title: Comparative EPR study of different macrophage types stimulated for superoxide and nitric oxide production.
abstract: Despite the major impact of ROS on human health, their quantification remains difficult and requires an analytical approach, such as the EPR spin trap technique. In this study, a comparative EPR analysis of different macrophage types stimulated for superoxide and nitric oxide production was performed. U937 monocytes, J774A.1, RAW 264.7 and primary mouse (PMM) macrophages were included. In contrast to the U937 cells, all macrophages produced significant EPR signals after stimulation. The use of PMA as stimulator and CM-H as spin probe led to the highest response in EPR signals for detection of O(2)(.-) as nitroxide radical. A combination of LPS and IFN-gamma and the spin trap [Fe(DETC)(2)] turned out to be the best combination for the production and detection of intracellular NO spin adducts. In conclusion, this study established practical experimental conditions for the EPR analysis of O(2)(.-) and NO produced by different types of activated macrophages.
authors.affiliation: University of Antwerp, Belgium.
authors.forename: Maartje
authors.initials: M
authors.lastname: Deschacht
authors.forename: Tessa
authors.initials: T
authors.lastname: Horemans
authors.forename: Wim
authors.initials: W
authors.lastname: Martinet
authors.forename: Hidde
authors.initials: H
authors.lastname: Bult
authors.forename: Louis
authors.initials: L
authors.lastname: Maes
authors.forename: Paul
authors.initials: P
authors.lastname: Cos
mesh_terms: D000818:Animals; D002460:Cell Line / Q000187:drug effects / Q000378:metabolism; D003497:Cyclic N-Oxides / Q000032:analysis; D004578:Electron Spin Resonance Spectroscopy; D004731:Endotoxins / Q000494:pharmacology; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008264:Macrophages / Q000145:classification / Q000378:metabolism*; D051379:Mice; D009569:Nitric Oxide / Q000096:biosynthesis*; D010755:Organophosphates / Q000032:analysis; D010880:Piperidines / Q000032:analysis; D011759:Pyrrolidines / Q000032:analysis; D013113:Spin Labels; D019097:Spin Trapping; D013481:Superoxides / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D020298:U937 Cells / Q000187:drug effects / Q000378:metabolism
chemical_list: C492269:1-hydroxy-3-methoxycarbonyl-2,2,5,5-tetramethylpyrrolidine; C113868:1-hydroxy-4-phosphonooxy-2,2,6,6-tetramethylpiperidine; C499782:3-carboxy-2,2,5,5-tetramethylpyrrolidin-1-yloxyl; D003497:Cyclic N-Oxides; D004731:Endotoxins; D008070:Lipopolysaccharides; D010755:Organophosphates; D010880:Piperidines; D011759:Pyrrolidines; D013113:Spin Labels; D014409:Tumor Necrosis Factor-alpha; D013481:Superoxides; D009569:Nitric Oxide; C044101:endotoxin, Escherichia coli; D007371:Interferon-gamma; D013755:Tetradecanoylphorbol Acetate