Article date: 1990/4/23
PubMed ID: 2162707
Journal name: Brain research (ISSN: 0006-8993)
The effects of excitatory amino acid antagonists on convulsions induced by intracerebroventricular (i.c.v.) or systemic (s.c.) administration of the gamma-aminobutyric acidA (GABAA) antagonist bicuculline (BIC) were tested in mice. 3-[+/-)-2-Carboxypiperazin-4-yl)-propyl-1-phosphonate (CPP), 2-amino-7-phosphonoheptanoate (AP7) and (+)-5-methyl-10,11-dihydro-5H-dibenzo(a,d)cycloheptan-5,10-imine maleate (MK-801) were used as representatives of N-methyl-D-aspartate (NMDA) antagonists. gamma-D-Glutamylaminomethylsulphonate (gamma-D-GAMS) typified a preferential kainate (KA) antagonist, 6-cyano-7-nitro-quinoxaline-2,3-dione (CNQX) represented a preferential quisqualate (QA) antagonist, and kynurenic acid (KYNA) was used as a mixed NMDA/KA antagonist. Bicuculline methiodide (BMI) induced clonic convulsions following i.c.v. administration with a CD50 of 0.183 nmol (range 0.164-0.204). The excitatory amino acid antagonists blocked clonic seizures induced by BMI in the dose of 0.224 nmol (approximately CD97) when coinjected into the lateral ventricle. CPP (ED50 0.0075 nmol) was the most potent anticonvulsant and was followed by AP7 (0.182 nmol), MK-801 (0.22 nmol), gamma-D-GAMS (0.4 nmol), KYNA (1.7 nmol) and CNQX (5.17 nmol). Muscimol (MSC), the GABAA agonist, blocked BMI-induced seizures with an ED50 of 0.25 nmol. Systemic (s.c.) administration of BIC induced in mice generalized seizures with a CD50 of 2.2 mg/kg (range 1.9-2.5) for clonus and CD50 of 2.4 mg/kg (range 2.2-2.7) for tonus.2+ the pathogenesis of seizures triggered by bicuculline in mice.
Author List: Turski W A, Urbanska E, Dziki M, Parada-Turska J, Ikonomidou C
Publication Types: Journal Article; Research Support, Non-U.S. Gov't
Substances mentioned in the article: Dibenzocycloheptenes; Pipecolic Acids; Piperazines; Piperidines; Receptors, Amino Acid; Receptors, Cell Surface; Muscimol; selfotel; Dizocilpine Maleate; 3-(2-carboxypiperazin-4-yl)propyl-1-phosphonic acid; Bicuculline;
Mesh terms: Animals; Bicuculline; Dibenzocycloheptenes/therapeutic use; Dizocilpine Maleate; Dose-Response Relationship, Drug; Male; Mice; Muscimol/therapeutic use; Pipecolic Acids; Piperazines/therapeutic use; Piperidines/therapeutic use; Receptors, Amino Acid; Receptors, Cell Surface/antagonists & inhibitors; Seizures/chemically induced;