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Updated: Jun 4, 2026

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
Published on: October 6, 2017
PICK1 loss of function occludes homeostatic synaptic scaling.
Victor Anggono1, Roger L Clem, Richard L Huganir
1Department of Neuroscience, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
This study reveals that PICK1 protein is crucial for synaptic scaling during neuronal inactivity. Its absence impairs the trafficking of AMPA receptors (AMPARs), affecting synaptic strength regulation.
Area of Science:
- Neuroscience
- Molecular Biology
- Synaptic Plasticity
Background:
- Homeostatic synaptic scaling adjusts neuronal excitability by modifying synaptic strengths.
- The molecular mechanisms governing AMPA receptor (AMPAR) trafficking during scaling are not fully understood.
Purpose of the Study:
- To investigate the role of PICK1 in the molecular regulation of AMPA receptor trafficking during homeostatic synaptic scaling.
Main Methods:
- Utilized PICK1 knock-out mouse models.
- Performed electrophysiological recordings.
- Analyzed AMPAR subunit composition and surface abundance.
Main Results:
- Chronic activity blockade reduced PICK1 protein levels, correlating with surface AMPAR accumulation.
- PICK1 deficiency altered GluA2-containing AMPAR subunit composition and abundance.
- PICK1 knock-out neurons exhibited occluded synaptic strength increase during inactivity due to aberrant receptor trafficking.
Conclusions:
- PICK1 plays a critical role in inactivity-induced synaptic scaling.
- PICK1 regulates the composition, abundance, and trafficking of GluA2-containing AMPARs during homeostatic plasticity.
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