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Related Experiment Video

Updated: Jul 5, 2026

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings
07:31

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings

Published on: May 7, 2020

[Epileptiform activities generated in vitro by human temporal lobe tissue].

G Huberfeld1, S Clemenceau, I Cohen

  • 1Inserm U739 Cortex & Epilepsie, université Pierre-et-Marie-Curie, CHU de la Pitié-Salpêtrière, 105, boulevard de l'Hôpital, 75013 Paris, France. gilles.huberfeld@chups.jussieu.fr

Neuro-Chirurgie
|April 19, 2008
PubMed
Summary

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Hippocampus and epilepsy: Findings from human tissues.

Revue neurologique·2015

Drug-resistant epilepsy tissue in vitro reveals that bumetanide, a diuretic, can suppress interictal activity by restoring normal GABAergic signaling in subicular cells.

Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Cellular Electrophysiology

Context:

  • Drug-resistant epilepsies, particularly temporal lobe epilepsy with hippocampal sclerosis, provide unique models for studying human epileptic activity in vitro.
  • Surgical resection of epileptogenic zones yields brain tissue slices retaining functional neuronal networks capable of generating epileptic activity.

Purpose:

  • To investigate the mechanisms underlying spontaneous interictal-like activity in temporal lobe epilepsy tissues.
  • To explore the role of GABAergic signaling and intracellular chloride concentration in initiating and sustaining epileptic discharges.

Summary:

  • Neocortical tissue typically requires convulsants to induce epileptic activity, dependent on GABAergic signaling and extracellular potassium.
  • Temporal lobe epilepsy tissues with hippocampal sclerosis spontaneously generate interictal-like activity originating in the subiculum.

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Last Updated: Jul 5, 2026

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  • This activity is sustained by paradoxical excitation of subicular pyramidal cells via GABAergic signaling, linked to elevated intracellular chloride due to altered NKCC1 and KCC2 cotransporter expression.

    • Impact:

    • Identifies a specific cellular defect involving chloride cotransporters (NKCC1, KCC2) in subicular cells contributing to epilepsy.
    • Demonstrates that blocking excessive NKCC1 with bumetanide normalizes GABAergic actions and suppresses interictal activity.
    • Suggests potential therapeutic strategies targeting chloride homeostasis for drug-resistant epilepsy.