The effect of losigamone (AO-33) on electrical activity and excitatory amino acid release in mouse cortical slices.

Abstract:

:1. Losigamone is a novel anticonvulsant the mechanism of action of which is not known. This study investigated the effect of losigamone on spontaneous, NMDA- and AMPA-induced depolarizations in the cortical wedge preparation of the DBA/2 mouse (which are susceptible to sound-induced seizures) and on endogenous amino acid release from BALB/c mouse cortical slices. 2. Cortical wedges exhibit spontaneous depolarizations in magnesium-free medium and losigamone was effective in significantly reducing these spontaneous depolarizations at concentrations of 100 microM and above. 3. NMDA-induced depolarizations were significantly reduced by losigamone at concentrations of 25 microM and above. Losigamone had no effect on AMPA-induced depolarizations. 4. Veratridine (20 microM) and potassium (60 mM) were used to stimulate the release of amino acids from mouse cortex. Veratridine-stimulated release of glutamate was significantly reduced by losigamone at concentrations of 100 microM and above, while potassium-stimulated release was significantly reduced by losigamone at 200 microM. 5. NMDA antagonism and inhibition of excitatory amino acid release may contribute to the anticonvulsant effect of losigamone.

journal_name

Br J Pharmacol

authors

Srinivasan J,Richens A,Davies JA

doi

10.1038/sj.bjp.0701539

subject

Has Abstract

pub_date

1997-12-01 00:00:00

pages

1490-4

issue

7

eissn

0007-1188

issn

1476-5381

journal_volume

122

pub_type

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