Different Culture Methods Lead to Differences in Glycosylation of a Murine IgG Monoclonal Antibody

Overview

Journal Biochem J

Specialty Biochemistry

Date 1992 Aug 1

PMID 1497622

Citations 22

Authors

T P Patel

R B Parekh

B J Moellering

C P Prior

Affiliations

Soon will be listed here.

Abstract

A monoclonal IgG-1 was produced by culture of a murine hybridoma (3.8.6) by three different methods, namely culture in ascites, in serum-free media and in serum-supplemented media. IgG-1 was purified to homogeneity (as judged by SDS/PAGE under reducing conditions) from each medium by ion-exchange chromatography and h.p.l.c. Protein A chromatography. Oligosaccharides were released from each IgG-1 preparation by hydrazinolysis and radiolabelled by reduction with alkaline sodium borotritide, and 'profile' analysis of the radiolabelled oligosaccharide alditols was performed by a combination of paper electrophoresis and gel-filtration chromatography. This analysis indicated clear and reproducible differences in the glycosylation patterns of the three IgG-1 preparations. Sequential exoglycosidase analysis of individual oligosaccharides derived from each IgG-1 preparation was used to define these differences. Ascites-derived material differed from serum-free-culture-derived material only with respect to the content of sialic acid. IgG-1 derived from culture in serum-containing media had an intermediate sialic acid content and a lower incidence of outer-arm galactosylation than the other two preparations. These differences in glycosylation could not be induced in any IgG-1 preparation by incubating purified IgG-1 with ascites or culture medium. It is concluded that the glycosylation pattern of a secreted monoclonal IgG is dependent on the culture method employed to obtain it.

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