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Inhibitory activity of saccharomyces yeasts on the adhesion ofEntamoeba histolytica trophozoites to human erythrocytes in vitro

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Abstract

Adhesion to target cells represents the first step in infection byEntamoeba histolytica. Binding of axenic amoeba (HMI strain) to human red cells in vitro was employed as a model of the adhesion process. The influence of precontact of trophozoites with suspensions of liveSaccharomyces boulardii yeasts, their fractions (membranes and yeast-content supernatant before and after filtration to eliminate the membrane) or yeast culture medium before and after fermentation was investigated.N-Acetylgalactosamine (GalNAC) was employed as the reference inhibitory sugar. The percentage of amoebae bearing red cells after pretreatment of amoebae with the various suspensions and derivates was determined. Adhesion was also evaluated by scanning electron microscopy (SEM). Pretreatment of amoebae with the live yeast suspension led to a significant reduction in the percentage of adhesion [32% vs 70% in the phosphate-buffered saline (PBS) control]. Reduced adhesion was also observed with the filtered and unfiltered supernatant of the yeast suspension homogenate [32% and 34%, respectively, vs 69% in the PBS control], yeast culture medium at the end of fermentation [49% vs 76% in the PBS control] and GalNAC [32% vs 72% in the PBS control]. SEM showed a decrease in the number of amoebae bearing red cells and a reduction in the number of red cells adhering to amoebae. We conclude that substances produced by the yeasts compete with red cells for adhesion sites on amoebae.

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Correspondence to M. C. Rigothier.

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Rigothier, M.C., Maccario, J. & Gayral, P. Inhibitory activity of saccharomyces yeasts on the adhesion ofEntamoeba histolytica trophozoites to human erythrocytes in vitro. Parasitol Res 80, 10–15 (1994). https://doi.org/10.1007/BF00932617

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Keywords

  • Sugar
  • Scanning Electron Microscopy
  • Inhibitory Activity
  • Target Cell
  • Human Erythrocyte