Fasciola hepatica Cysteine Proteinases: Immunodominant Antigens in Human Fascioliasis

Martha Cordova Biochemistry Laboratory, and Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Instituto de Medicina Tropical Daniel Alcides Carrion, Universidad Nacional Mayor de San Marcos, Laboratory for Genome Analysis, Department of Pathology, University of Cambridge, Lima, Peru

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Patricia Herrera Biochemistry Laboratory, and Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Instituto de Medicina Tropical Daniel Alcides Carrion, Universidad Nacional Mayor de San Marcos, Laboratory for Genome Analysis, Department of Pathology, University of Cambridge, Lima, Peru

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Luis Nopo Biochemistry Laboratory, and Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Instituto de Medicina Tropical Daniel Alcides Carrion, Universidad Nacional Mayor de San Marcos, Laboratory for Genome Analysis, Department of Pathology, University of Cambridge, Lima, Peru

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Jaime Bellatin Biochemistry Laboratory, and Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Instituto de Medicina Tropical Daniel Alcides Carrion, Universidad Nacional Mayor de San Marcos, Laboratory for Genome Analysis, Department of Pathology, University of Cambridge, Lima, Peru

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Cesar Naquira Biochemistry Laboratory, and Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Instituto de Medicina Tropical Daniel Alcides Carrion, Universidad Nacional Mayor de San Marcos, Laboratory for Genome Analysis, Department of Pathology, University of Cambridge, Lima, Peru

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Humberto Guerra Biochemistry Laboratory, and Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Instituto de Medicina Tropical Daniel Alcides Carrion, Universidad Nacional Mayor de San Marcos, Laboratory for Genome Analysis, Department of Pathology, University of Cambridge, Lima, Peru

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Jose R. Espinoza Biochemistry Laboratory, and Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Instituto de Medicina Tropical Daniel Alcides Carrion, Universidad Nacional Mayor de San Marcos, Laboratory for Genome Analysis, Department of Pathology, University of Cambridge, Lima, Peru

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DOI:
https://doi.org/10.4269/ajtmh.1997.57.660
Volume/Issue:
Volume 57: Issue 6
Page(s):
660–666
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Fasciola hepatica adult worm cysteine proteinases were active-site, affinity radio-labeled with benzyloxicarbonyl-L-tyrosine-L-alanine diazomethylketone (Z-Tyr125I-Ala-CHN2). Sera from patients with fascioliasis and from rabbits experimentally infected with F. hepatica immunoprecipitated the radiolabeled parasite cysteine proteinases in immunoelectrophoresis assays. Two purified antigens were identified as part of the complex mosaic of antigens immunoprecipitated by the sera of infected patients. These antigens (Fas1 and Fas2) have been shown to be an important part of the Fharc2 precipitin band used for serologic diagnosis in humans and cattle. They showed cysteine proteinase activity with different proteolytic specificities and partial identity in double immunodiffusion assays. The results obtained in this work show that the Fas1 and Fas2 antigens are sensitive and specific antigens for diagnosis of this serious helminthic disease in humans and other susceptible hosts.

Author Notes

Copyright:
Copyright © 1997 by The American Society of Tropical Medicine and Hygiene 1997
Published Online:
Dec 1997
Cover The American Journal of Tropical Medicine and Hygiene
The American Journal of Tropical Medicine and Hygiene
Print ISSN:
0002-9637
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