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  • Title: Effects of mu-, delta- and kappa-opioid receptor agonists on methamphetamine-induced self-injurious behavior in mice.
    Author: Mori T, Ito S, Kita T, Narita M, Suzuki T, Sawaguchi T.
    Journal: Eur J Pharmacol; 2006 Feb 17; 532(1-2):81-7. PubMed ID: 16464448.
    Abstract:
    Opioid receptor agonists can differentially modify the behavioral effects of direct/indirect dopamine receptor agonists, such as methamphetamine, cocaine and apomorphine. However, the effects of opioid receptor agonists on high-dose methamphetamine-induced behavior have not yet been clarified. Therefore, the present study was undertaken to investigate the effects of mu (morphine)-, delta (SNC80)- and kappa (U50,488H)-opioid receptor agonists on methamphetamine-induced self-injurious behavior and locomotor activity in mice. Methamphetamine (20 mg/kg) induced severe self-injurious behavior. In a combination test, some opioid receptor agonists significantly attenuated methamphetamine-induced self-injurious behavior, with potencies in the order morphine>buprenorphine (mu-opioid and kappa-opioid receptor agonist/antagonist) >U50,488H, as maximum effects. These results suggest that the stimulation of mu- and kappa-opioid receptors plays an inhibitory role in high-dose methamphetamine-induced stereotypic self-injurious behavior in mice, without affecting locomotor activity.
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