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Neutrophils roll on E-selectin

M B Lawrence1, T A Springer

  • 1Center for Blood Research, Harvard Medical School, Boston, MA 02115.

Journal of Immunology (Baltimore, Md. : 1950)
|December 1, 1993
PubMed
Summary
This summary is machine-generated.

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Neutrophils exhibit stronger rolling adhesions on E-selectin compared to P-selectin under simulated venule flow. This suggests E-selectin

Area of Science:

  • Immunology
  • Cellular Biology
  • Biophysics

Background:

  • Neutrophil adhesion and migration are critical processes in inflammation.
  • Selectins mediate initial leukocyte adhesion to the endothelium.
  • E-selectin and P-selectin are key adhesion molecules involved in neutrophil trafficking.

Purpose of the Study:

  • To investigate and compare the adhesive properties of neutrophils on E-selectin versus P-selectin.
  • To elucidate the biomechanical differences in neutrophil rolling on these selectins under physiological flow conditions.

Main Methods:

  • Utilized flow chambers to simulate post-capillary venule conditions.
  • Employed substrates coated with purified E-selectin and P-selectin.
  • Quantified neutrophil attachment efficiency, rolling velocity, and adhesion strength.

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Main Results:

  • Neutrophil attachment efficiency on E-selectin was dependent on wall shear stress and selectin density, similar to P-selectin.
  • Neutrophils formed significantly stronger rolling adhesions on E-selectin compared to P-selectin.
  • Rolling velocities on E-selectin were slower and less variable than on P-selectin.
  • Rolling velocity plateaued with increasing shear stress, indicating bond strength and number, not applied force, limit velocity.

Conclusions:

  • E-selectin mediates stronger neutrophil rolling adhesions than P-selectin.
  • Neutrophil rolling dynamics on E-selectin are governed by receptor-ligand bond properties.
  • These findings provide insights into the distinct roles of E-selectin and P-selectin in neutrophil recruitment during inflammation.