Convulsant actions of the neurosteroid pregnenolone sulfate in mice

Tushar G. Kokate, Kyungho N. Juhng, R. Duncan Kirkby, Jose Llamas, Shun Ichi Yamaguchi, Michael A Rogawski

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48 Scopus citations

Abstract

Pregnenolone sulfate (PS) is an endogenous neurosteroid known to antagonize GABA(A) receptor-mediated inhibitory responses and potentiate NMDA receptor-mediated excitatory responses in vitro. To assess the actions of the steroid as a modulator of seizure susceptibility in vivo, PS (30-300 nmol) was administered intracerebroventricularly in mice. At doses of 50 to 150 nmol, PS elicited seizures characterized by head jerks, rearing and falling, severe forelimb and hindlimb clonus, opisthotonos and explosive running. The seizures increased in severity and frequency with time and eventually progressed to status epilepticus, tonic hindlimb extension and death. The doses producing convulsions in 50% (CD50) and 97% (CD97) of animals were 92 and 205 nmol, respectively. A subconvulsant dose of PS (50 nmol) significantly increased the convulsant potencies of systemically administered pentylenetetrazol (30-50 mg/kg) and NMDA (50-100 mg/kg). Systemically administered PS at doses as high as 100 mg/kg failed to induce seizures or alter the convulsant potencies of pentylenetetrazol and NMDA. Protection against PS (205 nmol)-induced seizures and lethality was conferred by the GABA(A) receptor positive allosteric modulators clonazepam and allopregnanolone, and by the NMDA receptor antagonists dizocilpine and (R)- CPP. The overall pharmacological profile suggests that the convulsant actions of PS are mediated predominantly via its effects on GABA(A) receptors, and also possibly by effects on NMDA receptors.

Original languageEnglish (US)
Pages (from-to)119-124
Number of pages6
JournalBrain Research
Volume831
Issue number1-2
DOIs
StatePublished - Jun 12 1999
Externally publishedYes

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Keywords

  • GABA(A) receptor
  • Neurosteroid
  • NMDA receptor
  • Pregnenolone sulfate
  • Seizure

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Kokate, T. G., Juhng, K. N., Kirkby, R. D., Llamas, J., Yamaguchi, S. I., & Rogawski, M. A. (1999). Convulsant actions of the neurosteroid pregnenolone sulfate in mice. Brain Research, 831(1-2), 119-124. https://doi.org/10.1016/S0006-8993(99)01287-1