Enzymatic basis for sialyl-Tn expression in human colon cancer cells View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1998-06

AUTHORS

Inka Brockhausen, Jimmy Yang, Nathalie Dickinson, Shunichiro Ogata, Steven H Itzkowitz

ABSTRACT

Sialyl-Tn antigen (SAalpha2-6 GalNAc alpha-Ser/Thr) is expressed as a cancer-associated antigen on the surface of cancer cells and its expression correlates with a poor prognosis in patients with colorectal and other adenocarcinomas. To understand the enzymatic basis of sialyl-Tn (STn) antigen expression, we used two clonal cell lines, LSB and LSC, derived from LS174T human colonic cancer cells. LSC cells express only the truncated carbohydrate antigen Tn (GalNAc alpha-Ser/Thr) and sialyl-Tn on their mucin molecules, whereas LSB cells express elongated oligosaccharide chains. Both cell lines demonstrated similar activities of glycosyltransferases involved in the biosynthesis of elongated and terminal structures of complex O-glycans. However, LSC cells were unable to synthesize core 1 (Gal beta1-3GalNAc-) because the ubiquitous enzyme activity of UDP-Gal:GalNAc-R beta3-Gal-transferase (core 1 beta3-Gal-transferase) was lacking. Core 1 beta3-Gal-transferase could not be reactivated in LSC cells by treatment with sodium butyrate or by in vivo growth of LSC cells in nude mice. In contrast, LSB cells were able to synthesize and process core 1 and core 2 (GlcNAc beta1-6 (Gal beta1-3) GalNAc-). LSC cells represent the first example of a non-hematopoietic cell line which lacks core 1 beta3-Gal-transferase activity. The lack of core 1 beta3-Gal-transferase in LSC cells explains why they are incapable of forming the common mucin O-glycan core structures and are committed to synthesizing the short Tn and STn oligosaccharides. These findings suggest that the activity of core 1 beta3-Gal-transferase is an important determinant of the STn phenotype of colon cancer cells. More... »

PAGES

595-603

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1006967910803

DOI

http://dx.doi.org/10.1023/a:1006967910803

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021341359

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/9881766


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