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Reversible Control of Native GluN2B-Containing NMDA Receptors with Visible Light.
Chloé Geoffroy1, Romain Berraud-Pache2, Nicolas Chéron3
1Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris F-75005, France.
ACS Chemical Neuroscience
|September 6, 2024
Summary
Researchers developed OptoNAM-3, a novel light-activated drug that precisely controls NMDA receptors (NMDARs). This tool allows reversible inhibition of GluN2B-NMDARs using visible light for studying brain function.
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- NMDA receptors (NMDARs) are crucial for synaptic function, and their dysfunction is implicated in neuropsychiatric disorders.
- GluN2B-containing NMDARs (GluN2B-NMDARs) play key roles in cognition and excitotoxicity, but their precise involvement is debated.
- Existing GluN2B-selective antagonists have limitations due to slow and irreversible effects, hindering their use in dynamic biological systems.
Purpose of the Study:
- To develop a photoswitchable negative allosteric modulator (OptoNAM-3) for selective and reversible inhibition of GluN2B-NMDARs.
- To investigate the in vitro and in vivo efficacy of OptoNAM-3 for precise temporal control of GluN2B-NMDAR activity.
- To explore the photochemical properties of OptoNAM-3 and the influence of the binding site on photoswitching behavior.
Main Methods:
- Development of OptoNAM-3, a photoswitchable negative allosteric modulator targeting GluN2B-NMDARs.
- In vitro and in vivo experiments using Xenopus tadpoles to assess light-induced inhibition of GluN2B-NMDAR activity.
- Analysis of the photoswitching properties of OptoNAM-3, including its response to different light wavelengths.
Main Results:
- OptoNAM-3 demonstrated light-induced, reversible inhibition of GluN2B-NMDAR activity with precise temporal control.
- The compound was effective both in vitro and in vivo, influencing the behavior of freely moving Xenopus tadpoles.
- OptoNAM-3 exhibited red-shifted photoswitching, enabling activity modulation with blue light (visible spectrum) instead of UV light.
- Binding site interactions were identified as crucial for the observed photochemical properties of the azobenzene moiety.
Conclusions:
- OptoNAM-3 provides a powerful tool for the selective, fast, and reversible photocontrol of native GluN2B-NMDARs.
- The visible light-compatible photoswitching properties make OptoNAM-3 suitable for investigating GluN2B-NMDAR physiology in native tissues.
- This study underscores the significance of ligand-binding site interactions in tailoring the photochemical characteristics of photoswitchable molecules.
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