Fluorine-tuned AMPA modulator acts as molecular glue to hold receptor open and lift mood in mice
- Researchers varied the 6-position of an oxathiazine-dioxide scaffold and picked a fluorinated analog, C17, as the best lead.
- Molecular dynamics suggested C17 grips the GluA2 ligand-binding domain dimer through hydrogen bonds, outperforming the clinical comparator TAK-653 and blocking desensitization.
- In stressed mice it showed antidepressant-like activity, and in rat hippocampal neurons it boosted AMPA currents without acting as an agonist itself.
- It also raised BDNF expression in a dose-dependent way.
💡 Points Based on the abstract
Beating TAK-653 in a GaMD simulation is a hypothesis, not evidence; I'd want a GluA2 LBD co-crystal or cryo-EM structure of C17 to confirm the dimer-interface H-bonds and the fluorine's role, plus a des-fluoro matched pair. The bigger question is the AMPA PAM liability: bell-shaped dose response, seizure and excitotoxicity margins, and brain exposure all need data before the BDNF and mouse behavior read as a window.
📄 Paper · European Journal of Medicinal Chemistry (Elsevier) ↗ Discovery of a fluorinated benzoxathiazine AMPA receptor PAM that stabilizes the GluA2 dimer interface and displays antidepressant-like effects