Suppression by dynorphin A-(1-13) of the expression of opiate withdrawal and tolerance in mice

A. E. Takemori, Horace H. Loh, Nancy M. Lee

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73 Scopus citations

Abstract

Dynorphin A-(1-13) has been shown to suppress the expression of opiate withdrawal and tolerance dose dependently in morphine-dependent mice when administered i.v. The ED50 of naloxone to precipitate withdrawal jumping was increased by 1.5- and 7-fold when morphine-dependent mice were pretreated with 2.5 and 5.0 μmol/kg of dynorphin A-(1-13), respectively. When dynorphin A-(1-13) (5.0 μmol/kg, i.v.) was administered after the precipitation of withdrawal with naloxone, the ED50 of naloxone was still increased by over 2-fold. Also, the expression of tolerance which was estimated by noting the antinociceptive ED50 of morphine, was inhibited by over 70% with a dynorphin A-(1-13) dose of 2.5 μ mol/kg and completely suppressed by pretreatment with 5.0 μmol/kg of dynorphin A-(1-13) i.v. The mechanism by which dynorphin A-(1-13) produces these effects when given i.v. remains to be elucidated.

Original languageEnglish (US)
Pages (from-to)223-226
Number of pages4
JournalEuropean Journal of Pharmacology
Volume221
Issue number2-3
DOIs
StatePublished - Oct 20 1992

Keywords

  • Dynorphin A-(1-13)
  • Morphine
  • Opiate tolerance
  • Opiate withdrawal

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