Circulating platelet-neutrophil complexes are important for subsequent neutrophil activation and migration
| Autor: | Wai L. Liu, Clive P. Page, Gary Salmon, Simon C. Pitchford, Kristin N. Kornerup |
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| Rok vydání: | 2010 |
| Předmět: |
Adult
Blood Platelets Lipopolysaccharides Male Chemokine P-selectin Physiology Neutrophils Inflammation Peritonitis Neutrophil Activation Mice Young Adult Platelet Adhesiveness In vivo Physiology (medical) Platelet adhesiveness medicine Animals Humans Platelet Busulfan Cells Cultured Chemokine CCL22 Mice Inbred BALB C Membrane Glycoproteins biology Zymosan Chemotaxis Pneumonia Middle Aged Thrombocytopenia Chemotaxis Leukocyte Disease Models Animal P-Selectin Neutrophil Infiltration CD18 Antigens Immunology biology.protein Female Chemokine CCL17 medicine.symptom Bronchoalveolar Lavage Fluid Selectin |
| Zdroj: | Journal of applied physiology (Bethesda, Md. : 1985). 109(3) |
| ISSN: | 1522-1601 |
| Popis: | Previous studies in our laboratory have shown that platelets are essential for the migration of eosinophils into the lungs of allergic mice, and that this is dependent on the functional expression of platelet P-selectin. We sought to investigate whether the same is true for nonallergic, acute inflammatory stimuli administered to distinct anatomic compartments. Neutrophil trafficking was induced in two models, namely zymosan-induced peritonitis and LPS-induced lung inflammation, and the platelet dependence of these responses investigated utilizing mice rendered thrombocytopenic. The relative contribution of selectins was also investigated. The results presented herein clearly show that platelet depletion (>90%) significantly inhibits neutrophil recruitment in both models. In addition, we show that P-selectin glycoprotein ligand-1, but not P-selectin, is essential for neutrophil recruitment in mice in vivo, thus suggesting the existence of different regulatory mechanisms for the recruitment of leukocyte subsets in response to allergic and nonallergic stimuli. Further studies in human blood demonstrate that low-dose prothrombotic and pro-inflammatory stimuli (CCL17 or CCL22) synergize to induce platelet and neutrophil activation, as well as the formation of platelet-neutrophil conjugates. We conclude that adhesion between platelets and neutrophils in vivo is an important event in acute inflammatory responses. Targeting this interaction may be a successful strategy for inflammatory conditions where current therapy fails to provide adequate treatment. |
| Databáze: | OpenAIRE |
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