Effect of Isonicotinic Acid Hydrazide on Extracellular Amino Acids and Convulsions in the Rat: Reversal of Neurochemical and Behavioural Deficits by Sodium Valproate

Biggs, C.S., Pearce, B.R., Fowler, L.J. and Whitton, P.S. (2002) Effect of Isonicotinic Acid Hydrazide on Extracellular Amino Acids and Convulsions in the Rat: Reversal of Neurochemical and Behavioural Deficits by Sodium Valproate. Journal of Neurochemistry, 63 (6). pp. 2197-2201. 10.1046/j.1471-4159.1994.63062197.x.

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DOI: 10.1046/j.1471-4159.1994.63062197.x

Abstract

We have studied the effect of isonicotinic acid hydrazide (INH), a convulsant agent, on the extracellular levels of amino acids in the hippocampus, and the effect of sodium valproate (VPA) administration in INH-treated rats. INH (250 mg/kg) caused a rapid and sustained decrease in basal levels of GABA, and during this period convulsions of increasing severity were observed. Basal levels of glutamine, taurine, aspartate, and glutamate were unchanged by INH. When VPA was coadministered with INH, basal GABA levels were increased and no convulsions were observed. When transmitter release was evoked using 100 mMK+, the increase in dialysate GABA observed in INH-treated animals was less than that seen in controls and convulsions increased in frequency. K+-evoked release of glutamate and aspartate tended to be higher following INH treatment, and in the case of aspartate, this increase was significant. VPA reversed the changes in evoked release of glutamate and aspartate, and release of GABA was considerably greater than that seen in control or INH-treated rats. No drug effect on evoked changes in taurine or glutamine level was seen. These are the first data to show decreased extracellular GABA in conjunction with convulsions in freely moving animals in vivo

Item Type:Article
Uncontrolled Keywords:In vivo microdialysis;GABA;Sodium valproate;Isonicotinic acid hydrazide
Departments, units and centres:Department of Pharmacology > Department of Pharmacology
ID Code:3138
Journal or Publication Title:Journal of Neurochemistry
Deposited By:Library Staff
Deposited On:03 May 2012 11:24
Last Modified:03 May 2012 11:24

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