U 43,465F: a benzodiazepine with antidepressant activity? Interaction with Ro 15-1788 and d,1-propranolol

U-43,465F (8-chloro-1-[2-(dimethylamino)ethyl]-6-phenyl-4H-s-triazolo [4,3-a][1,4]benzodiazepine p-toluene sulfonate) showed two fold activity at 32 mg/kg i.p.: antipunishment activity inhibited by the benzodiazepine receptor antagonist Ro 15-1788, and an antidepressant-like reversal of apomorphine-induced hypothermia, antagonized by the beta-adrenergic receptor blocker d,1-propranolol. U-43,465F hence produced effects not mediated by benzodiazepine receptors and these effects might be related to antidepressant activity.