Neutrophil-platelet adhesion: relative roles of platelet P-selectin and neutrophil beta2 (DC18) integrins

American Journal of Respiratory Cell and Molecular Biology
K K BrownG S Worthen

Abstract

Neutrophils and platelets interact both physically and metabolically during inflammation and thrombosis, but the mechanisms responsible for their adhesion remain incompletely understood. Neutrophil-platelet adhesion was measured after specific stimulation of neutrophils, platelets, or both and quantified by flow cytometry. Specific stimulation of either the neutrophil or the platelet led to a marked increase in the percentage of neutrophils that bound platelets, although platelet stimulation led to a large increase and neutrophil stimulation to only a small increase in the number of platelets per neutrophil. Stimulation of both cells further increased the number of neutrophil-platelet adhesive events and led to large numbers of platelets binding to each neutrophil. Confirming previous observations, blocking antibodies to platelet P-selectin (CD62P) partially inhibited adhesion. However, blockade of the neutrophil beta2 integrin CD11b/CD18 also inhibited the percentage of neutrophils that bound platelets. Combining P-selectin and CD11b/18 blockade further inhibited the stimulated increase in the percentage of neutrophils binding platelets and the increased number of platelets per neutrophil. Both cell adhesion molecules were act...Continue Reading

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