RO5-4864 inhibits the binding of [35S]t-butylbicyclophosphorothionate to rat brain membranes

M. K. Ticku, R. Ramanjaneyulu

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


RO5-4864, a 1, 4-benzodiazepine, has recently been shown to possess anticonvulsant, convulsant and anxiogenic properties and to inhibit Ca++-calmodulin-stimulated membrane phosphorylation. RO5-4864 inhibited the binding of [35S]t-butylbicyclophosphorothionate (TBPT) to cerebral cortex, cerebellar and hippocampus membranes, with an IC50 value of ∼ 20 μM. TBPT binds apparently to the picrotoxinin site of the benzodiazepine-GABA receptor-ionophore complex and appears to be a site of action for several classes of convulsant, depressant and anxiolytic drugs that modulate GABAergic transmission. RO5-4864 inhibited [35S]TBPT binding in cerebral cortex, apparently competitively. Antagonists of GABA and central benzodiazepine sites did not interfere with the ability of RO5-4864 to inhibit [35S]TBPT binding. The properties of RO5-4864 to inhibit TBPT binding are similar to other convulsants and GABA antagonists (except bicuculline) which inhibit TBPT binding. These results suggest that RO5-4864 interacts with the TBPT binding sites of the oligomeric GABA receptor complex.

Original languageEnglish (US)
Pages (from-to)631-638
Number of pages8
JournalLife Sciences
Issue number7
StatePublished - Feb 13 1984

ASJC Scopus subject areas

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


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