Surface Localization, Regulation, and Biologic Properties of the 96-kDa Alcohol/Aldehyde Dehydrogenase (EhADH2) of Pathogenic Entamoeba histolytica

Abstract
The 96-kDa surface antigen of Entamoeba histolytica was demonstrated through extensiveimmunologic evaluation with monoclonal and monospecific antibodies to be identical to or an isoform of the amebic alcohol/aldehyde dehydrogenase (EhADH2). EhADH2 was secreted, excreted, or shed into the culture medium in quantities commensurate with amebic growth when studied in a novel culture system. Of importance, using RNase protection assays, specific mRNA coding for the EhADH2 gene product(s) was up-regulated by treatment of viable trophozoites with the enzyme substrate ethanol. These data provide insight into the biology of this enzyme and its regulation by appropriate stressors.

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