PMID: 6403888Feb 1, 1983Paper

Regular and lasting neocortical spiking produced by systemic administration of a steroid derivative in the rat

Neuropharmacology
M S Myslobodsky, O Kofman

Abstract

The hypothesis was tested that sedation and stereotyped behaviour, developing in rats after the administration of the steroid derivative with gamma-aminobutyric acid (GABA) antagonistic properties, R 5135, are of an epileptiform nature. Electroencephalographic (EEG) and visual evoked potentials (VEP) were recorded and behaviour was observed over not less than 5-7 hr after subconvulsive doses of R 5135. Doses of 2-4 mg/kg of the compound produced quasi-rhythmic spikes resembling experimental focal epileptic discharges in all rats. This epileptiform activity was accompanied by behavioural sedation and somnolence, followed by a build-up of stereotyped behaviour and sporadic episodes of epileptiform motor activity, developing 1-2 hr after injection. The secondary components (SNW) of the visual evoked potentials were suppressed by R 5135 and the primary potential (N1) facilitated, virtually reducing the visual evoked potential to the form of an evoked spike. Pretreatment with the anticonvulsant GABAergic drugs gamma-acetylenic GABA (GAG) (100 mg/kg), sodium valproate (VPA) (400 mg/kg) and diazepam (5 mg/kg) suppressed the motor components of seizure activity, producing severe ataxia, but not the electrographic manifestation of seizu...Continue Reading

References

Sep 1, 1978·The British Journal of Psychiatry : the Journal of Mental Science·W E Haefely
Feb 1, 1980·Annals of Neurology·P A Schwartzkroin, A R Wyler
Apr 1, 1980·Epilepsia·M S Myslobodsky, E S Valenstein

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Citations

Feb 1, 1991·Pharmacology, Biochemistry, and Behavior·M S MyslobodskyJ Bar-Ziv
Sep 1, 1992·Brain Research Bulletin·O KofmanM S Myslobodsky
Oct 1, 1992·European Journal of Pharmacology·C Cadoni, K W Gee
Nov 15, 1987·Biochemical Pharmacology·M D Majewska
Mar 1, 1985·British Journal of Pharmacology·M A Simmonds, J P Turner
Jan 1, 1993·Neuroscience and Biobehavioral Reviews·M S Myslobodsky

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