Equilibrium potential of GABA(A) current and implications for rebound burst firing in rat subthalamic neurons in vitro

Mark D. Bevan*, Charles J. Wilson, J. Paul Bolam, Peter J. Magill

*Corresponding author for this work

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

Reciprocally connected glutamatergic subthalamic and GABAergic globus pallidus neurons have recently been proposed to act as a generator of low- frequency oscillatory activity in Parkinson's disease. To determine whether GABA(A) receptor-mediated synaptic potentials could theoretically generate rebound burst firing in subthalamic neurons, a feature that is central to the proposed oscillatory mechanism, we determined the equilibrium potential of GABA(A) current (EGABA(A)) and the degree of hyperpolarization required for rebound firing using perforated-patch recording. [n the majority of neurons that fired rebounds, EGABA(A) was equal to or more hyperpolarized than the hyperpolarization required for rebound burst firing. These data suggest that synchronous activity of pallidal inputs could underlie rhythmic bursting activity of subthalamic neurons in Parkinson's disease.

Original languageEnglish (US)
Pages (from-to)3169-3172
Number of pages4
JournalJournal of neurophysiology
Volume83
Issue number5
DOIs
StatePublished - 2000

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology

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