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Hypothermic effect of D-Ala-deltorphin II, a selective delta opioid receptor agonist.

The natural heptapeptide D-Ala-deltorphin II, the most selective agonist for delta-receptors currently available, was used to study the role of brain delta opioid receptors in the control of body temperature. In rats placed in a cold ambient temperature (4 degrees C), intracerebroventricular injections of D-Ala-deltorphin II produced a significant hypothermia. In animals at an ambient temperature of 22 degrees C, only the highest dose employed induced a slight fall in body temperature. At a warm temperature (34 degrees C), D-Ala-deltorphin II induced no significant changes in body temperature. D-Ala-deltorphin II-induced hypothermia, unaffected by naloxone, was significantly reduced by the selective delta receptor antagonist naltrindole. These findings indicate that D-Ala-deltorphin II produces its hypothermic effects at a supraspinal delta receptor, and support the involvement of delta receptors in central control of body temperature.