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The effects of manno-1-deoxynojirimycin (ManDJN) and 2,5-dihydroxymethyl-3,4-dihydroxypyrrolidine (DMDP) were compared in IEC-6 intestinal epithelial cells in culture. ManDJN caused complete inhibition of N-linked complex oligosaccharide synthesis whereas a maximum of 80% inhibition was obtained with DMDP. HPLC showed similar endo H-sensitive oligosaccharides for control and treated cells. ManDJN caused a large increase in the levels of labeled Man7-9 GlcNAc and a decrease in Man5GlcNAc. DMDP produced similar changes except that the increase in Man7-9GlcNAc was less pronounced and some increase in glucosylated oligosaccharides was observed. Since the major oligosaccharides found in DMDP-treated cells were non-glucosylated, its primary effect on complex oligosaccharide synthesis is not due to inhibition of glucosidases, in contrast to what has been reported for influenza virus-infected MDCK cells [(1984) J. Biol. Chem. 259, 12409-12413].
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