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• W2107415361 abstract "Background— The mechanisms of atherosclerotic plaque rupture are poorly understood. Urokinase-type plasminogen activator (uPA) is expressed at elevated levels by macrophages in advanced human plaques. Patients with evidence of increased plasminogen activation have an elevated risk of major cardiovascular events. We used atherosclerotic mice to test the hypothesis that increased macrophage uPA expression in advanced plaques would cause histological features similar to those in ruptured human plaques. Methods and Results— Bone marrow from transgenic mice with increased macrophage uPA expression or nontransgenic controls (all apolipoprotein E–null [ Apoe −/− ]) was transplanted into 35-week-old Apoe −/− recipients, and innominate lesions and aortas were examined 8 to 13 weeks later. Donor macrophages accumulated in innominate lesions adjacent to plaque caps and in aortas, increasing uPA expression at both sites. Recipients of uPA-overexpressing macrophages had an increased prevalence of intraplaque hemorrhage (61% versus 13%; P =0.002) as well as increased lesion fibrin staining and fibrous cap disruption ( P =0.06 for both). Transplantation of uPA-overexpressing macrophages increased aortic matrix metalloproteinase activity (40%; P =0.02). This increase was independent of matrix metalloproteinase-9. Conclusions— In advanced plaques of Apoe −/− mice, macrophage uPA overexpression causes intraplaque hemorrhage and fibrous cap disruption, features associated with human plaque rupture. uPA overexpression also increases vascular matrix metalloproteinase activity. These data provide a mechanism that connects macrophage uPA expression, matrix metalloproteinase activity, and plaque rupture features in mice. The data also suggest that elevated plaque plasminogen activator expression and plasminogen activation in humans may be causally linked to plaque rupture and cardiovascular events." @default.
• W2107415361 created "2016-06-24" @default.
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• W2107415361 date "2010-04-13" @default.
• W2107415361 modified "2023-10-17" @default.
• W2107415361 title "Overexpression of Urokinase by Plaque Macrophages Causes Histological Features of Plaque Rupture and Increases Vascular Matrix Metalloproteinase Activity in Aged Apolipoprotein E–Null Mice" @default.
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• W2107415361 doi "https://doi.org/10.1161/circulationaha.109.914945" @default.
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