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Glial protein S100B modulates long-term neuronal synaptic plasticity.

Hiroshi Nishiyama1, Thomas Knopfel, Shogo Endo

  • 1Laboratories for Behavioral Genetics and Neuronal Circuit Dynamics, and Neuronal Circuit Mechanisms Research Group, Brain Science Institute (BSI), Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

Proceedings of the National Academy of Sciences of the United States of America
|March 14, 2002
PubMed
Summary

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Glial cells, specifically astrocytes, influence brain function. The study found that removing calcium-binding protein S100B enhances synaptic plasticity and memory in mice.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Glial cells, traditionally viewed as support cells, are increasingly recognized for their role in synaptic function.
  • Astrocytes, a major glial cell type, synthesize calcium-binding protein S100B.

Purpose of the Study:

  • To investigate the role of S100B in modulating synaptic plasticity and cognitive function.
  • To determine if S100B acts extracellularly in regulating neuronal function.

Main Methods:

  • Utilized mutant mice lacking S100B.
  • Assessed long-term potentiation (LTP) in hippocampal CA1 region.
  • Administered recombinant S100B protein to hippocampal slices.
  • Evaluated spatial and fear memory using behavioral tests (Morris water maze, contextual fear conditioning).

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Main Results:

  • Mice lacking S100B exhibited enhanced LTP, indicating strengthened synaptic plasticity.
  • Extracellular application of S100B reversed LTP levels in mutant mice to wild-type levels.
  • S100B-deficient mice showed improved spatial and fear memory performance.

Conclusions:

  • S100B acts as a glial modulator of neuronal synaptic plasticity.
  • Glial-neuronal interactions mediated by proteins like S100B are crucial for brain information processing.
  • Targeting S100B may offer therapeutic potential for cognitive disorders.