Exogenous eosinophil activation converts PSGL-1-dependent binding to CD18-dependent stable adhesion to platelets in shear flow

Owen J T McCarty, Niven Tien, Bruce S. Bochner, K Konstantopoulos

Research output: Contribution to journalArticle

Abstract

This study examined the binding kinetics and molecular requirements of eosinophil adhesion to surface-anchored platelets in shear flow. P-selectin glycoprotein ligand-1 (PSGL-1) binding to platelet P-selectin initiates tethering and rolling of eosinophils to platelets under flow. These primary interacting cells assist in the capture of free-flowing eosinophils through homotypic tethering (secondary interactions) mediated via L-selectin-PSGL-1 interactions. Differences between eosinophils and neutrophils in PSGL-1 and L-selectin expression levels predict the pattern and relative extent of their adhesive interactions with immobilized platelets under shear, as well as the relative magnitude of their average rolling velocities. The majority of tethered eosinophils become rapidly stationary on the platelet layer, a process that is predominantly mediated via eosinophil PSGL-1 binding to platelet P-selectin and has an absolute requirement for intact cytoskeleton. Only a small fraction of these stationary eosinophils develop shear-resistant attachments mediated by CD18 integrins. However, stimulation of eosinophils with eotaxin-2 converts PSGL-1-P-selectin-dependent stationary adhesion to CD18-mediated shear-resistant stable attachment. These studies provide insights for designing strategies based on blocking of eosinophil-platelet interactions to combat thrombotic disorders in hypereosinophilic patients.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Cell Physiology
Volume284
Issue number5 53-5
StatePublished - May 1 2003

Fingerprint

Shear flow
Platelets
Eosinophils
Blood Platelets
Adhesion
Chemical activation
P-Selectin
L-Selectin
Chemokine CCL24
Combat Disorders
P-selectin ligand protein
Integrins
Adhesives
Cytoskeleton
Neutrophils
Kinetics

Keywords

  • CD18-integrins
  • Eosinophil
  • P-selectin
  • Platelet
  • Shear stress

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Cell Biology
  • Physiology

Cite this

Exogenous eosinophil activation converts PSGL-1-dependent binding to CD18-dependent stable adhesion to platelets in shear flow. / McCarty, Owen J T; Tien, Niven; Bochner, Bruce S.; Konstantopoulos, K.

In: American Journal of Physiology - Cell Physiology, Vol. 284, No. 5 53-5, 01.05.2003.

Research output: Contribution to journalArticle

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