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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Related Experiment Video

Updated: Apr 12, 2026

Diffusion Imaging in the Rat Cervical Spinal Cord
10:46

Diffusion Imaging in the Rat Cervical Spinal Cord

Published on: April 7, 2015

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Anomalous extracellular diffusion in rat cerebellum.

Fanrong Xiao1, Jan Hrabe2, Sabina Hrabetova3

  • 1Department of Cell Biology, State University of New York, Downstate Medical Center, Brooklyn, New York.

Biophysical Journal
|May 9, 2015
PubMed
Summary
This summary is machine-generated.

Anomalous extracellular diffusion was observed in rat cerebellum's granular layers, supporting the dead-space microdomain hypothesis for hindered molecular transport in the brain. This finding impacts understanding of brain signaling.

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Last Updated: Apr 12, 2026

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Area of Science:

  • Neuroscience
  • Biophysics
  • Computational Biology

Background:

  • The brain's extracellular space (ECS) facilitates molecule and drug transport, but its structure hinders diffusion.
  • The microscopic basis of this hindrance, potentially involving dead-space (DS) microdomains, is not fully understood.

Purpose of the Study:

  • To investigate anomalous extracellular diffusion in cerebellar granular layers (GL) of rats and turtles.
  • To test the hypothesis that dead-space microdomains contribute to diffusion hindrance in the ECS.

Main Methods:

  • Integrative optical imaging (IOI) to assess diffusion of fluorescently labeled dextran (MW 3000) in GL.
  • Quantification of the anomalous diffusion exponent (dw) from IOI data.
  • Complementary 3D Monte Carlo simulations of diffusion in tissue models with glomeruli-like structures.

Main Results:

  • Significantly anomalous diffusion (dw = 4.8) was detected in rat GL.
  • Elevated, but not robustly anomalous, diffusion (dw = 2.6) was observed in turtle GL.
  • Simulations showed that glomeruli size and wrapping influence transient anomalous diffusion duration and exponent.

Conclusions:

  • Anomalous extracellular diffusion in rat cerebellar GL supports the dead-space microdomain hypothesis.
  • Transient anomalous diffusion significantly affects molecular distribution in the ECS, potentially speeding up short-range signals.