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The threshold for pentylenetetrazol (PTZ)-induced clonic seizures is below control levels 15 min after administration of apomorphine (APO) but above them 60 min after APO administration. Pretreatment with ascorbic acid (10 mg/kg) or the presence of ascorbic acid in the APO solution (1 mg/ml)
The effects of levodopa, apomorphine and 3,4-dihydroxyphenylserine (DOPS) on tonic seizures elicited by strychnine were investigated in mice. Levodopa (6.25-100 mg/kg), apomorphine (0.2-0.8 mg/kg) and FLA-63 (12.5 mg/kg) profoundly delayed the onset and reduced the incidence of strychnine seizures.
Based on previous work examining the effects of dextroamphetamine on pentylenetetrazol (PTZ)-induced clonic seizure threshold, the objective of the present study was to determine the effects of two other dopamine agonists, apomorphine (AP) and piribedil, on PTZ seizures. TD50 and LD50 values for
Audiogenic seizures in DBA/2 mice have been studied after administration of drugs believed to act as dopamine agonists. Apomorphine at 0.4 mg/kg delays all phases of the response, the tonic phase is absent after 2.0 mg/kg; the clonic phase is abolished by 10 mg/kg. Ergocornine (0.5-8.0 mg/kg)
In order to study the role of dopamine (DA) in the regulation of seizure mechanisms in man, a non-emetic dose of apomorphine, a direct stimulant of DA receptors, was administered to eight patients effected by different types of epilepsy. The EEG changes induced by apomorphine administration in
The influence of dopamine, levodopa and apomorphine on maximal electroconvulsive seizure was studied in young chicks, adult cocks and rats. The susceptibility of chicks to maximal electroshock seizure increased with age between 1 to 7 days. Low to moderate doses of dopamine (12.5-150 mg/kg, i.p.),
The ability of drugs, selective for dopamine D1 and D2 receptors, to influence the production of motor seizures was studied in mice and rats. Mice, which had been injected with reserpine (5 mg/kg) to deplete stores of monoamines in brain, could be made to convulse 24 hr later by injecting the D1
The purpose of this paper was to study the relationship between different neurotransmitter systems and seizure susceptibility in Mongolian gerbils with genetically determined epilepsy. In these animals, generalized tonic-clonic seizures were induced by stimulation with a blast of compressed air. A
In this study, the effects of MK-801 and selective dopaminergic agents on electrically-induced convulsions in mice were examined. MK-801 (0.004-0.1 mg/kg, ip) showed significant and dose-dependent anticonvulsive effects, and the anticonvulsive effects of MK-801 (0.02 mg/kg, ip) were not antagonized
The discrete localization of D3 receptors in the nucleus accumbens and subjacent islands of Calleja bears a close resemblance to the dopamine-sensitive anticonvulsant site in the anteroventral striatum. To determine if these D3 receptors were capable of attenuating limbic motor seizures induced by
BACKGROUND
Clinical research shows that the antidepressant and cognitive adverse effects of electroconvulsive therapy are both dependent on the administered electrical stimulus intensity (dose); however, dose-dependent neurotransmitter system changes in the brain, which might underlie the
In electroshock test apomorphine appeared without effect, D, L-amphetamine and L-DOPA (in a high dose) elevated the convulsive threshold, while amantadine decreased it. Among investigated dopamine (DA) receptor blockers spiperone, pimozide and fluphenazine lowered the threshold, haloperidol being
Administration of reserpine, trifluperidol, chlorpromazine, haloperidol, spiroperidol, and thioproperazine to adult mice shortened the latency and increased the number of animals with clonic seizures induced by 1-kynurenine sulfate or its metabolite quinolinic acid. Haloperidol dose-dependently