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- W2016085979 abstract "Hepatic stellate cell activation is a main feature of liver fibrogenesis. We have previously shown that phagocytosis of apoptotic bodies by stellate cells induces procollagen α1 (I) and transforming growth factor beta (TGF-β) expression in vitro. Here we have further investigated the downstream effects of phagocytosis by studying NADPH oxidase activation and its link to procollagen α1 (I) and TGF-β1 expression in an immortalized human stellate cell line and in several models of liver fibrosis. Phagocytosis of apoptotic bodies in LX-1 cells significantly increased superoxide production both in the extracellular and intracellular milieus. By confocal microscopy of LX-1 cells, increased intracellular reactive oxygen species (ROS) were detected in the cells with intracellular apoptotic bodies, and immunohistochemistry documented translocation of the NADPH oxidase p47phox subunit to the membrane. NADPH oxidase activation resulted in upregulation of procollagen α1 (I); in contrast, TGF-β1 expression was independent of NADPH oxidase activation. This was also confirmed by using siRNA to inhibit TGF-β1 production. In addition, with EM studies we showed that phagocytosis of apoptotic bodies by stellate cells occurs in vivo. In conclusion, these data provide a mechanistic link between phagocytosis of apoptotic bodies, production of oxidative radicals, and the activation of hepatic stellate cells. (HEPATOLOGY 2006;43:435–443.)" @default.
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- W2016085979 date "2006-03-01" @default.
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- W2016085979 title "Phagocytosis of apoptotic bodies by hepatic stellate cells induces NADPH oxidase and is associated with liver fibrosis<i>in vivo</i>" @default.
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- W2016085979 doi "https://doi.org/10.1002/hep.21093" @default.
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