Pharmacological characterization and binding modes of novel racemic and optically active phenylalanine-based antagonists of AMPA receptors

Research output: Contribution to journalJournal articleResearchpeer-review

Ewa Szymańska, Birgitte Nielsen, Tommy Nørskov Johansen, Anna Maria Cuñado Moral, Darryl S Pickering, Katarzyna Szczepańska, Anna Mickowska, Katarzyna Kieć-Kononowicz

In order to map out molecular determinants for the competitive blockade of AMPA receptor subtypes, a series of racemic aryl-substituted phenylalanines was synthesized and pharmacologically characterized in vitro at native rat ionotropic glutamate receptors. Most of the compounds showed micromolar affinity and preference for AMPA receptors. Individual stereoisomers of selected compounds were further evaluated at recombinant homomeric rat GluA2 and GluA3 receptors. The most potent compound, (–)-2-amino-3-(6-chloro-2',5'-dihydroxy-5-nitro-[1,1'-biphenyl]-3-yl)propanoic acid, the expected R-isomer showing Ki of 1.71 µM at the GluA2 subtype, was found to competitively antagonize GluA2(Q)i receptors in TEVC electrophysiological experiments (Kb = 2.13 µM). Molecular docking experiments allowed us to compare two alternative antagonist binding modes for the synthesized phenylalanines at the GluA2 binding core, showing the direction for further structural modifications.
Original languageEnglish
JournalEuropean Journal of Medicinal Chemistry
Volume138
Pages (from-to)874-883
Number of pages10
ISSN0223-5234
DOIs
Publication statusPublished - 2017

ID: 180855900