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• W2048607539 abstract "Intimal hyperplasia and subsequent thrombotic occlusions limit the success of vascular reconstructive procedures. Plasminogen activation in situ may be an important factor affecting re-stenosis of the graft. Tissue specimens from eight patients with failing or failed infra-inguinal vein bypasses and three specimens from normal veins were harvested to study urokinase-type plasminogen activator (u-PA), tissue-type plasminogen activator (t-PA) and plasminogen activator inhibitor-1 (PAI-1) by in situ hybridization and immunohistochemistry. The possible presence of thrombi was monitored by platelet and fibrin-specific stainings. In occluded grafts, platelet endothelial cell adhesion molecule (PECAM-1) antibody stained the thrombi but not the endothelial area, indicating the absence of endothelium. Platelet glycoprotein (GP) IIb/IIIa co-localized with PECAM-1 and, furthermore, GP IIb/IIIa staining was positive on the vein walls with thrombi and to some extent in the grafts without thrombi. PAI-1 and u-PA were uniformly upregulated in intimal thickening in grafts without thrombus. In organized thrombi, enhanced u-PA, t-PA and PAI-1 reactivity was detected in the ingrowing subendothelium. In non-occluded grafts with small thrombi, u-PA expression was enriched beneath microthrombi co-localizing with the graft wall injury, while PAI-1 was scattered in the (sub)endothelium. We conclude that fibrinolytic system is upregulated at sites of graft stenosis, and local proteolytic degradation of the graft wall associates with thrombus formation." @default.
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• W2048607539 date "2003-06-01" @default.
• W2048607539 modified "2023-10-05" @default.
• W2048607539 title "Urokinase, tissue-type plasminogen activator and plasminogen activator inhibitor-1 expression in severely stenosed and occluded vein grafts with thrombosis" @default.
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• W2048607539 doi "https://doi.org/10.1097/00001721-200306000-00008" @default.
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