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Epileptiform synchronization in the human dysplastic cortex.

Massimo Avoli1, Jacques Louvel, Donatella Mattia

  • 1Department of Neurology & Neurosurgery, McGill University, Montréal, Québec, H3A 2B4, Canada. massimo.avoli@mcgill.ca

Epileptic Disorders : International Epilepsy Journal with Videotape
|November 18, 2003
PubMed
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Focal cortical dysplasia tissue in brain slices can generate seizure-like events when exposed to 4-aminopyridine. This intrinsic epileptiform activity, driven by excitatory and inhibitory receptors, is unique to dysplastic neocortex.

Area of Science:

  • Neuroscience
  • Epileptology
  • Cellular Biology

Background:

  • Focal cortical dysplasia (FCD) involves abnormal cortical lamination with aberrant cells, leading to epileptic discharges.
  • Dysplastic neocortex retains connectivity, enabling seizure expression.
  • Understanding FCD's intrinsic properties is crucial for epilepsy research.

Purpose of the Study:

  • To investigate the in vitro epileptiform activity of surgically-resected human focal cortical dysplasia tissue.
  • To compare the electrical properties of FCD tissue with normal human neocortex.
  • To identify the mechanisms underlying seizure generation in FCD.

Main Methods:

  • Analysis of surgically-resected human FCD tissue maintained in brain slice preparations.
  • In vitro challenge with the convulsant drug 4-aminopyridine (4-AP).

Related Experiment Videos

  • Comparison with neocortical slices from patients without significant structural lesions.

    • Main Results:

    • FCD brain slices demonstrated an intrinsic ability to generate ictal-like epileptiform events upon 4-AP challenge.
    • 4-AP-induced ictal discharges were absent in normal neocortical slices.
    • These discharges were mediated by excitatory amino acid receptors, particularly N-methyl-D-aspartate (NMDA) type, and GABA(A) receptor conductances.

    Conclusions:

    • Focal cortical dysplasia tissue possesses intrinsic epileptogenic properties.
    • The generation of ictal discharges is dependent on specific receptor activation (NMDA and GABA(A)).
    • These findings highlight the unique cellular mechanisms contributing to seizures in FCD.