The effects of benzodiazepine receptor agonist, diazepam, and inverse agonist, FG 7142, were examined. Strong antagonism between FG 7142 (10 mg/kg) and diazepam (1 mg/kg) activity was revealed in the open field test. On the other hand, both FG 7142 and diazepam inhibited isolation-induced intraspecies aggressive behaviour of rats. FG 7142 also reduced interspecies aggression of mouse-killing rats. The findings suggest that both diazepam and FG 7142 have antiaggressive properties in the isolation-induced aggression model, which are mediated by benzodiazepine receptors of the central nervous system.
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