Abstract
E.histolytica did not bind significantly ertthrocytes (E) but formed a high percentage of rosettes with bovine E sensitized by rabbit IgG (EA G) or IgM (EA M) antibody as well as rosettes with human E coated by human anti-CD antibody (EA CD). Although a weak phagocytosis of untreated E was recorded both types of E were more frequently ingested upon incubation at 37°C when coated with corresponding antibodies. Attachment of EA to amoeba membrane was visualised even after incubation at 4°C or when amoeba cells were fixed with formaldehyde. Binding of sensitized erythrocytes to amoeba surface was markedly reduced when: (i) bovine E were coated with Fab fragment of rabbit IgG antibody; (ii) EA were previously treated with protein A of S.aureus ; (iii) amoeba were pretreated with monomeric or polymeric IgG or its Fc fragment. It was concluded that E.histolytica possesses Fc-like receptors on its surface.
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