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Related Experiment Video

Updated: Jul 9, 2025

Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
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GluD1 binds GABA and controls inhibitory plasticity.

Laura Piot1, Christina Heroven2, Simon Bossi1

  • 1Institut de Biologie de l'ENS (IBENS), Ecole Normale Supérieure, Université PSL, CNRS, INSERM, F-75005 Paris, France.

Science (New York, N.Y.)
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Summary

The GluD1 receptor, an ionotropic glutamate receptor, binds GABA and enhances inhibitory neurotransmission in the hippocampus. This finding challenges the traditional view of distinct glutamatergic and GABAergic receptor functions.

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Molecular Biology

Background:

  • Fast synaptic transmission relies on ionotropic glutamate receptors (iGluRs) for excitation and GABAARs for inhibition.
  • The iGluR family member GluD1 is found at both excitatory and inhibitory synapses, but its role in inhibition is unknown.

Purpose of the Study:

  • To investigate the function of the GluD1 receptor in inhibitory neurotransmission.
  • To determine if GluD1 activation affects GABAergic signaling.

Main Methods:

  • Biochemical analyses
  • Structural analyses
  • Functional analyses
  • Electrophysiology in adult mouse hippocampus

Main Results:

  • GluD1 binds to GABA, a novel function for iGluRs.
  • GluD1 activation enhances GABAergic synaptic currents via a non-ionotropic mechanism.
  • This enhancement is dependent on trans-synaptic anchoring.

Conclusions:

  • GluD1 acts as a GABA receptor, modulating inhibitory synaptic plasticity.
  • This discovery challenges the classical separation of glutamatergic and GABAergic receptor roles.