression of group I mGlu receptors is controlled by their auxiliary protein, Homer. However, whether or not this also applies to neurons remains controversial. Here we show that in cultured cerebellar granule cells, the group I mGlu receptor subtype, mGlu5, transfected alone is functionally expressed at the surface of these neurons. Transfected Homer1b caused intracellular retention and clustering of this receptor at synaptic sites. Recombinant Homer1a alone did not affect cell surface expression of the receptor, but in neurons transfected with Homer1b, excitation-induced expression of native Homer1a reversed the intracellular retention of mGlu5 receptors, resulting in the receptor trafficking to synaptic membranes. Transfected Homer1a also increased the latency and amplitude of the mGlu5 receptor Ca2+ response. These results indicate that Homer1 proteins regulate synaptic cycling and Ca2+ signaling of mGlu5 receptors, in response to neuronal activity.

Original languageEnglish (US)
Pages (from-to)323-329
Number of pages7
JournalMolecular and Cellular Neuroscience
Issue number2
StatePublished - 2002

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience
  • Cell Biology


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