title: Interferon-gamma modulates the fibrinolytic response in cultured human endothelial cells.
abstract: The fibrinolytic potential of the endothelial cells gives important antithrombotic properties to the vascular wall. Thrombosis is a frequent complication to atherosclerosis and other conditions where inflammatory mediators are present in the vascular wall. Inflammatory agents like lipopolysaccharide (LPS) and tumor necrosis factor-alpha (TNF alpha) have been demonstrated to modulate the expression of fibrinolytic factors in cultured endothelial cells. In the present study the expression of tissue-type plasminogen activator (t-PA), urokinase plasminogen activator (u-PA) and plasminogen activator inhibitors-1 and -2 (PAI-1 and PAI-2) antigen in conditioned medium from cultured human umbilical vein (HUVEC) and human saphenous vein (HSVEC) endothelial cells was investigated under basal conditions and after stimulation with LPS, TNF alpha, interferon-gamma (IFN-gamma) or interleukin-6 (IL-6) alone or in combinations. Stimulation with LPS or TNF alpha increased the expression of PAI-1, u-PA and PAI-2 in HUVEC and HSVEC, while the t-PA response differed between the two cell types. The effects of TNF alpha were modulated by IFN-gamma but not by IL-6. The increased expression of u-PA after stimulation with TNF alpha was reduced by IFN-gamma. In contrast, TNF alpha-induced expression of PAI-2 was synergistically increased by addition of IFN-gamma. These effects of IFN-gamma represent additional mechanisms by which inflammatory mediators may turn the fibrinolytic potential of the endothelium in a prothrombotic direction.
authors.affiliation: Department of Surgery, Sahlgrenska University Hospital, University of Göteborg, Sweden.
authors.forename: V
authors.initials: V
authors.lastname: Arnman
authors.forename: S
authors.initials: S
authors.lastname: Stemme
authors.forename: L
authors.initials: L
authors.lastname: Rymo
authors.forename: B
authors.initials: B
authors.lastname: Risberg
mesh_terms: D000328:Adult; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007231:Infant, Newborn; D007371:Interferon-gamma / Q000494:pharmacology*; D015850:Interleukin-6 / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D010960:Plasminogen Activators / Q000187:drug effects / Q000378:metabolism*; D015849:Plasminogen Inactivators / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D014471:Umbilical Veins / Q000166:cytology
chemical_list: D015850:Interleukin-6; D008070:Lipopolysaccharides; D015849:Plasminogen Inactivators; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma; D010960:Plasminogen Activators