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Benzodiazepine antagonism by harmane and other beta-carbolines in vitro and in vivo.
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Harmane and other related beta-carbolines are putative endogenous ligands of the benzodiazepine receptor. Since the compounds are potent convulsants they may have agonist activities at the benzodiazepine receptor while the benzodiazepines may be antagonists. This hypothesis was proved by comparing
Effect of harmane on the convulsive threshold in epilepsy models in mice.
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The study investigated the activity of harmane on maximal electroshock seizures (MES) and seizures induced by pentilentetrazole (PTZ) in mice. Initial studies established convulsive current 50 (CC(50)) values or MES and effective dose 50 (ED(50)) for PTZ to produce seizures. Harmane (2.5, 5.0, or 10
Binding of beta-carbolines and caffeine on benzodiazepine receptors: correlations to convulsions and tremor.
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Compounds from both the beta-carboline (BC) and xanthine groups have been suggested to be the natural ligands for benzodiazepine (BZ) receptors. In this study we examined the effects of several BC's and caffeine, 1,3,7-trimethylxanthine, on the binding of 3H-flunitrazepam (3H-FZ) and
Tofizopam enhances the action of diazepam against tremor and convulsions.
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Tofizopam, an anxiolytic 3,4-benzodiazepine, increases the affinity of benzodiazepine receptors for 1,4-benzodiazepines. In this study we investigated whether this increased affinity of the receptors alters the sensitivity of mice to tremor and to convulsions. Convulsions induced by harmane were not
Involvement of dopamine D1/D2 receptors on harmane-induced amnesia in the step-down passive avoidance test.
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Ingestion of harmane and other alkaloids derived from plant Peganum harmala has been shown to elicit profound behavioural and toxic effects in humans, including hallucinations, excitation, feelings of elation, and euphoria. These alkaloids in the high doses can cause a toxic syndrome characterized
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