Evaluation of thiadiazine-based PET radioligands for imaging the AMPA receptor - 11/11/23
Abstract |
As a subclass of ionotropic glutamate receptors (iGluRs), α-amino-3-hydroxyl-5-methyl-4-isoxazolepropionic acid (AMPA) receptors have been implicated in various neurological disorders and neurodegenerative diseases. To further our understanding of AMPA receptor-related disorders in the central nervous system (CNS), it is important to be able to image and quantify AMPA receptors in vivo. In this study, we identified a novel F-containing AMPA positive allosteric modulator (PAM) 6 as a potential lead compound. Molecular docking studies and CNS PET multi-parameter optimization (MPO) analysis were used to predict the absorption, distribution, metabolism, and excretion (ADME) characteristics of 6 as a PET probe. The resulting PET probe, [18F]6 (codename [18F]AMPA-2109), was successfully radiolabeled and demonstrated excellent blood-brain barrier (BBB) permeability and high brain uptake in rodents and non-human primates. However, [18F]6 did not show substantial specific binding in the rodent or non-human primate brain. Further medicinal chemistry efforts are necessary to improve specific binding, and our work may serve as a starting point for the design of novel 18F-labeled AMPA receptor-targeted PET radioligands aimed for clinical translation.
Le texte complet de cet article est disponible en PDF.Graphical Abstract |
Highlights |
• | Novel F-containing AMPA positive allosteric modulator was identified as a potential lead compound. |
• | [18F]AMPA-2109 demonstrated excellent BBB permeability and high brain uptake in rodent and non-human primate brains. |
• | [18F]6 showed low-to-moderate specific binding, necessitating further medicinal chemistry efforts for improvement. |
• | [18F]6 provides an excellent starting point for designing new fluorinated allosteric modulator-based AMPA receptor tracers. |
Keywords : AMPA receptors, Central nervous system (CNS), Positron emission tomography, Positive allosteric modulator (PAM), Fluorine 18 (18F)
Plan
Vol 168
Article 115842- décembre 2023 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
L’accès au texte intégral de cet article nécessite un abonnement.
Déjà abonné à cette revue ?