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. 1992 Aug;60(8):3416–3422. doi: 10.1128/iai.60.8.3416-3422.1992

Roles of the pap- and prs-encoded adhesins in Escherichia coli adherence to human uroepithelial cells.

I Johanson 1, R Lindstedt 1, C Svanborg 1
PMCID: PMC257329  PMID: 1353483

Abstract

In this study, we reexamined the structural prerequisites for the attachment of P-fimbriated Escherichia coli to human urinary tract epithelial cells. The epithelial cells were obtained from A1P1 nonsecretor individuals, who express the globoseries of glycolipids without the ABH blood group determinants, and from A1P1 secretor individuals, who in addition express globo-A, a receptor for the prsJ96 adhesin. The wild-type E. coli strains J96, AD110, and IA2 and the recombinant clones HB101 papJ96, HB101 prsJ96, HB101 papIA2, and HB101 papAD110 were tested for binding. They expressed P fimbriae, as defined by P blood group-dependent agglutination of human erythrocytes of the globoseries, but differed in reactivity with galactose alpha 1-4galactose beta (Gal alpha 1-4Gal beta)-latex beads, isolated glycolipids of the globoseries, sheep erythrocytes, and uroepithelial cells. Three different patterns of binding were represented among the recombinant clones. HB101 papIA2 and HB101 papAD110 agglutinated sheep erythrocytes and Gal alpha 1-4Gal beta-latex beads and attached to both secretor and nonsecretor epithelial cells. HB101 prsJ96 agglutinated sheep erythrocytes, reacted poorly with Gal alpha 1-4Gal beta-latex beads, and attached to A1 secretor but not to A1 nonsecretor epithelial cells. HB101 papJ96 agglutinated Gal alpha 1-4Gal beta-latex beads but not sheep erythrocytes and attached poorly to human uroepithelial cells. The receptors relevant for adhesion were analyzed by inhibition with glycolipids in suspension. The sheep erythrocyte agglutination and attachment to secretor and nonsecretor epithelial cells of HB101 papIA2 and HB101 papAD110 were inhibited by globotetraosylceramide, while the Forssman glycolipid had no effect. The sheep erythrocyte reactivity and attachment to secretor epithelial cells of HB101 prsJ96 were inhibited by the Forssman glycolipid. These results permitted three conclusions. First, the expression of functionally active Gal alpha 1-4Gal beta-specific adhesins, as in HB101 papJ96, was not sufficient to make E. coli competent to attach to human uroepithelial cells. Attachment required P fimbriae of the papIA2 or papAD110 type. Second, the sheep erythrocyte reactivity of P-fimbriated strains could not be attributed solely to recognition of the Forssman glycolipid and may not be used to define the prsJ96-encoded phenotype. Third, the P-fimbrial adhesins which mediate secretor state-independent attachment to human uroepithelial cells recognized receptor epitopes provided by globotetraosylceramide.

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Selected References

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