Journal Article

<i>Entamoeba histolytica</i> alcohol dehydrogenase 2 (EhADH2) as a target for anti-amoebic agents

Avelina Espinosa, David Clark and Samuel L. Stanley

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 54, issue 1, pages 56-59
Published in print July 2004 | ISSN: 0305-7453
Published online July 2004 | e-ISSN: 1460-2091 | DOI:
Entamoeba histolytica alcohol dehydrogenase 2 (EhADH2) as a target for anti-amoebic agents

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Objectives: The current use of metronidazole as an anti-amoebic agent causes significant side-effects. The purpose of this study was to identify alternative compounds with which to treat amoebiasis.

Methods: We tested the effects of cyclopropyl (CPC) and cyclobutyl (CBC) carbinols on the survival of Entamoeba histolytica trophozoites and on the enzymatic activities of E. histolytica alcohol dehydrogenase 2 (EhADH2), a crucial enzyme in the amoebic fermentation pathway.

Results: At 72 h, the estimated 50% inhibitory concentrations of CPC and CBC were 38.9 and 11.2 μM, respectively. The EhADH2 alcohol and aldehyde dehydrogenase activities were inhibited by 1.82 μM CPC and 0.89 μM CBC in vitro.

Conclusions: CPC and CBC are expected to be non-toxic to humans at the concentrations required to eliminate E. histolytica trophozoites. Similarities between EhADH2 and the Giardia lamblia AdhE enzyme indicate that CPC and CBC could be effective drugs for treatment of both amoebiasis and giardiasis.

Keywords: bifunctional proteins; glycolytic pathways; eukaryotic parasites; cycloalkanols; alcohol dehydrogenase E

Journal Article.  2383 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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