Naltrexone antagonizes the analgesic and immunosuppressive effects of morphine in mice

D. J.J. Carr, L. R. Gerak, C. P. France

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


A study was undertaken to investigate the relationship between morphine- induced analgesia and immunosuppression after acute administration. In male CD1 mice, morphine (10.0-100.0 mg/kg s.c.) produced a U-shaped immunosuppressive dose-effect curve on splenic natural killer (NK) activity. Morphine also induced dose-related analgesia, as measured by an increase in tail-flick latency during thermal application; these analgesic effects were antagonized by naltrexone (1.0-10.0 mg/kg). In addition, morphine-induced suppression of splenic NK activity was antagonized in a dose-dependent manner and, at one dose of naltrexone (10.0 mg/kg), splenic NK activity was augmented. To investigate further the relationship between naltrexone antagonism of morphine-induced analgesia and immunomodulation, single doses of morphine (10.0-100.0 mg/kg) were administered to mice pretreated with naltrexone (0.01-10.0 mg/kg) or saline. A dose of 10.0 mg/kg of morphine produced 35% of the maximal possible effect in the analgesia study and no immunosuppression, whereas a dose of 32.0 mg/kg produced a maximal analgesic effect and significant suppression of NK activity. Naltrexone blocked morphine-induced analgesia and immunosuppression in a dose-dependent fashion. Moreover, the combination of 1.0 mg/kg of naltrexone and 32.0 mg/kg of morphine elevated splenic NK activity. A large dose of morphine (100.0 mg/kg) elicited full analgesia and had no effect on splenic NK activity in saline- or naltrexone-pretreated mice. Collectively, these results support the view that, in mice, morphine-induced analgesia and immunosuppression are mediated through a common opioid receptor type.

Original languageEnglish (US)
Pages (from-to)693-698
Number of pages6
JournalJournal of Pharmacology and Experimental Therapeutics
Issue number2
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology


Dive into the research topics of 'Naltrexone antagonizes the analgesic and immunosuppressive effects of morphine in mice'. Together they form a unique fingerprint.

Cite this