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• W2034453401 abstract "Pulmonary hypertension and vascular remodeling processes are associated with oxidative stress, hypoxia and enhanced levels of thrombin and vascular endothelial growth factor (VEGF). The hypoxia-inducible transcription factor HIF regulates the expression of VEGF under hypoxia. The HIF pathway is also activated by thrombin or CoCl2, likely via reactive oxygen species (ROS). In this study we investigated whether the redox-modifying enzymes superoxide dismutase (SOD), glutathione peroxidase (GPX) and catalase affect HIF levels and the expression of VEGF mRNA in pulmonary artery smooth muscle cells (PASMC). Stimulation of PASMC with thrombin or CoCl2 increased ROS production and enhanced HIFα protein and VEGF mRNA levels as well as HIFdependent reporter gene activity. These responses were inhibited by vitamin C and by overexpression of GPX and catalase, whereas the opposite effects were observed in SOD-expressing cells. These findings suggest that an antioxidant state with reduced levels of H2O2 limits the activation of the HIF pathway, whereas a prooxidant state allowing elevated H2O2 levels promotes it. Thus, shifting the redox balance to a more reduced environment, thereby limiting VEGF expression, may be beneficial for treating remodeling processes during pulmonary hypertension." @default.
• W2034453401 created "2016-06-24" @default.
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• W2034453401 date "2004-01-13" @default.
• W2034453401 modified "2023-09-23" @default.
• W2034453401 title "Redox-sensitive regulation of the HIF pathway under non-hypoxic conditions in pulmonary artery smooth muscle cells" @default.
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• W2034453401 doi "https://doi.org/10.1515/bc.2004.019" @default.
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