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• W2048831921 abstract "Clofibric acid (CA), a potent peroxisome proliferator (PP), has been shown to cause tumor formation in rat liver. The precise mechanism of action of PPs remains largely unknown. However, it has been proposed that they act by increasing reactive oxygen species (ROS), leading to a cellular oxidative stress. In the present study, we have investigated the effect of CA on the activator protein-1 (AP-1) expression in PP-responsive H4IIEC3 rat hepatoma cells. Electrophoretic mobility shift assays demonstrated that AP-1 activation was induced in cells treated with CA for 24 h at all concentrations of the fibrate. This activation was prolonged up to 48 h. Using transfection experiments with H4IIEC3 cells, we found that CA induced the expression of a reporter gene driven by AP-1 and that of the glutathione S-transferase P target gene. By supershift experiments, jun and fos proteins were identified as components of the CA-activated AP-1 complexes. Western blot analyses revealed that the induction of the AP-1 activity was not dependent to an increase in the levels of jun and fos proteins. Cotreatment of H4IIEC3 cells with CA and the antioxidant N-acetylcysteine or calphostin C, a specific inhibitor of protein kinase C (PKC), blocked the AP-1 activation and the expression of the AP-1-driven luciferase reporter gene. These results demonstrate that CA activates AP-1 in H4IIEC3 cells and that this induction is mediated via ROS and PKC." @default.
• W2048831921 created "2016-06-24" @default.
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• W2048831921 creator A5023328254 @default.
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• W2048831921 date "2001-08-01" @default.
• W2048831921 modified "2023-09-26" @default.
• W2048831921 title "Activation of the Activator Protein-1 by the Peroxisome Proliferator Clofibric Acid in Rat H4IIEC3 Hepatoma Cells" @default.
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• W2048831921 doi "https://doi.org/10.1006/taap.2001.9214" @default.
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• W2048831921 hasPublicationYear "2001" @default.
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