Blockade of morphine analgesia by both pertussis and cholera toxins in the periaqueductal gray and locus coeruleus

Richard J. Bodnar, Dennis Paul, Marc Rosenblum, Linda Liu, Gavril W. Pasternak

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Rats demonstrating analgesia following microinjection of morphine into the periaqueductal gray (PAG) or locus coeruleus (LC) were injected with either pertussis toxin, cholera toxin or saline into the same brain region. Both pertussis and cholera toxin blocked the analgesic effect of morphine at both injection sites for up to 7 days after toxin treatment. These results indicate that morphine analgesia is a complex response involving systems dependent upon Gs as well as Gi of Go proteins.

Original languageEnglish
Pages (from-to)324-328
Number of pages5
JournalBrain Research
Volume529
Issue number1-2
DOIs
StatePublished - 8 Oct 1990
Externally publishedYes

Keywords

  • Cholera toxin
  • G-protein
  • Morphine analgesia
  • Pertussis toxin

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