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Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
07:43

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Published on: May 12, 2015

MEF2 negatively regulates learning-induced structural plasticity and memory formation.

Christina J Cole1, Valentina Mercaldo, Leonardo Restivo

  • 1Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Ontario, Canada.

Nature Neuroscience
|August 14, 2012
PubMed
Summary
This summary is machine-generated.

Myocyte enhancer factor 2 (MEF2) restricts memory formation by inhibiting spine remodeling. Reducing MEF2 function enhances memory, while increasing it blocks memory formation, highlighting MEF2 as a key plasticity regulator.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Memory formation involves dendritic spine growth and remodeling.
  • Myocyte enhancer factor 2 (MEF2) is a transcription factor that restricts spine growth in vitro.
  • MEF2's role in in vivo memory formation and spine remodeling is unclear.

Purpose of the Study:

  • To investigate the role of MEF2 in adult memory formation and associated spine remodeling.
  • To determine the impact of manipulating MEF2 function on spatial and fear memory.
  • To elucidate the molecular mechanisms, including AMPA receptor trafficking, underlying MEF2's effects on memory.

Main Methods:

  • In vivo manipulation of MEF2 function in specific brain regions (dentate gyrus, amygdala) of adult mice.
  • Assessment of spatial and fear memory formation.
  • Measurement of dendritic spine density and remodeling.
  • Interference with AMPA receptor endocytosis.

Main Results:

  • Increased MEF2 function blocked learning-induced spine density increases and spatial memory formation in the dentate gyrus.
  • Elevated MEF2 in the amygdala disrupted fear memory formation.
  • MEF2-induced memory deficits were rescued by interfering with AMPA receptor endocytosis.
  • Decreased MEF2 function facilitated spatial and fear memory formation.

Conclusions:

  • MEF2 acts as a critical negative regulator of plasticity underlying memory formation.
  • MEF2-mediated suppression of transcription must be relieved to permit memory formation.
  • AMPA receptor trafficking is a key mechanism through which MEF2 influences memory plasticity.