Related Experiment Video
Updated: Sep 16, 2025
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A High-content Assay for Monitoring AMPA Receptor Trafficking
Published on: January 28, 2019
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Collapsin response mediator protein 2 modulates synaptic function by stabilizing the surface expression of
JiaMing Wu1, Bingyu Ren2, Yichen Yin3
1Neuroscience Laboratory for Cognitive and Developmental Disorders, Department of Anatomy, Medical College of Jinan University, Guangzhou 510630, China; Department of Neurosurgery, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China.
Brain Research
|July 6, 2025
Summary
Collapsin response mediator protein 2 (CRMP2) stabilizes surface expression of GluA2, a key receptor in excitatory synapses. This interaction enhances synaptic function, even when GluA2 is phosphorylated.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Collapsin response mediator protein 2 (CRMP2) is crucial for neuronal development.
- CRMP2 regulates the surface expression of AMPA receptor subunit GluA1.
- The role of CRMP2 in regulating GluA2, a calcium-impermeable AMPAR subunit, is unknown.
Purpose of the Study:
- To investigate the interaction between CRMP2 and GluA2.
- To determine CRMP2's effect on GluA2 surface expression and synaptic function.
- To elucidate CRMP2's role in regulating GluA2 trafficking under PKC activation.
Main Methods:
- Co-immunoprecipitation assays to study protein interactions.
- Surface expression analysis using western blotting and immunofluorescence.
- Electrophysiological recordings to measure miniature excitatory synaptic currents (mEPSCs).
- CRMP2 knockdown using siRNA and site-directed mutagenesis of GluA2.
Main Results:
- CRMP2 directly interacts with wild-type GluA2, increasing its surface expression and enhancing mEPSC amplitude and frequency.
- CRMP2 overexpression prevents the TPA-induced decrease in GluA2 surface expression.
- Phosphorylation of GluA2 at S880 promotes CRMP2-GluA2 binding.
- CRMP2 knockdown reduces mEPSCs induced by PKCζ activation.
Conclusions:
- CRMP2 plays a significant role in AMPA receptor trafficking.
- CRMP2 stabilizes surface GluA2 expression, irrespective of its phosphorylation status.
- CRMP2's interaction with GluA2 modulates excitatory synaptic transmission.
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