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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Signaling

Background:

  • GABAA receptor activity is modulated by phosphorylation.
  • The role of alpha subunit phosphorylation by signaling kinases is largely unknown.
  • Extracellular-signal regulated kinase (ERK) is a key MAPK pathway effector.

Purpose of the Study:

  • Investigate the functional relevance of a putative ERK phosphorylation site on the GABAA receptor alpha subunit.
  • Determine if ERK signaling influences GABA-gated currents.
  • Elucidate the role of the MAPK pathway in GABAA receptor regulation.

Main Methods:

  • Utilized HEK293 cells expressing alpha1beta2gamma2 GABAA receptors.
  • Employed pharmacological inhibition of MEK (upstream of ERK) with UO126.
  • Performed perforated and conventional whole-cell patch-clamp recordings.
  • Introduced mutations at the putative ERK phosphorylation site (T375A).

Main Results:

  • UO126 treatment reduced ERK phosphorylation and enhanced GABA-induced peak currents.
  • Current enhancement was dependent on an intact intracellular environment.
  • Mutation of the T375 site abolished the UO126-mediated current enhancement.
  • MAPK pathway inhibition increased GABAA receptor function.

Conclusions:

  • The MAPK pathway, via ERK, negatively modulates GABAA receptor function.
  • Phosphorylation of the alpha subunit by ERK is a key mechanism regulating GABAA receptor activity.
  • These findings identify a novel regulatory pathway for GABAA receptor function.