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- W2017464562 abstract "The role of glycosylation of the transforming growth factor-β1 (TGF-β1) precursor was investigated by treating a transfected Chinese hamster ovary (CHO) cell line expressing high levels of recombinant TGF-β1 (TGF-β3-2000 cells) with a series of glycosylational inhibitors. Tunicamycin, a nucleoside anti-biotic which prevents the formation of the dolichol intermediate necessary for oligosaccharide addition of the nascent polypeptide chain, appeared to block secretory exit and led to an increase in the cellular associated, nonglycosylated pro-TGF-β1 form. 1-Deoxymannojirimycin and swainsonine, inhibitors of the mannosidases I and II, respectively, blocked complete glycoprotein processing of the TGF-β1 precursor as judged by sodium dodecyl sulfatepolyacrylamide gel electrophoresis and by sensitivity to glycosidases. However, the abnormal TGF-β1 polypeptides containing the altered carbohydrate side chains were secreted readily by the CHO cells. In contrast, inhibitors of the glucosidases at the first step in glycoprotein remodeling, 1-deoxynojirimycin and castanospermine, markedly inhibited secretion of the TGF-β1 polypeptides from transfected CHO cells. In all cases, these inhibitors did not appear to affect proteolytic processing of the TGF-β1 polypeptides. Furthermore, inhibitor treatment did not affect mannose-6-phosphorylation of the TGF-β1 polypeptides. These results suggest that glycosylation and early stage remodeling of oligosaccharide side chains are necessary for secretion of TGF-β1. Treatment of the transfected CHO cells with weak bases (NH4CI and chloroquine), or a monovalent ionophore (monensin), prevented proteolytic processing of the TGF-β1 precursor indicating that cleavage occurs by proteases in an acidic cellular compartment." @default.
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- W2017464562 date "1989-07-01" @default.
- W2017464562 modified "2023-10-18" @default.
- W2017464562 title "Transforming Growth Factor β1: Importance of Glycosylaytion and Acidic Proteases for Processing and Secretion" @default.
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- W2017464562 doi "https://doi.org/10.1210/mend-3-7-1090" @default.
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