Tolerance to morphine analgesia: decreased multiplicative interaction between spinal and supraspinal sites

Sandra C. Roerig, Sandra M. O'Brien, James M. Fujimoto, George L. Wilcox

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Mice injected with morphine at both a supraspinal (intracerebroventricular)and a spinal (intrathecal) site showed a multiplicative interaction between sites for the tail-flick analgesic response. In morphine pellet-implanted mice, the decrease in this interaction was the source of tolerance developed to subcutaneous morphine whereas the separate sites showed no tolerance. During morphine withdrawal (after removal of the morphine pellet) synergism between sites returned but the separate sites showed development of tolerance.

Original languageEnglish (US)
Pages (from-to)360-363
Number of pages4
JournalBrain Research
Volume308
Issue number2
DOIs
StatePublished - Aug 13 1984

Keywords

  • morphine-analgesic tolerance
  • spinal/supraspinal multiplicity

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