Convulsant/depressant site of action at the allosteric benzodiazepine-gaba receptor-ionophore complex

Maharaj K. Ticku, Gabor Maksay

Research output: Contribution to journalReview articlepeer-review

132 Scopus citations


Several classes of centrally acting convulsant, depressant, anticonvulsant and anxiolytic drugs modulate GABAergic transmission. The post-synaptic receptor with which these drugs interact in an allosteric complex with distinct binding sites for GABA, benzodiazepines, picrotoxinin and related compounds. Convulsants which inhibit GABA transmission (except bicuculline) inhibit competitively the binding of dihydropicrotoxinin (DHP) or t-butylbicyclophosphorothionate (TBPT) to the picrotoxinin site and prevent the allosteric enhancing effect of depressant drugs on GABA and benzodiazepine binding. Depressant drugs give a mixed inhibition of TBPT binding. The possible topography of the picrotoxinin site and its relationship to convulsant/depressant drug action at the benzodiazepine-GABA receptor-ionophore complex is discussed.

Original languageEnglish (US)
Pages (from-to)2363-2375
Number of pages13
JournalLife Sciences
Issue number24
StatePublished - Dec 12 1983

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)


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