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Studies of Lewis antigens and H. pylori adhesion in CHO cell lines engineered to express Lewis b determinants.

Artikel i vetenskaplig tidskrift
Författare Jonas Löfling
Mette Diswall
Sara Eriksson
Thomas Borén
Michael Breimer
Jan Holgersson
Publicerad i Glycobiology
Volym 18
Nummer/häfte 7
Sidor 494-501
ISSN 1460-2423
Publiceringsår 2008
Publicerad vid Institutionen för biomedicin, avdelningen för klinisk kemi och transfusionsmedicin
Institutionen för kliniska vetenskaper
Sidor 494-501
Språk en
Länkar dx.doi.org/10.1093/glycob/cwn030
Ämnesord Animals, Bacterial Adhesion, CHO Cells, Cricetinae, Cricetulus, Glycosyltransferases, genetics, metabolism, Helicobacter pylori, physiology, Lewis Blood-Group System, biosynthesis, genetics, Oligosaccharides, biosynthesis, genetics, Protein Processing, Post-Translational
Ämneskategorier Klinisk immunologi

Sammanfattning

Many microbes bind and adhere via adhesins to host cell carbohydrates as an initial step for infection. Therefore, cell lines expressing Lewis b (Le(b)) determinants were generated as a potential model system for Helicobacter pylori colonization and infection, and their expression of blood group Lewis determinants was characterized. CHO-K1 cells were stably transfected with selected glycosyltransferase cDNAs, and two Le(b) positive clones, 1C5 and 2C2, were identified. Expression of Lewis (Le(a), Le(b), Le(x), and Le(y)) determinants was analyzed by flow cytometry of intact cells, SDS-PAGE/Western blot of solubilized glycoproteins, and thin layer chromatography immunostaining of isolated glycolipids (GL). Binding of H. pylori to cells was examined by microscopy and quantified. Flow cytometry showed that 1C5 and 2C2 were Le(a) and Le(b) positive. 1C5 expressed Le(b) on O-linked, but not N-linked, glycans and only weakly on GLs. In contrast, 2C2 expressed Le(b) on N-, O-glycans, and GLs. Furthermore, both clones expressed Le(a) on N- and O-glycans but not on GLs. 2C2, but not 1C5, stained positively for Le(y) on N-linked glycans and GLs. Both clones, as well as the parental CHO-K1 cells, expressed Le(x) on GLs. A Le(b)-binding H. pylori strain bound to the 1C5 and 2C2 cells. In summary, two glycosyltransferase transfected CHO-K1 cell clones differed regarding Lewis antigen expression on N- and O-linked glycans as well as on GLs. Both clones examined supported adhesion of a Le(b)-binding H. pylori strain and may thus be a useful in vitro model system for H. pylori colonization/infection studies.

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