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Títol:
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Molecular basis of the selective binding of MDMA enantiomers to the Alpha4Beta2 nicotinic receptor subtype: synthesis, pharmacological evaluation and mechanistic studies
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Autor/a:
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Borrell Bilbao, José Ignacio; Llabrés Prat, Salomé; García-Ratés, Sara; Cristóbal Lecina, Edgar; Riera i Escalé, Antoni; Camarasa García, Jordi; Pubill Sánchez, David; Luque Garriga, F. Xavier; Escubedo Rafa, Elena
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Altres autors:
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Universitat Ramon Llull. IQS |
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Abstract:
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The α4β2 nicotinic acetylcholine receptor (nAChR) is a molecular target of 3,4-methylenedioxymethamphetamine (MDMA), a synthetic drug also known as ecstasy, and it modulates the MDMA-mediated reinforcing properties. However, the enantioselective preference of the α4β2 nAChR subtype still remains unknown. Since the two enantiomers exhibit different pharmacological profiles and stereoselective metabolism, the aim of this study is to assess a possible difference in the interaction of the MDMA enantiomers with this nAChR subtype. To this end, we report a novel simple, yet highly efficient enantioselective synthesis of the MDMA enantiomers, in which the key step is the diastereoselective reduction of imides derived from optically pure tert-butylsulfinamide. The enantioselective binding to the receptor is examined using [3H]epibatidine in a radioligand assay. Even though the two enantiomers induced a concentration-dependent binding displacement, (S)-MDMA has an inhibition constant 13-fold higher than (R)-MDMA, which shows a Hill's coefficient not significantly different from unity, implying a competitive interaction. Furthermore, when NGF-differentiated PC12 cells were pretreated with the compounds, a significant increase in binding of [3H]epibatidine was found for (R)-MDMA, indicating up-regulation of heteromeric nAChR in the cell surface. Finally, docking and molecular dynamics studies have been used to identify the binding mode of the two enantiomers, which provides a structural basis to justify the differences in affinity from the differential interactions played by the substituents at the stereogenic centre of MDMA. The results provide a basis to explore the distinct psychostimulant profiles of the MDMA enantiomers mediated by the α4β2 nAChR subtype. |
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Data de publicació:
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06-2014 |
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Matèries (CDU):
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54 - Química |
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Matèries:
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Nicotina--Receptors
Amfetamines
Èxtasi (Droga)
Estructura molecular
Alpha4Beta2 nicotinic receptor
MDMA
Enantioselective binding
Receptor up-regulation
Stereoselective synthesis
Molecular modelling |
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Drets:
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© Elsevier Masson SAS
L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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Pàgines:
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43 p. |
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Tipus de document:
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Article
Article - Versió acceptada |
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DOI:
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https://doi.org/10.1016/j.ejmech.2014.04.044
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Publicat per:
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Elsevier + French Société de Chimie Thérapeutique
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Publicat a:
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European Journal of Medicinal Chemistry. Vol.81 (2014), p.35-46
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Compartir:
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