5'-Guanidinonaltrindole, a highly selective and potent κ-opioid receptor antagonist

Robert M. Jones, Philip S. Portoghese

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


5'-Guanidinonaltrindole (GNTI) possesses 5-fold greater opioid antagonist potency (K(e)=0.04 nM) and an order of magnitude greater selectivity (selectivity ratios >500) than the prototypical κ-opioid receptor antagonist, norbinaltorphimine, in smooth muscle preparations. Binding and functional studies conducted on cloned human opioid receptors expressed in Chinese hamster ovarian (CHO) cells afforded pA2 values that were comparable to the smooth muscle data. In view of the high selectivity and potency of GNTI, it is a potentially valuable pharmacological tool for opioid research. Copyright (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)49-52
Number of pages4
JournalEuropean Journal of Pharmacology
Issue number1
StatePublished - May 12 2000


  • Binding
  • Norbinaltorphimine
  • κ-Opioid receptor

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