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Cortical Synaptic AMPA Receptor Plasticity during Motor Learning.

Richard H Roth1, Robert H Cudmore2, Han L Tan1

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

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Summary

Motor learning enhances synaptic strength by increasing AMPA receptor (AMPAR) trafficking in the brain. This occurs in both motor and visual cortex, suggesting widespread plasticity during learning.

Keywords:
AMPA receptorslong-term potentiationmotor cortexmotor learningsynaptic clusteringsynaptic plasticitytwo-photon imagingvisual cortex

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Learning and Memory

Background:

  • Synaptic plasticity, driven by AMPA receptor (AMPAR) trafficking, is crucial for learning and memory.
  • The in vivo dynamics of AMPAR trafficking and its link to learning remain unclear.

Purpose of the Study:

  • To investigate the in vivo dynamics of surface AMPAR trafficking during motor learning.
  • To explore the correlation between AMPAR trafficking and learning performance.

Main Methods:

  • In vivo two-photon microscopy to visualize surface AMPARs in the mouse cortex.
  • Forelimb reaching task for motor learning acquisition.
  • Optogenetic manipulation of visual cortex activity.

Main Results:

  • Daily motor training increased AMPAR levels at dendritic spines in the motor cortex.
  • AMPAR levels also increased in the visual cortex, dependent on visual input.
  • Inhibiting visual cortex activity during training impaired task performance.

Conclusions:

  • Motor learning induces widespread cortical synaptic potentiation via increased AMPAR trafficking.
  • Non-motor regions, like the visual cortex, are involved in motor learning-related plasticity.