The beta-carboline FG 7142 decreases conspecific aggression in male hooded rats. The purpose of this study was to examine the effects of pretreatment with Ro15-1788 or chlordiazepoxide (CDP) in this paradigm. The six groups (n = 8) were saline, FG 7142 (5 mg/kg, immediate, IP), CDP (5 mg/kg, -10 min, IP), CDP (5 mg/kg, -10 min) plus FG 7142 (5 mg/kg, immediate), Ro15-1788 (10 mg/kg, -10 min, IP), and Ro15-1788 (10 mg/kg, -10 min) plus FG 7142 (5 mg/kg, immediate). Following injection of the more aggressive member of a pair of isolation-housed rats, the pair was observed in a living cage over four 6-min trials interpolated over a 40 min session. In the first 20 min after the injection FG 7142 decreased aggression, decreased the pinning of the other animal, and increased avoiding behavior. These effects were the opposite of those seen in the Ro15-1788-injected rats and Ro15-1788 pretreatment reversed the effects of FG 7142. CDP alone caused prolonged aggressive behavior but as a pretreatment only partially reversed the effects of FG 7142.
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