Differences in Cortical versus Subcortical GABAergic Signaling

A Candidate Mechanism of Electroclinical Uncoupling of Neonatal Seizures

Joseph Glykys, Volodymyr I. Dzhala, Kishore Kuchibhotla, Guoping Feng, Thomas Kuner, George Augustine, Brian J. Bacskai, Kevin J. Staley

Research output: Contribution to journalArticle

Abstract

Electroclinical uncoupling of neonatal seizures refers to electrographic seizure activity that is not clinically manifest. Uncoupling increases after treatment with Phenobarbital, which enhances the GABAA receptor (GABAAR) conductance. The effects of GABAAR activation depend on the intracellular Cl- concentration ([Cl-]i) that is determined by the inward Cl- transporter NKCC1 and the outward Cl- transporter KCC2. Differential maturation of Cl- transport observed in cortical versus subcortical regions should alter the efficacy of GABA-mediated inhibition. In perinatal rat pups, most thalamic neurons maintained low [Cl-]i and were inhibited by GABA. Phenobarbital suppressed thalamic seizure activity. Most neocortical neurons maintained higher [Cl-]i, and were excited by GABAAR activation. Phenobarbital had insignificant anticonvulsant responses in the neocortex until NKCC1 was blocked. Regional differences in the ontogeny of Cl- transport may thus explain why seizure activity in the cortex is not suppressed by anticonvulsants that block the transmission of seizure activity through subcortical networks.

Original languageEnglish (US)
Pages (from-to)657-672
Number of pages16
JournalNeuron
Volume63
Issue number5
DOIs
StatePublished - Sep 10 2009
Externally publishedYes

Fingerprint

Seizures
GABA-A Receptors
Phenobarbital
Anticonvulsants
gamma-Aminobutyric Acid
Neurons
Neocortex

Keywords

  • CHEMBIO
  • HUMDISEASE
  • SYSNEURO

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Differences in Cortical versus Subcortical GABAergic Signaling : A Candidate Mechanism of Electroclinical Uncoupling of Neonatal Seizures. / Glykys, Joseph; Dzhala, Volodymyr I.; Kuchibhotla, Kishore; Feng, Guoping; Kuner, Thomas; Augustine, George; Bacskai, Brian J.; Staley, Kevin J.

In: Neuron, Vol. 63, No. 5, 10.09.2009, p. 657-672.

Research output: Contribution to journalArticle

Glykys, Joseph ; Dzhala, Volodymyr I. ; Kuchibhotla, Kishore ; Feng, Guoping ; Kuner, Thomas ; Augustine, George ; Bacskai, Brian J. ; Staley, Kevin J. / Differences in Cortical versus Subcortical GABAergic Signaling : A Candidate Mechanism of Electroclinical Uncoupling of Neonatal Seizures. In: Neuron. 2009 ; Vol. 63, No. 5. pp. 657-672.
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