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Absence seizures decrease steroid modulation of t-[35S]butylbicyclophosphorothionate binding in thalamic relay nuclei

P K Banerjee1, R W Olsen, N J Tillakaratne

  • 1Division of Neurology and the Brain and Behavior Program, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada.

The Journal of Pharmacology and Experimental Therapeutics
|November 10, 1998
PubMed
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Absence seizures rapidly diminish neuroactive steroid effects on GABAA receptors in the thalamus. This loss of steroid modulation occurs during seizures, impacting [35S]TBPS binding, but not GABA or pentobarbital effects.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Epilepsy Research

Background:

  • GABAA receptors are crucial for neuronal inhibition.
  • Neuroactive steroids modulate GABAA receptor function.
  • Absence seizures involve disruptions in thalamocortical circuits.

Purpose of the Study:

  • To investigate the impact of absence seizures on neuroactive steroid modulation of GABAA receptors.
  • To examine the binding of t-butylbicyclophosphorothionate ([35S]TBPS) to GABAA receptors in the thalamus during seizures.
  • To differentiate steroid effects from those of GABA and pentobarbital.

Main Methods:

  • Studied [35S]TBPS binding to GABAA receptors in rat thalamus.
  • Induced absence seizures using gamma-hydroxybutyric acid (GHB).

Related Experiment Videos

  • Administered neuroactive steroids (alphaxalone, tetrahydrodeoxycorticosterone), GABA, and pentobarbital.

    • Main Results:

    • Neuroactive steroids increased [35S]TBPS binding in thalamic relay nuclei in control conditions.
    • Absence seizures significantly reduced the ability of steroids to increase [35S]TBPS binding.
    • GABA and pentobarbital modulation of binding remained largely unaffected during seizures.
    • The loss of steroid effect was not immediate but developed post-seizure onset and persisted with prolonged seizures.

    Conclusions:

    • Absence seizures induce a rapid loss of neuroactive steroid efficacy on GABAA receptors in thalamic relay nuclei.
    • This effect is specific to steroids and is dependent on the presence of seizures.
    • Findings suggest seizures alter GABAA receptor pharmacology in the thalamus.