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Antisecretory Factor Modulates GABAA Receptor Activity in Neurons.

V Bazzurro1, E Gatta1, Aroldo Cupello2

  • 1Department of Physics, University of Genoa, Via Dodecaneso 33, 16146, Genoa, Italy.

Journal of Molecular Neuroscience : MN
|January 9, 2018
PubMed
Summary

Antisecretory factor (AF) peptide AF-16 enhances GABA-activated currents in cerebellar neurons by increasing GABAA receptor expression. This suggests a novel mechanism for AF

Keywords:
Antisecretory factorCentral nervous systemCerebellar granule cellsEnteric nervous systemGABAA receptorsPatch clamp

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Antisecretory factor (AF) is an endogenous protein with anti-inflammatory and anti-hypersecretory properties.
  • The precise mechanism underlying AF's action remains largely unknown.
  • Neuronal GABAA receptors are crucial for inhibitory neurotransmission.

Purpose of the Study:

  • To investigate the effect of a potent AF peptide (AF-16) on neuronal GABAA receptors.
  • To elucidate the mechanism by which AF influences GABAergic signaling.

Main Methods:

  • Whole-cell patch clamp electrophysiology on cultured rat cerebellar granule cells.
  • Application of neurotransmitter GABA and AF-16 via perfusion.
  • Immunocytochemical fluorescence using anti-γ2 subunit antibodies.

Main Results:

  • AF-16 preincubation significantly elevated rapidly desensitizing GABA-activated chloride currents.
  • The effect was observed at a low Ki (41 pM) and increased maximal current (37%) without altering GABA affinity.
  • Immunofluorescence confirmed an increased expression of GABAA receptors on the neuronal membrane.

Conclusions:

  • AF-16 enhances GABAergic neurotransmission by increasing the number of functional GABAA receptors on the neuronal surface.
  • This study reveals a novel mechanism for AF action involving modulation of GABAA receptor expression.
  • Findings have implications for understanding AF's role in the enteric nervous system and brain function.