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2,3-Butanedione monoxime protects mice against the convulsant effect of picrotoxin by facilitating GABA-activated currents.

Abstract：

:While adult mice receiving picrotoxin (PTX) alone responded with clonic and tonic-clonic seizures, this response was greatly suppressed for mice simultaneously injected with 2,3-butanedione monoxime (BDM). For example, 60% and 10% of the mice convulsed when injected (i.p.) with 3.0 mg/kg PTX alone or PTX plus 205 mg/kg of BDM, respectively. In contrast, a non-oxime analogue of BDM, 2,3-butanedione (BTD), did not have this anticonvulsant effect. In order to explore the basis for the anticonvulsant effect of BDM, we recorded GABA-activated currents (IGABA) of frontal cortical as well as ventromedial hypothalamic neurons before, during and after exposure to this oxime. BDM had a biphasic effect on IGABA. That is, high concentrations (100 microM-40 mM) decreased and lower concentrations (0.01 microM-0.001 microM) potentiated IGABA; these effects of BDM reversed upon washout of the oxime. In contrast, BTD had no effect on IGABA. Finally, when 0.001 microM BDM, 10-30 microM PTX and GABA were co-applied the inhibitory effect of the toxin on IGABA was markedly suppressed. These data suggest that the anticonvulsant effect of oximes involves facilitation of the inhibitory action of GABA.

journal_name

Brain Res

journal_title

Brain research

authors

Brightman T,Ye JH,Ortiz-Jimenez E,Flynn EJ,Wu WH,McArdle JJ

doi

10.1016/0006-8993(95)00175-p

subject

Has Abstract

pub_date

1995-04-24 00:00:00

pages

110-6

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(95)00175-P

journal_volume

678

pub_type

杂志文章

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