GR89,696: A potent κ-opioid agonist with subtype selectivity in rhesus monkeys

Eduardo R. Butelman, M. C.Holden Ko, John R. Traynor, Jeffrey A. Vivian, Mary Jeanne Kreek, James H. Woods

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


GR89,696 is a synthetic κ-opioid receptor agonist, recently reported to have an agonist profile consistent with selectivity at the proposed "κ2" subtype. The present studies evaluated the effects of GR89,696 in vitro {i.e., in radioligand binding and [35S]guanosine-5′-O-(3-thio)triphosphate assays} and in vivo in rhesus monkeys, in assays used to study κ-opioid agonists (i.e., thermal antinociception, sedation and muscle relaxation, diuresis, and increases in serum prolactin levels, as well as ethylketocyclazocine and U69,593 discrimination). Furthermore, the sensitivity of GR89,696 to naltrexone and nor-binaltorphimine (nor-BNI) antagonism was compared with that of U50,488 and U69,593, ligands selective for the proposed "κ1" subtype. Overall, GR89,696 displayed the profile of a highly potent κ-opioid agonist, following parenteral administration in rhesus monkeys. GR89,696 was less sensitive than U50,488 and U69,593 to naltrexone or nor-BNI antagonism, consistent with an action through the proposed κ2 receptor subtype.

Original languageEnglish (US)
Pages (from-to)1049-1059
Number of pages11
JournalJournal of Pharmacology and Experimental Therapeutics
Issue number3
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology


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