title: Release of histamine in whole blood by oxygen radicals: division between specific and unspecific processes.
abstract: Oxygen derived free radicals are involved in many pathological processes such as postischemic reperfusion injuries, hepatotoxicity of drugs and inflammatory processes. Thereby these oxygen radicals induce lipid peroxidation and perturbation of cellular membranes. The aim of our present study was to determine whether oxygen radicals generated by the xanthine oxidase/ hypoxanthine system cause a release of histamine in human blood cell cultures. Stimulation of blood cell cultures with oxygen radicals induced a histamine liberation which was mainly due to calcium independent processes during the first 30 min, whereas then calcium requiring processes took part in the release of histamine. The regulation of the leukocyte selection LECAM-1 was altered by oxygen radicals whereas histamine, which is known to modulate vascular selectin expression, did not affect the expression of LECAM-1. Our data indicate that oxygen radicals induce a direct calcium independent release of histamine which is due to membrane pertubating processes during the first phase but also induce a specific reaction leading to a further indirect histamine liberation which is probably mediated by PAF.
authors.affiliation: Department of General Surgery, University of Ulm, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Poch
authors.forename: F
authors.initials: F
authors.lastname: Gansauge
authors.forename: S
authors.initials: S
authors.lastname: Gansauge
authors.forename: T
authors.initials: T
authors.lastname: Anger
authors.forename: U
authors.initials: U
authors.lastname: Nilsson
authors.forename: M H
authors.initials: MH
authors.lastname: Schoenberg
authors.forename: H G
authors.initials: HG
authors.lastname: Beger
mesh_terms: D015815:Cell Adhesion Molecules / Q000378:metabolism; D004578:Electron Spin Resonance Spectroscopy; D019084:Fluorescent Antibody Technique, Indirect; D006098:Granulocytes / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D006632:Histamine / Q000097:blood; D006636:Histamine Release / Q000187:drug effects*; D006801:Humans; D019271:Hypoxanthine / Q000494:pharmacology; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D019041:L-Selectin / Q000378:metabolism; D009000:Monocytes / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D010972:Platelet Activating Factor / Q000494:pharmacology; D017382:Reactive Oxygen Species; D019097:Spin Trapping; D014969:Xanthine Oxidase / Q000378:metabolism
chemical_list: D015815:Cell Adhesion Molecules; D010972:Platelet Activating Factor; D017382:Reactive Oxygen Species; D019041:L-Selectin; D019271:Hypoxanthine; D006632:Histamine; D007770:L-Lactate Dehydrogenase; D014969:Xanthine Oxidase