Sodium valproate (400 mg/kg) significantly reduced exploratory head-dipping in mice, without significant reductions in locomotor activity or rearing. After 5 daily injections of sodium valproate (50 or 400 mg/kg) there was tolerance to the effects of a test dose of 400 mg/kg. Pretreatment for 5 days with chlordiazepoxide (5 mg/kg) did not change the effects of sodium valproate (400 mg/kg), but 5 days pretreatment with chlordiazepoxide (20 mg/kg) did not produce cross-tolerance. Sodium valproate (50 mg/kg) was without significant effect acutely, or after 5 days of pretreatment with sodium valproate (50 or 400 mg/kg) or chlordiazepoxide (5 or 20 mg/kg). Daily injections of the benzodiazepine antagonist, flumazenil (10 mg/kg), immediately after the daily injection of sodium valproate (400 mg/kg) or chlordiazepoxide (20 mg/kg) did not prevent the development of tolerance or cross-tolerance. This suggests that benzodiazepine receptors may not mediate these phenomena; possible roles of GABA and 5-HT are also discussed. © 1988.
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