Monocyte Chemoattractant Protein-1 and 5-Lipoxygenase Products Recruit Leukocytes in Response to Platelet-Activating Factor-Like Lipids in Oxidized Low-Density Lipoprotein
Autor: | Stephen M. Prescott, Guy A. Zimmerman, Adriana R. Silva, Hugo C. Castro-Faria-Neto, Gopal K. Marathe, Lara F. C. Caiado, Edson F. Assis, Patrícia T. Bozza, Marcelo T. Bozza, Thomas M. McIntyre |
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Rok vydání: | 2002 |
Předmět: |
Chemokine
Neutrophils Immunology Lactones Mice chemistry.chemical_compound Cell Movement In vivo Leukocytes medicine Animals Humans Immunology and Allergy RNA Messenger Platelet Activating Factor Receptor Pleurisy Chemokine CCL2 Phospholipids Inflammation Arachidonate 5-Lipoxygenase biology Platelet-activating factor Monocyte Chemotaxis respiratory system Molecular biology Eosinophils Lipoproteins LDL Pleural Effusion Disease Models Animal Ginkgolides medicine.anatomical_structure Biochemistry chemistry Arachidonate 5-lipoxygenase biology.protein lipids (amino acids peptides and proteins) Chemokines Diterpenes Lipoprotein |
Zdroj: | The Journal of Immunology. 168:4112-4120 |
ISSN: | 1550-6606 0022-1767 |
Popis: | Oxidized low-density lipoprotein (LDL) contains inflammatory agents, including oxidatively fragmented phospholipids that activate the platelet-activating factor (PAF) receptor, but in vivo events caused by these pathologically generated agents are not well defined. Injection of PAF-like lipids derived from oxidized LDL, or C4-PAF that is a major PAF-like lipid in these particles, into the pleural cavity of mice resulted in rapid monocyte, neutrophil, and eosinophil accumulation. Increased numbers of intracellular lipid bodies in these cells show they were in an inflammatory environment. Leukocyte recruitment was abolished by a PAF receptor antagonist, as expected. PAF-like lipids induced 5-lipoxygenase expression in leukocytes, mRNA expression for monocyte chemoattractant protein-1 (MCP-1) and other chemokines, synthesis of MCP-1, and leukotriene B4. The 5-lipoxygenase inhibitor zileuton impaired neutrophil influx, while MCP-1 had a more global role, as determined with MCP-1−/− mice. The lack of MCP-1 abrogated leukocyte accumulation and lipid body formation both in vivo and in vitro and chemokine transcription in vivo, and reduced in vivo leukotriene B4 production. Thus, PAF-like phospholipids in oxidized LDL induce an inflammatory infiltrate through the PAF receptor, chemokine transcription, lipid body formation, and 5-lipoxygenase expression in leukocytes. MCP-1 has a key role in this inflammatory response, and 5-lipoxygenase products are essential for neutrophil recruitment into the inflamed pleural cavity. |
Databáze: | OpenAIRE |
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