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- C C Chien and G W Pasternak.
- Cotzias Laboratory of Neuro-Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
- Neurosci. Lett. 1995 May 5;190(2):137-9.
AbstractIn mice, activation of sigma1 receptors antagonizes opioid analgesia. Sigma antagonists potentiate opioid analgesia, implying that the anti-opioid sigma system is tonically active. Co-administration of haloperidol with the mu opioid morphine, the kappa 1 analgesic U50,488H or the kappa 3 agonist naloxone benzoylhydrazone enhances the analgesic activity of all agents. The effect results from sigma receptor blockade since (-)sulpiride, a selective D2 antagonist which does not block sigma receptors, is inactive.
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