Carbohydrate carriers affect adhesion of H. pylori to immobilized Leb-oligosaccharide

The present study involved comparison of adhesion of Helicobacter pylori KH202 to immobilized Le(b)-oligosaccharide carried on different carriers, i.e. Leb-oligosaccharide conjugated with polyacrylamide, bovine serum albumin, and dipalmitoylphosphatidylethanolamine (Le(b)-PAA, Le(b)-BSA, and Le(b)-DPPE). All of the Le(b)-oligosaccharide-carrying neoglycoconjugates served as ligands for H. pylori. However, H. pylori required 10-fold and 100-fold quantities of Le(b)-antigen to adhere to Le(b)-PAA and to Le(b)-DPPE in comparison to the quantity of Le(b)-antigen needed to adhere to Le(b)-BSA, respectively. H. pylori adhesion to Le(b)-PAA and Le(b)-DPPE was clearly inhibited by Le(b)-oligosaccharide, but adhesion to Le(b)-BSA was hardly inhibited by the oligosaccharide. Therefore, the carbohydrate carrier affects the affinity of H. pylori KH202 toward Le(b)-antigen, although the bacteria recognize Le(b)-antigen regardless of the carbohydrate carrier.