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Interaction of various Entamoeba histolytica strains with human intestinal cell lines
G D Burchard1, G Prange, D Mirelman
1Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany.
Abstract:
The interaction of four pathogenic and three nonpathogenic E. histolytica strains with two human intestinal cell lines (Caco-2 and HT-29) was examined. The adherence of pathogenic and nonpathogenic E. histolytica to these cells was similar, indicating that defective adherence to intestinal cells is not a common feature of nonpathogenic strains. The addition of different carbohydrates confirmed the importance of the galactose-binding lectin of E. histolytica in binding to these intestinal cells. On the other hand, only virulent E. histolytica strains damaged monolayers of intestinal cells. The results indicate that Caco-2 cells and differentiated HT-29 cells are useful models for research of intestinal amebiasis.
Insights
Pathogenic and nonpathogenic Entamoeba histolytica strains bind similarly to intestinal cells. However, only pathogenic strains cause cell damage, highlighting virulence factors beyond adherence in amebiasis.
Area of Science:
- Microbiology
- Cell Biology
- Infectious Diseases
Background:
- Entamoeba histolytica (E. histolytica) is an enteric protozoan parasite.
- E. histolytica causes amebiasis, a significant global health concern.
- Understanding the interaction between E. histolytica and intestinal cells is crucial for amebiasis research.
Purpose of the Study:
- To investigate the adherence and damage potential of pathogenic and nonpathogenic E. histolytica strains.
- To elucidate the role of the galactose-binding lectin in E. histolytica adherence to intestinal cells.
- To evaluate the utility of Caco-2 and HT-29 cell lines as models for intestinal amebiasis.
Main Methods:
- Co-culture of four pathogenic and three nonpathogenic E. histolytica strains with Caco-2 and HT-29 intestinal cell lines.
- Assessment of parasite adherence to intestinal cell monolayers.
- Carbohydrate inhibition assays to identify binding mechanisms.
- Evaluation of intestinal cell monolayer integrity after parasite interaction.
Main Results:
- Adherence of pathogenic and nonpathogenic E. histolytica strains to intestinal cells was comparable.
- Galactose-binding lectin was confirmed as important for E. histolytica adherence.
- Only virulent E. histolytica strains induced significant damage to intestinal cell monolayers.
- Caco-2 and differentiated HT-29 cells demonstrated susceptibility to pathogenic E. histolytica.
Conclusions:
- Defective adherence is not a universal characteristic of nonpathogenic E. histolytica strains.
- Virulence of E. histolytica involves mechanisms beyond simple adherence to intestinal cells.
- Caco-2 and HT-29 cell lines serve as valuable in vitro models for studying intestinal amebiasis.