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Related Experiment Videos

Extracellular space structure revealed by diffusion analysis

C Nicholson1, E Syková

  • 1Dept of Physiology and Neuroscience, New York University Medical Center, NY 10016, USA.

Trends in Neurosciences
|June 4, 1998
PubMed
Summary
This summary is machine-generated.

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Brain extracellular space, characterized by volume fraction (alpha) and tortuosity (lambda), facilitates molecule diffusion. These parameters change in different physiological and pathophysiological states, supporting extrasynaptic transmission.

Area of Science:

  • Neuroscience
  • Biophysics

Background:

  • The brain's extracellular space (ECS) is a complex network crucial for neuronal communication.
  • Understanding the ECS structure and dynamics is key to comprehending information transfer beyond direct synaptic connections.

Purpose of the Study:

  • To investigate the structural and dynamic properties of the brain's ECS.
  • To determine the impact of molecular size and physiological conditions on diffusion within the ECS.
  • To assess the feasibility of extrasynaptic or volume transmission.

Main Methods:

  • Diffusion measurements using molecules of varying molecular weights (<500 Mr, > or =3000 Mr, 70000 Mr).
  • Estimation of volume fraction (alpha) and tortuosity (lambda) based on molecular concentration distribution.
  • Analysis of ECS parameters during stimulation and in pathophysiological states (e.g., severe ischemia).

Related Experiment Videos

Main Results:

  • ECS structure resembles foam, with estimated volume fraction (alpha) ~0.2 and tortuosity (lambda) ~1.6 for smaller molecules.
  • Larger molecules (> or =3000 Mr) experience greater hindrance, but molecules up to 70000 Mr can still traverse the ECS.
  • Significant changes in alpha and lambda observed during stimulation and in severe ischemia (e.g., alpha = 0.04, lambda = 2.2).

Conclusions:

  • The ECS exhibits properties that allow for diffusion-based communication.
  • Changes in ECS parameters during altered physiological states impact molecule transport.
  • The findings support the concept of extrasynaptic or volume transmission as a viable mode of neural communication.