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A High-content Assay for Monitoring AMPA Receptor Trafficking
Published on: January 28, 2019
Direct interaction between GluR2 and GAPDH regulates AMPAR-mediated excitotoxicity.
Min Wang1, Shupeng Li, Hongyu Zhang
1Department of Neuroscience, Centre for Addiction and Mental Health, Toronto, Canada.
Molecular Brain
|April 28, 2012
Summary
Over-activation of α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptors (AMPARs) causes excitotoxic neuronal death. A new study reveals that blocking the GluR2/GAPDH interaction prevents this damage, offering a potential therapeutic target for brain insults like stroke.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Over-activation of AMPARs contributes to excitotoxic neuronal death in acute brain injuries like ischemic stroke.
- The precise mechanisms of AMPAR-mediated excitotoxicity, particularly involving calcium-impermeable AMPARs, are not fully understood.
Purpose of the Study:
- To identify the molecular pathway underlying GluR2-containing AMPAR-mediated excitotoxicity.
- To investigate the role of protein-protein interactions in AMPAR-induced neuronal death.
Main Methods:
- Investigated protein-protein interactions following AMPAR stimulation.
- Utilized an interfering peptide to disrupt identified interactions.
- Assessed neuronal damage using an in vitro model of brain ischemia (oxygen-glucose deprivation).
Main Results:
- Identified a novel molecular pathway involving direct GluR2/GAPDH complex formation upon AMPAR activation.
- Demonstrated that AMPAR stimulation promotes GluR2/GAPDH complex formation and receptor internalization.
- Showed that disrupting the GluR2/GAPDH interaction with a peptide prevents AMPAR-mediated excitotoxicity and protects against oxygen-glucose deprivation-induced damage.
Conclusions:
- A direct protein-protein interaction between GluR2 and GAPDH mediates AMPAR-induced excitotoxicity.
- Targeting the GluR2/GAPDH interaction represents a potential therapeutic strategy for acute brain insults.
- This finding offers new insights into the molecular mechanisms of excitotoxic neuronal death.
