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Systematic (IUPAC) name
PubChem CID 6604846
ChemSpider 21259050 N
Synonyms 5'-Guanidinonaltrindole, GNTI
Chemical data
Formula C27H29N5O3
Molar mass 471.550 g/mol
 NYesY (what is this?)  (verify)

5'-Guanidinonaltrindole (5'-GNTI) is an opioid antagonist used in scientific research which is highly selective for the κ opioid receptor. It is 5x more potent and 500 times more selective than the commonly used κ-opioid antagonist norbinaltorphimine.[1] It has a slow onset and long duration of action,[2][3] and produces antidepressant effects in animal studies.[4] It also increases allodynia by interfering with the action of the κ-opioid peptide dynorphin.[5]

In addition to activity at the KOR, 5'-GNTI has been found to act as a positive allosteric modulator of the α1A-adrenergic receptor (EC50 = 41 nM), and this may contribute to its "severe transient effects".[6]

See also[edit]


  1. ^ Jones, RM; Portoghese, PS (2000). "5'-Guanidinonaltrindole, a highly selective and potent kappa-opioid receptor antagonist". European Journal of Pharmacology. 396 (1): 49–52. doi:10.1016/S0014-2999(00)00208-9. PMID 10822054. 
  2. ^ Negus, SS; Mello, NK; Linsenmayer, DC; Jones, RM; Portoghese, PS (2002). "Kappa opioid antagonist effects of the novel kappa antagonist 5'-guanidinonaltrindole (GNTI) in an assay of schedule-controlled behavior in rhesus monkeys". Psychopharmacology. 163 (3–4): 412–9. doi:10.1007/s00213-002-1038-x. PMID 12373442. 
  3. ^ Bruchas, MR; Yang, T; Schreiber, S; Defino, M; Kwan, SC; Li, S; Chavkin, C (2007). "Long-acting κ Opioid Antagonists Disrupt Receptor Signaling and Produce Noncompetitive Effects by Activating c-Jun N-terminal Kinase". The Journal of Biological Chemistry. 282 (41): 29803–11. doi:10.1074/jbc.M705540200. PMC 2096775free to read. PMID 17702750. 
  4. ^ Mague, SD; Pliakas, AM; Todtenkopf, MS; Tomasiewicz, HC; Zhang, Y; Stevens Jr, WC; Jones, RM; Portoghese, PS; Carlezon Jr, WA (2003). "Antidepressant-like effects of kappa-opioid receptor antagonists in the forced swim test in rats". The Journal of Pharmacology and Experimental Therapeutics. 305 (1): 323–30. doi:10.1124/jpet.102.046433. PMID 12649385. 
  5. ^ Obara, I; Mika, J; Schafer, MK; Przewlocka, B (2003). "Antagonists of the κ-opioid receptor enhance allodynia in rats and mice after sciatic nerve ligation". British Journal of Pharmacology. 140 (3): 538–46. doi:10.1038/sj.bjp.0705427. PMC 1574046free to read. PMID 12970097. 
  6. ^ Porter, James; Munro, Thomas A.; Huang, Xi-Ping; Inglese, Carmela; Perrone, Maria Grazia; Van't Veer, Ashlee; Carroll, F. Ivy; Béguin, Cécile; Carlezon, William A.; Colabufo, Nicola A.; Cohen, Bruce M.; Roth, Bryan L. (2013). "Selective κ Opioid Antagonists nor-BNI, GNTI and JDTic Have Low Affinities for Non-Opioid Receptors and Transporters". PLoS ONE. 8 (8): e70701. doi:10.1371/journal.pone.0070701. ISSN 1932-6203.