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Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
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The small GTPase ARF6 regulates GABAergic synapse development.

Hyeonho Kim1, Hyeji Jung1, Hyunsu Jung2,3

  • 1Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), 333 Techno Jungangdae-Ro, Hyeonpoong-eup, Dalseong-gun, Daegu, 42988, South Korea.

Molecular Brain
|January 8, 2020
PubMed
Summary

ADP ribosylation factors (ARFs) are key for cell functions. This study reveals ADP ribosylation factor 6 (ARF6) is crucial for GABAergic synapses in neurons, and its dysfunction increases epilepsy risk.

Keywords:
ARFEpilepsyGABAInhibitory synapse

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • ADP ribosylation factors (ARFs) are small GTPases regulating cellular processes.
  • ARF1 and ARF6 are known to function at glutamatergic synapses in neurons.
  • The role of ARFs at GABAergic synapses remains largely unexplored.

Purpose of the Study:

  • To investigate the role of ARF6 in GABAergic synaptic function.
  • To determine the impact of ARF6 modulation on neuronal network activity and epilepsy.

Main Methods:

  • Localization studies of ARF6 in cultured hippocampal neurons.
  • Knockdown (KD) of ARF6 and ARF1 using genetic approaches.
  • Assessment of GABAergic synaptic puncta and density in vitro and in vivo.
  • Evaluation of seizure susceptibility in an induced epilepsy model.

Main Results:

  • ARF6 protein is localized at GABAergic synapses in hippocampal neurons.
  • ARF6 KD, but not ARF1 KD, significantly reduced GABAergic synaptic puncta and density.
  • ARF6 KD in the dentate gyrus increased susceptibility to seizures in an epilepsy model.

Conclusions:

  • ARF6 plays a critical role in maintaining GABAergic synaptic integrity.
  • Modulating ARF6 activity presents a potential therapeutic strategy for epilepsy and other brain disorders involving hippocampal network dysfunction.