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GRIP1 regulates synaptic plasticity and learning and memory.

Han L Tan1, Shu-Ling Chiu1,2, Qianwen Zhu1

  • 1Solomon H. Snyder Department of Neuroscience and Kavli Neuroscience Discovery Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205.

Proceedings of the National Academy of Sciences of the United States of America
|September 19, 2020
PubMed
Summary

Glutamate receptor interacting protein 1 (GRIP1) is essential for learning and memory. This protein regulates the trafficking of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs) at synapses, crucial for synaptic plasticity.

Keywords:
AMPA receptorGRIP1LTPlearning and memorysynaptic plasticity

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • Hebbian plasticity, vital for learning and memory, involves regulating alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) trafficking.
  • Molecular mechanisms of AMPAR trafficking are not fully understood.

Purpose of the Study:

  • To investigate the role of glutamate receptor interacting protein 1 (GRIP1) in synaptic plasticity, learning, and memory.
  • To elucidate the molecular mechanisms by which GRIP1 regulates AMPAR trafficking.

Main Methods:

  • Utilized GRIP1 knockout mice and neuronal deletion of Grip1.
  • Examined AMPAR accumulation via glycine-mediated depolarization.
  • Assessed hippocampal long-term potentiation (LTP) and learning/memory behaviors.
  • Analyzed phosphorylation of GluA2 AMPAR subunit at serine-880 and tyrosine-876.

Main Results:

  • Deletion of Grip1 blocked synaptic AMPAR accumulation and impaired hippocampal LTP.
  • Grip1 knockout mice showed deficits in learning and memory.
  • GRIP1 recruitment into synapses occurred during LTP.
  • Phosphorylation changes in GluA2 (decreased S880, increased Y876) enhanced GRIP1-AMPAR association and AMPAR insertion.

Conclusions:

  • GRIP1 is essential for regulating AMPAR trafficking during synaptic plasticity.
  • GRIP1 plays a critical role in learning and memory processes.
  • GRIP1's function is mediated by modulating the association with AMPAR subunits through specific phosphorylation events.