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Related Experiment Videos

Simultaneous tether extraction contributes to neutrophil rolling stabilization: a model study.

Yan Yu1, Jin-Yu Shao

  • 1Department of Biomedical Engineering, Washington University, Saint Louis, Missouri 63130, USA.

Biophysical Journal
|October 31, 2006
PubMed
Summary
This summary is machine-generated.

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Membrane tethers are crucial for stable neutrophil rolling during inflammation. Simultaneous tether extraction from neutrophils and endothelial cells significantly enhances rolling stability and shear resistance.

Area of Science:

  • Immunology
  • Biophysics
  • Cell Biology

Background:

  • Neutrophil rolling is a critical initial step in recruiting neutrophils to inflammatory sites.
  • Membrane tethers are likely extracted from both neutrophils and endothelial cells during this process.

Purpose of the Study:

  • To investigate the role of membrane tethers in stable neutrophil rolling.
  • To model the contribution of tether extraction to neutrophil recruitment dynamics.

Main Methods:

  • Developed a two-dimensional model of neutrophil rolling.
  • Modeled neutrophils as spheres with microvilli and endothelial cells as ligand-decorated surfaces.
  • Coupled hydrodynamic resistance, geometric relationships, and constitutive equations for tether extraction.

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Main Results:

  • Glutaraldehyde-fixed neutrophils (no tethering) exhibited unstable rolling with high velocity variance.
  • Normal neutrophils demonstrated significantly more stable rolling with lower velocity variance.
  • Simultaneous tether extraction from both cell types increased adhesive bond lifetime and shear resistance.

Conclusions:

  • Membrane tether dynamics are essential for stable neutrophil rolling.
  • Simultaneous tether extraction from neutrophils and endothelial cells enhances rolling stability and shear resistance.
  • This mechanism is vital for effective neutrophil recruitment to inflammatory sites.