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Neocortical hyperexcitability after GABA withdrawal in vitro.

E Calixto1, A M López-Colomé, C Casasola

  • 1Instituto de Fisiología Celular, UNAM, Mexico City DF, Mexico.

Epilepsy Research
|February 26, 2000
PubMed
Summary

Sudden withdrawal of gamma-aminobutyric acid (GABA) or benzodiazepines in vitro induces hyperexcitability in neocortical slices. This GABA withdrawal effect involves presynaptic changes and altered GABA(A) receptor sensitivity, mimicking withdrawal syndromes.

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Area of Science:

  • Neuroscience
  • Neurophysiology
  • Pharmacology

Background:

  • Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the mammalian brain.
  • Abrupt cessation of GABAergic agents can precipitate hyperexcitability and seizures.
  • Understanding withdrawal mechanisms is crucial for managing neurological disorders and medication side effects.

Purpose of the Study:

  • To investigate the in vitro induction of hyperexcitability following GABA withdrawal.
  • To explore the cellular and synaptic changes associated with GABA withdrawal.
  • To examine the role of progesterone and GABA(A) receptor sensitivity in withdrawal phenomena.

Main Methods:

  • Neocortical slices were superfused with gamma-aminobutyric acid (GABA) or benzodiazepines.

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  • GABA or benzodiazepine withdrawal was induced by altering superfusion solutions.
  • Evoked population spikes (PS) were recorded to assess neuronal excitability.
  • GABA transmission, release, and receptor binding/sensitivity were analyzed.

    • Main Results:

    • Sudden withdrawal of GABA or flunitrazepam from superfusion significantly increased population spike amplitude.
    • Hyperexcitability developed gradually, peaking at 150% above control levels 2.5 hours post-withdrawal.
    • Evidence suggests both presynaptic (impaired GABA transmission, reduced release) and postsynaptic (enhanced sensitivity to neurosteroids) alterations.
    • Progesterone facilitated the GABA withdrawal-induced hyperexcitability.

    Conclusions:

    • In vitro GABA withdrawal reliably induces cortical hyperexcitability, modeling in vivo seizure phenomena.
    • The findings highlight the involvement of presynaptic GABAergic function impairment and altered GABA(A) receptor modulation in withdrawal syndromes.
    • These cellular changes provide insights into the neurobiological basis of abrupt medication cessation effects.