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Interaction of P-fimbriated Escherichia coli with human meconium
I Adlerberth1, C Svanborg, L A Hanson
1Department of Clinical Immunology, University of Göteborg, Sweden.
Abstract:
The ability of Escherichia coli with different receptor specificities to interact with meconium was studied. E. coli strains expressing P-fimbriae, specific for Gal alpha 1-4Gal beta-containing receptors, were agglutinated by meconium at high titres. This reaction was inhibited by globotetraosylceramide. The attachment of P-fimbriated E. coli to human colonic epithelial cells of the HT-29 cell line was inhibited by meconium. Some type 1 fimbriated strains were agglutinated by meconium, but the agglutination was rarely blocked by methyl alpha-D-mannoside. The attachment by type 1 fimbriated strains to HT-29 cells was reduced by meconium only in some cases. These results suggest that meconium interacts with the P-fimbriae of E. coli, in a way that may influence bacterial colonization of the neonatal intestine.
Insights
Meconium interacts with P-fimbriated Escherichia coli (E. coli), potentially affecting bacterial colonization in newborns. This interaction was observed to inhibit E. coli attachment to intestinal cells.
Area of Science:
- Microbiology
- Gastroenterology
- Neonatal Health
Background:
- Neonatal intestinal colonization by Escherichia coli (E. coli) is influenced by interactions with meconium.
- E. coli possesses various fimbriae (adhesions) that mediate bacterial attachment to host cells.
- Understanding these early interactions is crucial for neonatal gut health.
Purpose of the Study:
- To investigate the interaction between different E. coli strains and meconium.
- To determine if meconium can inhibit E. coli attachment to intestinal cells.
- To elucidate the role of specific E. coli fimbriae in meconium interactions.
Main Methods:
- Studied agglutination of E. coli strains with varying receptor specificities by meconium.
- Utilized globotetraosylceramide and methyl alpha-D-mannoside as inhibitors.
- Assessed the inhibition of E. coli attachment to HT-29 human colonic epithelial cells by meconium.
Main Results:
- Meconium strongly agglutinated E. coli strains expressing P-fimbriae, which bind to Gal alpha 1-4Gal beta receptors, an interaction inhibited by globotetraosylceramide.
- Meconium inhibited the attachment of P-fimbriated E. coli to HT-29 cells.
- Meconium showed weaker agglutination of type 1 fimbriated E. coli, with limited inhibition by methyl alpha-D-mannoside and reduced attachment to HT-29 cells.
Conclusions:
- Meconium specifically interacts with P-fimbriae of E. coli.
- This interaction may play a significant role in modulating bacterial colonization within the neonatal intestine.
- Further research can explore therapeutic strategies targeting these interactions for improved neonatal gut health.