Chemistry:Noribogaine

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Short description: Principal psychoactive metabolite of the oneirogen ibogaine
Noribogaine
Noribogaine.svg
Noribogaine 3D BS.png
Clinical data
Other names12-Hydroxyibogamine; Ibogamin-12-ol; O-desmethylibogaine; (-)-Noribogaine;
Legal status
Legal status
  • AU: S4 (Prescription only)
  • US: Unscheduled (but still a Schedule I analogue due to being a main metabolite of C-I ibogaine)
Identifiers
CAS Number
PubChem CID
ChemSpider
UNII
Chemical and physical data
FormulaC19H24N2O
Molar mass296.414 g·mol−1
3D model (JSmol)
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Noribogaine (actually O-desmethylibogaine), or 12-hydroxyibogamine, is the principal psychoactive metabolite of the oneirogen ibogaine. It is thought to be involved in the antiaddictive effects of ibogaine-containing plant extracts, such as Tabernanthe iboga.[1][2][3][4]

Pharmacology

Noribogaine is a potent serotonin reuptake inhibitor,[5] but does not affect the reuptake of dopamine.[6] Unlike ibogaine, noribogaine does not bind to the sigma-2 receptor.[7][8] Similarly to ibogaine, noribogaine acts as a weak NMDA receptor antagonist and binds to opioid receptors.[9] It has greater affinity for each of the opioid receptors than does ibogaine.[10]

Noribogaine is a hERG inhibitor and appears at least as potent as ibogaine.[11] The inhibition of the hERG potassium channel delays the repolarization of cardiac action potentials, resulting in QT interval prolongation and, subsequently, in arrhythmias and sudden cardiac arrest.[12]

κ-Opioid receptor

Noribogaine has been determined to act as a biased agonist of the κ-opioid receptor (KOR).[13] It activates the G protein (GDP-GTP exchange) signaling pathway with 75% the efficacy of dynorphin A (EC50 = 9 μM), but it is only 12% as efficacious at activating the β-arrestin pathway.[13] Moreover, due to its very low efficacy on the β-arrestin pathway, noribogaine blocked dynorphin A activation of the pathway (IC50 = 1 μM) and hence functioned as an antagonist of it.[13]

The β-arrestin pathway is thought to be responsible for the dysphoric and aversive effects of KOR activation,[14] and its lack of activation by noribogaine may be the reason for the lack of dysphoric effects of the drug.[13] This biased agonist/antagonist action of noribogaine at the KOR is unique to it relative to other iboga alkaloids and related compounds such as ibogaine and 18-methoxycoronaridine (18-MC).[13] Moreover, it has been hypothesized that it may give noribogaine unique properties such that it may have the analgesic and antiaddictive effects of KOR agonists without the anxiogenic, dysphoric, or anhedonic effects that are typical of them.[13]

See also

References

  1. ↑ "Oral noribogaine shows high brain uptake and anti-withdrawal effects not associated with place preference in rodents". J. Psychopharmacol. (Oxford) 30 (7): 688–97. 2016. doi:10.1177/0269881116641331. PMID 27044509. 
  2. ↑ "Mechanisms of antiaddictive actions of ibogaine". Annals of the New York Academy of Sciences 844 (1): 214–26. May 1998. doi:10.1111/j.1749-6632.1998.tb08237.x. PMID 9668680. Bibcode: 1998NYASA.844..214G. 
  3. ↑ "Comparative neuropharmacology of ibogaine and its O-desmethyl metabolite, noribogaine". The Alkaloids: Chemistry and Biology 56: 79–113. 2001. doi:10.1016/S0099-9598(01)56009-5. PMID 11705118. 
  4. ↑ "Acute toxicity of ibogaine and noribogaine". Medicina 44 (12): 984–8. 2008. doi:10.3390/medicina44120123. PMID 19142057. 
  5. ↑ Max M. Houck (26 January 2015). Forensic Chemistry. Elsevier Science. pp. 164–. ISBN 978-0-12-800624-5. https://books.google.com/books?id=POpDBAAAQBAJ&pg=PA164. 
  6. ↑ "In vivo neurobiological effects of ibogaine and its O-desmethyl metabolite, 12-hydroxyibogamine (noribogaine), in rats". The Journal of Pharmacology and Experimental Therapeutics 297 (2): 531–539. May 2001. PMID 11303040. http://jpet.aspetjournals.org/content/297/2/531. 
  7. ↑ Paul Gahlinger (30 December 2003). Illegal Drugs. Penguin Publishing Group. pp. 304–. ISBN 978-1-4406-5024-6. https://books.google.com/books?id=kPszgXPVQAsC&pg=PA304. 
  8. ↑ Ibogaine: Proceedings from the First International Conference. Gulf Professional Publishing. 2001. pp. 107–. ISBN 978-0-12-053206-3. https://books.google.com/books?id=jPa5cuAFW14C&pg=PA107. 
  9. ↑ Donald G. Barceloux (20 March 2012). Medical Toxicology of Drug Abuse: Synthesized Chemicals and Psychoactive Plants. John Wiley & Sons. pp. 869–. ISBN 978-0-471-72760-6. https://books.google.com/books?id=OWFiVaDZnkQC&pg=PA869. 
  10. ↑ "Radioligand-binding study of noribogaine, a likely metabolite of ibogaine". Brain Research 675 (1–2): 342–344. March 1995. doi:10.1016/0006-8993(95)00123-8. PMID 7796150. 
  11. ↑ "hERG Blockade by Iboga Alkaloids". Cardiovasc. Toxicol. 16 (1): 14–22. 2016. doi:10.1007/s12012-015-9311-5. PMID 25636206. https://cdr.lib.unc.edu/downloads/qr46r634b. 
  12. ↑ "How toxic is ibogaine?". Clin Toxicol 54 (4): 297–302. 2016. doi:10.3109/15563650.2016.1138226. PMID 26807959. 
  13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 "Noribogaine is a G-protein biased κ-opioid receptor agonist". Neuropharmacology 99: 675–88. 2015. doi:10.1016/j.neuropharm.2015.08.032. PMID 26302653. 
  14. ↑ "Kappa Opioid Receptor-Induced Aversion Requires p38 MAPK Activation in VTA Dopamine Neurons". J. Neurosci. 35 (37): 12917–31. 2015. doi:10.1523/JNEUROSCI.2444-15.2015. PMID 26377476. 



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