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A High-content Assay for Monitoring AMPA Receptor Trafficking
Published on: January 28, 2019
A GluR1-cGKII interaction regulates AMPA receptor trafficking
Yafell Serulle1, Shuang Zhang, Ipe Ninan
1Program in Neuroscience and Physiology, New York University School of Medicine, New York, NY 10016, USA.
Neuron
|November 23, 2007
Summary
cGMP-dependent protein kinase II (cGKII) activation by cGMP enhances surface expression of AMPA receptors (AMPARs). This cGKII-GluR1 interaction is crucial for synaptic plasticity and long-term potentiation (LTP) in the hippocampus.
Area of Science:
- Neuroscience
- Molecular Biology
- Cellular Signaling
Background:
- AMPA receptor (AMPAR) trafficking is vital for synaptic plasticity.
- Mechanisms regulating AMPAR trafficking via subunit C-terminal domains (CTDs) remain incompletely understood.
Purpose of the Study:
- To elucidate the role of cGMP-dependent protein kinase II (cGKII) in AMPAR trafficking and synaptic plasticity.
- To identify specific protein interactions and signaling pathways involved in regulating GluR1 subunit surface expression.
Main Methods:
- Co-immunoprecipitation to detect protein complex formation in brain tissue.
- In vitro kinase assays to assess phosphorylation activity.
- Electrophysiological recordings (chemLTP and LTP) in hippocampal slices.
- Confocal microscopy to measure surface receptor expression.
Main Results:
- The GluR1 CTD binds to cGKII, with binding enhanced upon cGKII activation by cGMP.
- cGKII forms a complex with GluR1 in the brain and phosphorylates GluR1 at the S845 site.
- cGKII activation increases extrasynaptic AMPAR surface expression.
- Inhibition of cGKII activity impairs GluR1 surface increase during chemLTP and reduces hippocampal LTP.
Conclusions:
- cGKII is a key regulator of AMPAR trafficking and synaptic plasticity.
- A novel signaling pathway involving cGKII, downstream of NMDA receptors and nitric oxide, promotes GluR1 membrane accumulation.
- This pathway plays a significant role in hippocampal long-term potentiation.
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