Adhesion of Helicobacter pylori to gastric epithelial cells in primary cultures obtained from stomachs of various animals

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Abstract
Of 35 strains of Helicobacter pylori tested, 5 were found to adhere well to HEp-2 cells. We selected three of these adhesive strains and four from the remaining strains to examine their ability to adhere to gastric epithelial cells in primary cultures obtained by collagenase digestion of stomachs from mice, rats, Mongolian gerbils, guinea pigs, pigs, and cynomolgus monkeys. The three adhesive strains adhered well to epithelial cells from monkey and pig gastric antra. The adhesion was inhibited by incubating the bacterial cells with fetuin, and this inhibition was further confirmed by the binding of gold-labeled fetuin to the surface of the adhesive strains. However, these adhesive strains only weakly adhered to fundic epithelial cells from monkeys and pigs and to gastric epithelial cells from the other animals. As for the four strains poorly adhesive to HEp-2 cells, they adhered weakly to gastric epithelial cells from all of the animals tested. They had higher hemagglutination titers than the adhesive strains, showing that there was no correlation between hemagglutination titers and the ability to adhere to gastric cells. Taking the similarities of human and monkey or pig stomachs into consideration, these results suggest that the primary target cell of H. pylori in colonization in human stomachs is the antral epithelial cell and that the putative adhesin involved in adhesion has affinity for fetuin.