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• W2041232313 abstract "Elevated levels of plasma lipoprotein (a) [Lp(a)] have been considered as a strong risk factor for premature cardiovascular diseases. Plasminogen activator inhibitor-1 (PAI-1) is the major physiological inhibitor of plasminogen activators (PA). Increases in PAI-1 levels with or without a reduction in PA levels have been frequently found in coronary artery disease patients. The present paper examined the effects of oxidized Lp(a) on the production of PAI-1 in cultured human umbilical vein endothelial cells (HUVEC). Lp(a) and Lp(a)-free, low density lipoprotein (LDL) were prepared using lysine-Sepharose 4B affinity chromatography. Incubations with 10(-8) M levels of native Lp(a) moderately increased the levels of biologically active PAI-1 in post-culture medium of HUVEC compared to that with equimolar concentrations of native Lp(a)-free LDL. The release of PAI-1 induced by Lp(a) was enhanced by oxidative modification with copper ion. The stimulation of oxidized Lp(a) on PAI-1 production reached plateau in EC treated with 10-20 nM oxidized Lp(a) modified by microM CuSO4. Treatment with 0.2 micrograms/ml of actinomycin D significantly reduced native and oxidized Lp(a)-induced PAI-1 overproduction in EC. Increases in the steady state levels of PAI-1 mRNA were detected in native or oxidized Lp(a)-treated EC. The effect of Lp(a)-free oxidized LDL on PAI-1 production was significantly weaker than the equimolar amount of oxidized Lp(a) but stronger than that of native LDL. Treatments with oxidized Lp(a) increased cell-associated PAI-1 to a similar extent as that in native Lp(a)-treated EC. The results of the present paper demonstrate that oxidative modification enhances Lp(a)-induced PAI-1 production in vascular endothelial cells at RNA transcription level, which suggests that oxidization potentially amplifies the anti-fibrinolytic and thrombotic effect of Lp(a)." @default.
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• W2041232313 date "1997-01-01" @default.
• W2041232313 modified "2023-09-26" @default.
• W2041232313 title "Oxidative modification enhances lipoprotein(a)-induced overproduction of plasminogen activator inhibitor-1 in cultured vascular endothelial cells" @default.
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• W2041232313 doi "https://doi.org/10.1016/s0021-9150(96)05971-0" @default.
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