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Related Experiment Video

Updated: Jul 2, 2026

Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
07:51

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Published on: November 14, 2014

Axonal GABAA receptors.

Federico F Trigo1, Alain Marty, Brandon M Stell

  • 1Laboratoire de Physiologie Cérébrale, UFR Biomédicale, Université Paris Descartes, Paris, France.

The European Journal of Neuroscience
|August 12, 2008
PubMed
Summary
This summary is machine-generated.

Axonal GABA receptors (GABA(A)Rs) in the mammalian brain, previously thought inhibitory, are now shown to be excitatory. These receptors modulate neuronal activity by influencing action potential firing and neurotransmitter release.

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Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
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Published on: August 16, 2018

Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Synaptic Plasticity

Background:

  • Type A GABA receptors (GABA(A)Rs) are primarily known as inhibitory in the mature mammalian forebrain.
  • Recent research indicates GABA(A)Rs are also present in the axonal compartment of central nervous system (CNS) neurons.

Purpose of the Study:

  • To investigate the functional role and localization of axonal GABA(A)Rs in the mammalian CNS.
  • To determine whether axonal GABA(A)Rs exhibit inhibitory or excitatory effects on neuronal activity.

Main Methods:

  • Immunohistochemistry and immunogold labeling to visualize axonal GABA(A)R distribution.
  • Direct electrophysiological recordings from single axonal terminals.
  • Application of GABA(A)R modulators to assess effects on action potential generation, axonal calcium signaling, and neurotransmitter release.

Main Results:

  • Axonal GABA(A)Rs are confirmed to be present in the somatodendritic and axonal compartments of CNS neurons.
  • Contrary to previous assumptions, axonal GABA(A)Rs predominantly exhibit excitatory actions in the mammalian brain.
  • Activation of axonal GABA(A)Rs by ambient GABA, spillover, or autocrine signaling increases action potential firing and/or neurotransmitter release.

Conclusions:

  • Axonal GABA(A)Rs are potent modulators of neuronal function in the mammalian CNS.
  • The excitatory effects of axonal GABA(A)Rs can persist into adulthood in certain neuronal populations.
  • These findings challenge the traditional view of GABAergic signaling and highlight a novel excitatory role for GABA(A)Rs in neuronal axons.