title: Different effects of exogenous horseradish peroxidase on luminol-amplified chemiluminescence induced by soluble and particulate stimuli in human neutrophils.
abstract: The chemiluminescence (CL) technique with scavengers for superoxide anion (superoxide dismutase) and hydrogen peroxide (catalase) was used to characterize the generation of reactive oxygen species (ROS) inside and outside the human neutrophil after stimulation with both soluble (formyl-methionyl-leucyl-phenylalanine, FMLP) and particulate (urate crystals, zymosan, oxidized LDL) stimuli. Depending on the stimulus used, ROS generation differed in composition and absolute amounts. The ratio between extracellularly and intracellularly produced ROS ranged from 0.3 (zymosan) to 4.2 (FMLP). While enhancing substantially FMLP-stimulated CL, horseradish peroxidase inhibited CL induced by particulate stimuli by 40-80%. Furthermore, an azide-insensitive and therefore peroxidase-independent part of CL was found in FMLP-, LDL- and zymosan-stimulated cells. The results indicate that different agonists may lead through distinct chemical pathways to neutrophil luminol-amplified light generation.
authors.affiliation: Carl Gustav Carus Medical School, Technical University of Dresden, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Kopprasch
authors.forename: M
authors.initials: M
authors.lastname: Kohl
authors.forename: J
authors.initials: J
authors.lastname: Graessler
mesh_terms: D001322:Autoanalysis; D006735:Horseradish Peroxidase; D006801:Humans; D066298:In Vitro Techniques; D007700:Kinetics; D008077:Lipoproteins, LDL / Q000494:pharmacology; D008163:Luminescent Measurements; D008165:Luminol; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013481:Superoxides / Q000097:blood*; D015054:Zymosan / Q000494:pharmacology
chemical_list: D008077:Lipoproteins, LDL; D017382:Reactive Oxygen Species; C099252:oxidized low density lipoprotein; D013481:Superoxides; D009240:N-Formylmethionine Leucyl-Phenylalanine; D008165:Luminol; D015054:Zymosan; D006735:Horseradish Peroxidase