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Int. J. Mol. Sci. 2019, 20(3), 488; https://doi.org/10.3390/ijms20030488

Morphing of Ibogaine: A Successful Attempt into the Search for Sigma-2 Receptor Ligands

1
Department of Drug Sciences, University of Catania, V.le A. Doria, 95125 Catania, Italy
2
Consorzio Interuniversitario Nazionale di ricerca in Metodologie e Processi Innovativi di Sintesi (C.I.N.M.P.S.), Via E. Orabona, 4, 70125 Bari, Italy
*
Authors to whom correspondence should be addressed.
Received: 31 December 2018 / Revised: 18 January 2019 / Accepted: 21 January 2019 / Published: 23 January 2019
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Abstract

Ibogaine is a psychoactive indole alkaloid with high affinity for several targets including the σ2 receptor. Indeed, extensive data support the involvement of the σ2 receptor in neurological disorders, including Alzheimer’s disease, schizophrenia, alcohol abuse and pain. Due to its serious side effects which prevent ibogaine from potential clinical applications, novel ibogaine derivatives endowed with improved σ2 receptor affinity may be particularly beneficial. With the purpose to facilitate the investigation of iboga alkaloid derivatives which may serve as templates for the design of selective σ2 receptor ligands, here we report a deconstruction study on the ibogaine tricyclic moiety and a successive scaffold-hopping of the indole counterpart. A 3D-QSAR model has been applied to predict the σ2 pKi values of the new compounds, whereas a molecular docking study conducted upon the σ2 receptor built by homology modeling was used to further validate the best-scored molecules. We eventually evaluated pinoline, a carboline derivative, for σ2 receptor affinity through radioligand binding assay and the results confirmed the predicted high µM range of affinity and good selectivity. The obtained results could be helpful in the drug design process of new ibogaine simplified analogs with improved σ2 receptor binding capabilities. View Full-Text
Keywords: sigma-2 receptor; TMEM97; scaffold-hopping; molecular docking; Ibogaine; Pinoline; Incazane sigma-2 receptor; TMEM97; scaffold-hopping; molecular docking; Ibogaine; Pinoline; Incazane
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Floresta, G.; Dichiara, M.; Gentile, D.; Prezzavento, O.; Marrazzo, A.; Rescifina, A.; Amata, E. Morphing of Ibogaine: A Successful Attempt into the Search for Sigma-2 Receptor Ligands. Int. J. Mol. Sci. 2019, 20, 488.

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