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- W1991501592 abstract "BACKGROUND & AIMS: Bile salt-induced apoptosis is mediated by a trypsin- like nuclear protease. The aims of this study were to identify this protease and to elucidate its mechanistic role in bile salt-induced hepatocyte apoptosis.METHODS: Rats, isolated rat hepatocytes, and a rat hepatoma cell line stably transfected with a bile salt transporter (McNtcp.24) were used for this study.RESULTS: In the bile duct-ligated rat, a threefold increase in apoptosis and a fourfold increase in trypsin-like nuclear protease activity were observed. The nuclear protease activity was purified from bile duct-ligated rats and identified as cathepsin B. Specific, structurally dissimilar cathepsin B inhibitors blocked glycochenodeoxycholate (GCDC)-induced apoptosis in cultured rat hepatocytes. Furthermore, stable transfection of McNtcp.24 cells with the complementary DNA for cathepsin B in the antisense orientation reduced cathepsin B activity and GCDC-induced apoptosis by >75%. Next, cathepsin B cellular localization during apoptosis was determined by immunoblot analysis of nuclear cell fractions, immunocytochemistry, and by determining the compartmentation of expressed cathepsin B fused to green fluorescent protein. All three approaches showed translocation of cathepsin B from the cytoplasm to the nucleus during GCDC-induced apoptosis.CONCLUSIONS: The data suggest that translocation of cathepsin B from the cytoplasm to the nucleus is a mechanism contributing to bile salt-induced apoptosis of hepatocytes.(Gastroenterology 1997 Nov;113(5):1714-26)" @default.
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- W1991501592 date "1997-11-01" @default.
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- W1991501592 title "Cathepsin B contributes to bile salt-induced apoptosis of rat hepatocytes" @default.
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- W1991501592 doi "https://doi.org/10.1053/gast.1997.v113.pm9352877" @default.
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