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The synthetic delta-opioid receptor agonist BW373U86 (0.18-0.56 mg/kg s.c.) was studied in rhesus monkeys with a warm-water, tail-withdrawal assay, designed to detect bradykinin (0.1 microgram) and prostaglandin E2 (5-15.8 micrograms)-induced thermal allodynia. BW373U86 dose-dependently reversed bradykinin allodynia, but was ineffective against prostaglandin E2 allodynia. The BW373U86 dose-effect curve was shifted to the right by the delta-opioid receptor-selective antagonist naltrindole (1.0 mg/kg) but not by the mu-opioid receptor-selective antagonist quadazocine (0.1 mg/kg). The present findings add to the conditions in which delta-opioid receptor-mediated behavioral effects have been detected in primates, and suggest that delta-opioid agonists may be of therapeutic interest in the treatment of some types of hyperalgesic conditions.
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