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Adhesion of platelets to chemotactically responsive and non-responsive neutrophils
  1. K B Pastakia,
  2. N E Brownson,
  3. D A Terle,
  4. L Harvath
  1. Laboratory of Cellular Hematology, Division of Hematology, Center for Biologic Evaluation and Research, Food and Drug Administration, Bethesda, Maryland, USA


    Aims—To investigate the heterotypic adhesion of unactivated platelets to chemotactically responsive (migrated) and non-responsive (non-migrated) polymorphonuclear neutrophils (PMN).

    Methods—Platelets and PMN were isolated from autologous, normal blood. Migrated and non-migrated PMN were separated after N-formylmethionyl-leucylphenylalanine (FMLP) stimulation. Platelets were labelled with a fluorescent monoclonal antibody directed against CD41 (GPIIb-IIIa). Platelets (3 × 108/ml) and PMN (3 × 106/ml) were incubated together. Heterotypic cell adhesion was measured in isolated PMN and PMN co-incubated with platelets by flow cytometric analysis of platelet marker fluorescence in PMN gated events. Platelet-PMN adhesion was also visualised by fluorescence microscopy.

    Results—In studies of isolated PMN, contaminating platelets were bound to 16-34% of unstimulated PMN, 7-22% of stimulated PMN, 2-4% of migrated PMN, and 17-24% of non-migrated PMN. When platelets were co-incubated with migrated or non-migrated PMN, 15-78% of PMN bound one or two platelets.

    Conclusions—Unactivated platelets adhere to isolated PMN in vitro. Fewer unactivated platelets were adhered to migrated PMN than to non-migrated PMN in isolated PMN preparations. These results indicate that platelets adhering to PMN are removed during PMN migration.

    • platelets
    • neutrophils
    • migrate

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