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The alpha 2-antagonist, yohimbine has been shown to dose-dependently induce clonic seizures in mice. The convulsant effects of yohimbine are not due to alpha 2-antagonism, as other alpha 2-antagonists, such as rauwolscine and idazoxan, did not produce seizures at doses up to 100 mg/kg. Since
10 mg/kg yohimbine significantly reduced the latency to the first convulsion of rats treated with 90 mg/kg pentylenetetrazol (PTZ) and markedly increased the number of animals showing generalized strong clonic seizures and dying within 1 h. All the animals treated with 20 mg/kg yohimbine and PTZ
Clonidine in high doses (0.5,1.0 mg/kg) significantly increased the latency for audiogenic seizures (AGS) in rats and reduced seizure severity. At a dose (0.05 mg/kg) which acts more specifically on presynaptic alpha 2-receptors, clonidine did not affect seizure latency, but showed a slight
The role of the GABA system in producing a pentylenetetrazol-like interoceptive discriminative stimulus during withdrawal from diazepam was investigated in rats by determining the sensitivity of this system to GABAergic drugs before and after chronic treatment with diazepam. Food-restricted rats
The present study evaluated the effects of Angiotensin (Ang) Ang II and Ang III on pentylenetrazol (PTZ) seizure threshold in non-stressed and stressed mice as well as the possible participation of noradrenergic (NA) mechanism in their effects. While intracerebroventricular (i.c.v.) administered Ang
Adjunct α2-adrenoceptor antagonism is a potential strategy to accelerate the behavioral effects of antidepressants. Co-administration of the α2-adrenoceptor antagonist yohimbine hastens the behavioral and neurogenic effects of the antidepressant imipramine. We examined the transcriptional targets of
The threshold of seizures induced by electroconvulsive shock (ECS) was determined in mice and the effects of alpha 2-adrenoceptor antagonists (yohimbine, rauwolscine, idazoxan), alpha 2-adrenoceptor agonists (clonidine, B-HT 920), serotonin antagonists (methysergide, metergoline) and a serotonin
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
We studied the role of the noradrenergic system in the seizures of epileptic El mice. To this end, the anticonvulsant activity of adrenergic drugs was tested with a scoring method, and the binding of [3H]dihydroalprenolol, [3H]prazosin and [3H]yohimbine was evaluated in whole brains and various
Cannabinoid system plays a pivotal role in the seizure threshold modulation which is mainly mediated through activation of the cannabinoid CB₁ receptor. There is also several evidence of interaction between cannabinoid system and α₂-adrenoceptors in different paradigms. Using model of clonic seizure
The preferential alpha 2-noradrenergic agonist clonidine dose-relatedly increased the onset of seizures and mortality times, and decreased severity in rats treated with D,L-allylglycine. These effects were reduced by a dose (2.5 mg/kg) of the preferential alpha 2-antagonist yohimbine, which was
The influence of various substances modulating the activity of central noradrenergic, serotonergic or dopaminergic neurotransmission systems on the anticonvulsant effectiveness of phenobarbital (phenytoin, carbamazepine) was investigated in mice using the maximal electroshock seizure test (MES). The
The mechanisms involved in inhibitory effects of isofloxythepin, a newly synthesized dibenzothiepin neuroleptic, on post-decapitation convulsions were studied in rats. Isofloxythepin (0.05-2.0 mg/kg s.c.) inhibited post-decapitation convulsions in a dose-dependent manner as shown by the decrease in