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Related Experiment Videos

Migration through basement membrane modulates eosinophil expression of CD44.

M-J Dallaire1, C Ferland, S Lavigne

  • 1Unité de Recherche en Pneumologie, Centre de Recherche de Hôpital Laval, Institut Universitaire de Cardiologie et de Pneumologie de l'Université Laval, Sainte-Foy, Québec, Canada.

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
|June 6, 2002
PubMed
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Eosinophil migration through basement membranes alters cell surface markers like CD44, suggesting this process modifies eosinophil phenotype for tissue interactions. This study reveals how basement membrane passage impacts eosinophil activation and function.

Area of Science:

  • Immunology
  • Cell Biology
  • Eosinophil Function

Background:

  • Tissue eosinophils exhibit distinct phenotypes and functions compared to blood eosinophils.
  • This suggests that the migration process from blood to tissue induces significant cellular changes.

Purpose of the Study:

  • To investigate if eosinophil passage through the endothelial basement membrane alters eosinophil phenotype.
  • To evaluate the impact of trans-basement membrane migration on eosinophil surface receptor expression and mediator release.

Main Methods:

  • Utilized a previously established model of eosinophil migration through Matrigel, a basement membrane mimic.
  • Assessed changes in eosinophil expression of CD44, CD69, and HLA-DR.
  • Measured the release of peroxidase (EPO), leukotriene (LT) C(4), and granulocyte-monocyte colony stimulating factor (GM-CSF) post-migration.

Related Experiment Videos

Main Results:

  • Interleukin-5 (IL-5) alone increased CD44 and CD69 expression, while 5-oxo-6, 8, 11, 14-eicosatetraenoic acid (5-oxo-ETE) did not.
  • Trans-Matrigel migration significantly upregulated CD44 expression beyond IL-5 effects.
  • Matrigel contact decreased IL-5-induced CD69 expression, while trans-migration did not alter it.
  • No significant changes were observed in HLA-DR expression or EPO, LTC(4), and GM-CSF release.

Conclusions:

  • In vitro migration through Matrigel and direct Matrigel contact modulate eosinophil membrane receptor expression.
  • These findings suggest that basement membrane passage is a key mechanism driving phenotypic changes in activated eosinophils.
  • This process likely prepares eosinophils for subsequent interactions within the tissue environment.