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Related Experiment Videos

How do selectins mediate leukocyte rolling in venules?

A Tözeren1, K Ley

  • 1Department of Mechanical Engineering, Catholic University of America, Washington, D.C. 20064.

Biophysical Journal
|September 1, 1992
PubMed
Summary

Leukocyte rolling, crucial for inflammation, is mediated by selectin adhesion molecules. A new biophysical model reveals that high bond formation and low detachment rates, particularly at the rear of the contact area, enable rolling under flow.

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Area of Science:

  • Immunology and Biophysics
  • Cellular and Molecular Biology

Background:

  • Leukocyte rolling along postcapillary venules is a key early event in inflammation, involving 20-80% of leukocytes.
  • Selectin adhesion molecules are implicated in mediating leukocyte rolling, but the precise biophysical mechanisms differentiating rolling from firm adhesion under flow remain unclear.

Purpose of the Study:

  • To develop a quantitative biophysical model explaining selectin-mediated leukocyte rolling.
  • To elucidate the specific molecular interactions and mechanical properties governing leukocyte adhesion under fluid flow conditions.

Main Methods:

  • Development of a quantitative biophysical model integrating mechanics, biochemistry, and biophysics of selectin-mediated interactions.
  • Computational experiments simulating leukocyte-endothelial cell interactions under varying fluid shear rates.

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Main Results:

  • The model suggests a mechanism characterized by high bond formation rates and low detachment rates.
  • A high, uniform detachment rate at the rear of the contact area, where bonds are stretched, is critical.
  • Bond length and flexibility significantly enhance leukocyte rolling across a broad range of fluid shear rates.

Conclusions:

  • The biophysical properties of selectin-ligand bonds, including their length and flexibility, are crucial for leukocyte rolling.
  • The model provides a mechanistic explanation for how selectins facilitate leukocyte adhesion and rolling under physiological flow conditions.