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• W2149662912 abstract "In this paper we describe the expression of the tissue plasminogen activator (tPA), urokinase-type plasminogen activator (uPA), plasminogen activator inhibitor-1 (PAI-1) and the uPA receptor (uPAR), in normal and atheromatous human vascular tissue obtained at coronary and peripheral vascular surgery. tPA, uPA, PAI-1 and uPAR antigens were localised by immunohistochemistry. Vessel homogenates were used to quantitate tPA, uPA and PAI-1 antigens as well as uPA and PAI-1 activities using immunoassay and immunoactivity assays, respectively. Quantitative reverse transcription polymerase chain reaction assays (PAI-1 and uPA) were developed and used to quantify PAI-1 and uPA mRNA. In-situ hybridisation (tPA, uPA and PAI-1) was used to localise mRNA. In normal saphenous vein or internal mammary artery, expression of tPA, uPA and PAI expression is associated with endothelium and with intimal or medial smooth muscle cells, but expression is at a low level. uPAR protein was seen on the endothelium of normal saphenous vein or internal mammary artery but absent on the smooth muscle cells. In complex atheroma tPA, uPA, PAI and uPAR proteins were associated with the endothelium, groups of smooth muscle cells (in the intima and around vascular channels, but not with the media), infiltrating mononuclear cells, and also with acellular areas. PAI-1, tPA and uPA mRNA were demonstrated in atheroma in endothelial cells and smooth muscle cells, as well as in areas rich in macrophages. In stenosing saphenous vein grafts there was strikingly increased tPA and uPA (but not PAI-1) expression in neointimal smooth muscle cells and migrating SMC at the intima/media border. A major difference between complex atheroma and either normal vessel or saphenous vein grafts was greatly increased expression of PAI-1 mRNA associated with smooth muscle cells (SMC) in the former. In spite of the greatly increased PAI-1 mRNA expression in atheromatous lesions, the immunoactivity assay showed PAI-1 activity to be low compared to normal internal mammary artery. Our findings would be compatible with previous reports implicating the plasminogen activator/inhibitor system in the initiation and control of matrix remodelling during normal and pathological vessel growth and repair, but also emphasize the complexity of this process in human vessels." @default.
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• W2149662912 date "2000-09-01" @default.
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• W2149662912 title "Expression of the plasminogen activator system in the human vascular wall" @default.
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• W2149662912 doi "https://doi.org/10.1016/s0021-9150(99)00441-4" @default.
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