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- W2414734864 abstract "Several serine proteases are directly cytotoxic. We investigated whether the cytotoxic effects of proteases are associated with increased levels of reactive oxygen species (ROS) in cells. We found that treatment of lung fibroblasts or bronchial epithelial cells with relatively high concentrations (0.1--100 U/ml) of neutrophil elastase, trypsin, and Pronase increased ROS levels in the mitochondria and cytoplasm. The protease-induced increase in ROS was associated with oxidative cellular injury as determined by generation of 8-hydroxy-2'-deoxyguanosine and malonaldehyde plus 4-hydroxyalkenal. The protease-induced increase in ROS was not merely due to cell detachment because the proteases also caused an increase in ROS in suspended cells, which precluded attachment to the extracellular matrix. The protease-induced increase in ROS appears to contribute to cytotoxicity because cell death induced by proteases was attenuated by treatment with catalase, a decomposer of H(2)O(2), and accelerated by treatment with aminotriazole, a catalase inhibitor. These results suggest that several proteases increase oxidative stress, indicating a direct interaction between proteases and ROS in mediating cytotoxicity." @default.
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- W2414734864 date "2001-09-01" @default.
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- W2414734864 title "Serine proteases increase oxidative stress in lung cells" @default.
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- W2414734864 doi "https://doi.org/10.1152/ajplung.2001.281.3.l556" @default.
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