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The presence of secretory immunoglobulin A (IgA) anti-Entamoeba histolytica antibodies in the saliva of patients with intestinal amebiasis was demonstrated by immunoblot assay, and the capacity of these antibodies to inhibit amebic adherence to a monolayer of MDCK cells was analyzed. Inhibition was due to IgA antiamebic antibodies and in part to anti-Gal-binding-lectin antibodies, as demonstrated by absorption experiments with total amebic extract and with the fraction of Gal-binding lectin. These results emphasize the relevance of secretory IgA antibodies in the phenomenon of E. histolytica adherence to epithelial cells.
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