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Factors governing diffusing molecular signals in brain extracellular space.

C Nicholson1

  • 1Department of Physiology and Neuroscience, New York University School of Medicine, New York, NY 10016, USA. charles.nicholson@nyu.edu

Journal of Neural Transmission (Vienna, Austria : 1996)
|September 17, 2004
PubMed
Summary

Brain extracellular space diffusion is key for chemical signal transmission. This review explores how tortuosity and volume fraction affect diffusion, noting potential dead-space microdomains and aging effects.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Cellular Biology

Background:

  • Volume transmission is crucial for intercellular communication in the brain.
  • Diffusion is the primary mechanism for signal molecule transport through the brain's extracellular space.
  • Understanding extracellular space properties is vital for comprehending brain function.

Purpose of the Study:

  • To review the biophysical principles of diffusion in the brain.
  • To examine how extracellular space characteristics influence diffusion.
  • To discuss the implications of diffusion dynamics in the aging brain.

Main Methods:

  • Review of existing literature on diffusion in the brain.
  • Analysis of biophysical models of diffusion.

Related Experiment Videos

  • Summary of experimental findings on extracellular space properties.

    • Main Results:

    • Extracellular space tortuosity and volume fraction significantly modify diffusion rates.
    • Evidence suggests the extracellular space comprises both well-connected areas and isolated microdomains.
    • Diffusion dynamics in the aging rat brain have been previously investigated.

    Conclusions:

    • Diffusion in the brain extracellular space is a complex process influenced by its physical characteristics.
    • The presence of microdomains may create localized variations in signal transmission.
    • Further research into age-related changes in brain diffusion is warranted.