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Related Experiment Videos

The effect of transendothelial migration on eosinophil function.

H Yamamoto1, J B Sedgwick, R F Vrtis

  • 1Pulmonary Division, Second Department of Internal Medicine, Saitama Medical School, Saitama, Japan.

American Journal of Respiratory Cell and Molecular Biology
|September 6, 2000
PubMed
Summary
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Transendothelial migration enhances eosinophil inflammatory capacity in asthma by increasing survival and receptor expression. This process, involving human pulmonary microvascular endothelial cells, influences the final airway eosinophil phenotype.

Area of Science:

  • Immunology
  • Cell Biology
  • Respiratory Medicine

Background:

  • Eosinophils in bronchial asthma exhibit heightened inflammatory potential.
  • Transendothelial migration is hypothesized to alter eosinophil functional phenotype.

Purpose of the Study:

  • To model eosinophil trafficking to the lung and investigate the impact of transendothelial migration on eosinophil phenotype.
  • To analyze changes in surface receptor expression, in vitro survival, and oxidative burst of eosinophils post-migration.

Main Methods:

  • Cultured human pulmonary microvascular endothelial cell (HPMEC) monolayers on Transwell filters.
  • Activated HPMECs with interleukin (IL)-1beta to promote intercellular adhesion molecule (ICAM)-1 expression.
  • Incubated peripheral blood eosinophils from allergic patients with HPMEC monolayers and collected migrated and nonmigrated cells for analysis.

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Main Results:

  • Transendothelial migration significantly increased eosinophil surface expression of CD69, HLA-DR, and CD54 (ICAM-1).
  • Migrated eosinophils demonstrated significantly greater in vitro survival (48h), partly mediated by granulocyte macrophage colony-stimulating factor (GM-CSF) mRNA expression.
  • Oxidative burst capacity was significantly increased in both migrated and nonmigrated eosinophils compared to controls.

Conclusions:

  • Transendothelial migration potentiates eosinophil receptor expression and survival.
  • The process of transendothelial migration plays a selective role in shaping the final phenotype of airway eosinophils in asthma.