Entamoeba histolytica: cytopathogenicity and lectin activity of avirulent mutants |
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| Authors: | E Orozco M A Rodriquez C F Murphy R A Salata W A Petri R D Smith J I Ravdin |
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| Institution: | 1. Department of Pediatric Pulmonology, Wilhelmina Children''s Hospital - University Medical Centre, Utrecht University, Utrecht, Netherlands;2. Department of Pulmonology & Cystic Fibrosis, Haga Teaching Hospital, The Hague, Netherlands;3. Regenerative Medicine Center, University Medical Centre, Utrecht University, Utrecht, Netherlands;4. Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands;5. Foundation Hubrecht Organoid Technology (HUB), Utrecht, Netherlands;6. Hubrecht Institute for Developmental Biology and Stem Cell Research/ University Medical Centre, Utrecht University, Utrecht, Netherlands;7. Department of Gastroenterology & Hepatology, University Medical Centre, Utrecht University, Utrecht, Netherlands;8. Julius Center for Health Sciences and Primary Care, University Medical Center, Utrecht University, Utrecht, Netherlands;9. Department of Pulmonology, University Medical Centre, Utrecht University, Utrecht, Netherlands |
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| Abstract: | Three clones of Entamoeba histolytica (L-6, C93, C919) were isolated by mutagenesis with ethyl methanesulfonate from the axenic strain HM1:IMSS and were studied for adherence, cytolytic, and soluble galactose inhibitable lectin activity. Avirulent clones adhered to and killed fewer Chinese hamster ovary cells than HM1:IMSS (P less than 0.01). However, only C919 was deficient in adherence to red blood cells. Galactose (1.0 g) completely inhibited adherence of all the mutants to Chinese hamster ovary cells; however, adherence to erythrocytes was only partially inhibitable by galactose. Avirulent mutants were more susceptible to being killed by human neutrophils in vitro (P less than 0.01 compared to HM1:IMSS). Soluble protein preparations from all the avirulent mutants were markedly less mitogenic for human lymphocytes and had lower lectin activity for Chinese hamster ovary cells compared to the HM1:IMSS wild type (P less than 0.01 for each activity with each mutant). Indirect immunofluorescence with a monoclonal antibody (F-14) that recognizes the Gal/GalNAc lectin was positive for L-6 and C919. These findings utilizing avirulent mutants of E. histolytica further support a role for the amebic galactose inhibitable lectin in the in vivo pathogenesis of amebiasis. |
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