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. 1996 Feb;49(1):M17–M22. doi: 10.1136/mp.49.1.m17

Adhesion of platelets to chemotactically responsive and non-responsive neutrophils

K B Pastakia 1, N E Brownson 1, D A Terle 1, L Harvath 1
PMCID: PMC408012  PMID: 16696039

Abstract

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.

Keywords: platelets

Keywords: neutrophils

Keywords: migrate

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