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Related Experiment Videos

Neuronal and glial cytoskeletons.

D W Cleveland1, P N Hoffman

  • 1Department of Biological Chemistry, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21205.

Current Opinion in Neurobiology
|October 1, 1991
PubMed
Summary

Major neuronal proteins are essential for neurite extension, while glial and neurofilaments shape glial cells and axons. Cytoskeletal roles in axonal transport and guidance need re-evaluation.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Cytoskeletal Dynamics

Background:

  • Microtubule-associated proteins (MAPs) are crucial for neuronal structure and function.
  • The roles of glial intermediate filaments and neurofilaments in neural development are less understood.
  • Axonal transport mechanisms and guidance cues are actively researched areas.

Purpose of the Study:

  • To elucidate the in vivo functions of major neuronal microtubule-associated proteins.
  • To investigate the role of glial intermediate filaments and neurofilaments in neural development.
  • To re-examine models of axonal transport and guidance based on new experimental data.

Main Methods:

  • In vivo functional studies of neuronal microtubule-associated proteins.
  • Analysis of glial cell extension using intermediate filaments.
  • Investigation of neurofilament involvement in axonal caliber.
  • Fluorescence and photoactivation experiments to study cytoskeletal dynamics.

Main Results:

  • Direct evidence links major neuronal microtubule-associated proteins to neurite extension.
  • Glial intermediate filaments are intrinsically involved in glial cell extension along neurites.
  • Neurofilaments play a key role in establishing axonal caliber.
  • New data necessitates rethinking models of slow axonal transport and cytoskeletal involvement in axonal guidance.

Conclusions:

  • Neuronal microtubule-associated proteins are critical for neurite outgrowth.
  • Glial and neuronal cytoskeletal elements have distinct, vital roles in neural development and structure.
  • Current understanding of axonal transport and guidance requires revision in light of cytoskeletal dynamics.

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