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  • Title: Facilitation of memory retrieval by pretest morphine mediated by mu but not delta and kappa opioid receptors.
    Author: Shiigi Y, Takahashi M, Kaneto H.
    Journal: Psychopharmacology (Berl); 1990; 102(3):329-32. PubMed ID: 2174567.
    Abstract:
    Mice were trained to avoid electric shock (0.6 mA) in a step-through type passive avoidance learning task, retention being measured 24 h after the training trial. Morphine 10 mg/kg administered 30 min before the test trial (pretest) facilitated memory retrieval, and the effect was completely antagonized by 1 mg/kg naloxone, a selective mu-opioid receptor antagonist. On the other hand, pretest administration of 0.01-10 mg/kg DTLET, a selective delta-opioid receptor agonist, did not produce the same effect as morphine. Nor-binaltorphimine, a kappa-opioid receptor antagonist, did not antagonize the effect of pretest morphine, at doses of 1 and 2 mg/kg. These results suggest that the facilitation of memory retrieval by pretest morphine is mediated through mu- but not delta- or kappa-opioid receptors.
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