Diazepam and endorphin independently inhibit ultrasonic distress calls in rats.

Abstract

Ultrasonic distress calls elicited in male rats by footshock under inescapable conditions were suppressed by diazepam. The suppression was blocked by pretreatment with Ro15-1788 or CGS8216, selective benzodiazepine receptor antagonists, while an opiate antagonist naloxone failed to modify the effect of diazepam. In contrast, naloxone antagonized but Ro15… (More)

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