Simultaneous inhibition of multiple steps in the processing of N-linked oligosaccharides does not impair immunoglobulin secretion from rat hybridoma cells

Hashim, Onn Haji and Cushley, W. (1988) Simultaneous inhibition of multiple steps in the processing of N-linked oligosaccharides does not impair immunoglobulin secretion from rat hybridoma cells. Immunology, 63 (3). pp. 383-388. ISSN 0019-2805

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Abstract

The effects of inhibiting selected pairs of oligosaccharide-processing activities upon the secretion of IgM and IgG molecules have been investigated. In the presence of castanospermine (CSP) plus swainsonine (SW) or deoxynojirimycin (dNM) plus deoxymannojirimycin (dMM), secretion of IgM and IgG from rat hybridoma cells was unimpaired relative to control cultures. The structures of the N-linked oligosaccharides found on the Ig heavy chains isolated from treated cells or culture supernatants were shown to be qualitatively different from those associated with control Ig by persistent sensitivity to digestion by endo H. Furthermore, the electrophoretic mobilities of mu and gamma chains on SDS-PAGE derived from treated cells were consistently slower than those of control heavy chains. IgM and IgG were also efficiently secreted when all glucosidase and mannosidase activities were blocked, and the secreted heavy chains bore endo H-sensitive oligosaccharides. The data suggest that Ig secretion from hybridomas can proceed in the absence of N-linked oligosaccharide processing.

Item Type: Article
Additional Information: Department of Molecular Medicine, Faculty of Medicine Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA ---> HASHIM, OH CUSHLEY, W - Correspondence: Dr W. Cushley, Dept. of Biochemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
Uncontrolled Keywords: Molecular Medicine
Subjects: R Medicine
Divisions: Faculty of Medicine
Depositing User: Ms Haslinda Lahuddin
Date Deposited: 11 Jul 2012 02:08
Last Modified: 24 Oct 2019 08:18
URI: http://eprints.um.edu.my/id/eprint/3454

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