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• W2020071204 endingPage "170" @default.
• W2020071204 startingPage "159" @default.
• W2020071204 abstract "The biosynthesis of lysosomal cysteine proteases, cathepsins B and H, was investigated by using pulse-chase experiments in vivo in primary cultures of rat hepatocytes. Cathepsins B and H were isolated from either total cell extracts or culture medium labeled with [35S]methionine by immunoprecipitation and analyzed for their molecular forms. Within 60 min of chase, cellular preforms of cathepsins B of 39 kDa and H of 41 kDa were converted to single-chain form cathepsins B of 29 kDa and H of 28 kDa, respectively, and persisted as these forms even after 12-h chase periods. The proforms of cathepsins B and H derived from pulse-labeling experiments showed complete susceptibility to endoglycosidase H treatment, indicating that these proenzymes bear high-mannose-type oligosaccharides at the stage of initial events of biosynthesis. In the presence of tunicamycin, unglycosylated proenzymes of cathepsins B of 35 kDa and H of 34 kDa were found to be secreted into the extracellular medium without undergoing proteolytic processing. Furthermore, in the presence of swainsonine, a potent inhibitor of Golgi mannosidase II, considerable amounts of the proenzymes were secreted and accumulated in the medium during chasing periods. These results suggest that the oligosaccharide moiety of these enzymes would be necessary for the intracellular sorting mechanism. In monensin-treated cells, the conversion of intracellular proenzymes to mature enzymes was significantly inhibited and the proenzymes were secreted into the medium. In the presence of chloroquine or ammonium chloride, proteolytic processing of the proenzymes was completely prevented and the enhanced secretion of proenzymes was observed. These results suggest that in the presence of lysosomotropic amines the intracellular sorting of proenzymes might not occur properly during biosynthesis." @default.
• W2020071204 created "2016-06-24" @default.
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• W2020071204 date "1988-04-01" @default.
• W2020071204 modified "2023-10-18" @default.
• W2020071204 title "Biosynthesis of lysosomal cathepsins B and H in cultured rat hepatocytes" @default.
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• W2020071204 doi "https://doi.org/10.1016/0003-9861(88)90178-6" @default.
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