Biomaterial Database

Leukocyte-leukocyte interactions mediated by platelet microparticles under flow. 2000

S B Forlow, and R P McEver, and M U Nollert

School of Chemical Engineering and Materials Science, University of Oklahoma, Norman, Oklahoma 73019, USA.

Platelet microparticles (PMPs) are released from activated platelets and express functional adhesion receptors, including P-selectin, on their surface. PMP concentrations are elevated in many disorders, and their role in accelerating coagulation has been studied. However, their role in leukocyte aggregation has not been defined. We hypothesized that P-selectin-expressing PMPs bridge leukocytes that express P-selectin glycoprotein ligand-1 (PSGL-1), thereby allowing them to interact under flow conditions. PMPs were isolated from platelet-rich plasma or were generated by activating washed platelets with calcium ionophore. PMPs increased transient adhesion of flowing HL-60 cells or neutrophils to HL-60 cells or neutrophils prebound to the surface of a parallel plate flow chamber. Homotypic neutrophil interactions are initiated by the binding of L-selectin to PSGL-1. However, even when L-selectin function was blocked, PMPs allowed flowing neutrophils to aggregate and to interact with PSGL-1-expressing cells prebound to the surface of the flow chamber. The microparticle-mediated cell interactions occurred at lower shear stresses than those mediated by L-selectin. PMPs may enhance leukocyte aggregation and leukocyte accumulation on selectin-expressing substrates, especially in diseases where the concentration of the particles is elevated. (Blood. 2000;95:1317-1323)

UI	MeSH Term	Description	Entries
D008562	Membrane Glycoproteins	Glycoproteins found on the membrane or surface of cells.	Cell Surface Glycoproteins,Surface Glycoproteins,Cell Surface Glycoprotein,Membrane Glycoprotein,Surface Glycoprotein,Glycoprotein, Cell Surface,Glycoprotein, Membrane,Glycoprotein, Surface,Glycoproteins, Cell Surface,Glycoproteins, Membrane,Glycoproteins, Surface,Surface Glycoprotein, Cell,Surface Glycoproteins, Cell
D009504	Neutrophils	Granular leukocytes having a nucleus with three to five lobes connected by slender threads of chromatin, and cytoplasm containing fine inconspicuous granules and stainable by neutral dyes.	LE Cells,Leukocytes, Polymorphonuclear,Polymorphonuclear Leukocytes,Polymorphonuclear Neutrophils,Neutrophil Band Cells,Band Cell, Neutrophil,Cell, LE,LE Cell,Leukocyte, Polymorphonuclear,Neutrophil,Neutrophil Band Cell,Neutrophil, Polymorphonuclear,Polymorphonuclear Leukocyte,Polymorphonuclear Neutrophil
D001792	Blood Platelets	Non-nucleated disk-shaped cells formed in the megakaryocyte and found in the blood of all mammals. They are mainly involved in blood coagulation.	Platelets,Thrombocytes,Blood Platelet,Platelet,Platelet, Blood,Platelets, Blood,Thrombocyte
D002448	Cell Adhesion	Adherence of cells to surfaces or to other cells.	Adhesion, Cell,Adhesions, Cell,Cell Adhesions
D002450	Cell Communication	Any of several ways in which living cells of an organism communicate with one another, whether by direct contact between cells or by means of chemical signals carried by neurotransmitter substances, hormones, and cyclic AMP.	Cell Interaction,Cell-to-Cell Interaction,Cell Communications,Cell Interactions,Cell to Cell Interaction,Cell-to-Cell Interactions,Communication, Cell,Communications, Cell,Interaction, Cell,Interaction, Cell-to-Cell,Interactions, Cell,Interactions, Cell-to-Cell
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000001	Calcimycin	An ionophorous, polyether antibiotic from Streptomyces chartreusensis. It binds and transports CALCIUM and other divalent cations across membranes and uncouples oxidative phosphorylation while inhibiting ATPase of rat liver mitochondria. The substance is used mostly as a biochemical tool to study the role of divalent cations in various biological systems.	4-Benzoxazolecarboxylic acid, 5-(methylamino)-2-((3,9,11-trimethyl-8-(1-methyl-2-oxo-2-(1H-pyrrol-2-yl)ethyl)-1,7-dioxaspiro(5.5)undec-2-yl)methyl)-, (6S-(6alpha(2S,3S),8beta(R*),9beta,11alpha))-,A-23187,A23187,Antibiotic A23187,A 23187,A23187, Antibiotic
D013314	Stress, Mechanical	A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.	Mechanical Stress,Mechanical Stresses,Stresses, Mechanical
D015539	Platelet Activation	A series of progressive, overlapping events, triggered by exposure of the PLATELETS to subendothelial tissue. These events include shape change, adhesiveness, aggregation, and release reactions. When carried through to completion, these events lead to the formation of a stable hemostatic plug.	Activation, Platelet,Activations, Platelet,Platelet Activations
D018922	HL-60 Cells	A promyelocytic cell line derived from a patient with ACUTE PROMYELOCYTIC LEUKEMIA. HL-60 cells lack specific markers for LYMPHOID CELLS but express surface receptors for FC FRAGMENTS and COMPLEMENT SYSTEM PROTEINS. They also exhibit phagocytic activity and responsiveness to chemotactic stimuli. (From Hay et al., American Type Culture Collection, 7th ed, pp127-8)	HL60 Cells,Cell, HL60,Cells, HL60,HL 60 Cells,HL-60 Cell,HL60 Cell