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Antigen localization and the induction of resistance in mice vaccinated with irradiated cercariae of Schistosoma mansoni

Published online by Cambridge University Press:  06 April 2009

A. P. Mountford ,
P. S. Coulson  and
R. A. Wilson
A. P. Mountford
Affiliation:
Department of Biology, University of York, York YOl 5DD
P. S. Coulson
Affiliation:
Department of Biology, University of York, York YOl 5DD
R. A. Wilson
Affiliation:
Department of Biology, University of York, York YOl 5DD
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Summary

The fate of 75Se-labelled parasites and their released pre-synthesized macromolecules has been followed in three murine infection models. Parasite numbers in specific tissues were determined by autoradiography, and released material was estimated by gamma-counting of tissues, with adjustment for the presence of parasite-associated radiolabel. Marked differences were found between the three models. The pattern of migration of normal schistosomula was similar to that previously reported. In addition we have described the transit of parasites through the lymph nodes draining the infection site. Significant quantities of released material were detected in the skin, draining lymph nodes, bloodstream and liver. The circulating material was of parasite origin, macromolecular, and hence potentially antigenic. In comparison to the normal infection, radiation-attenuated parasites (inducing a high level of resistance to challenge) persisted in the skin, draining lymph nodes and lungs, releasing a proportionally greater amount of material in the nodes. In mice exposed to attenuated parasites and treated with the compound ROl1–3128 at 24 h (inducing a low level of resistance) there was an early death and rapid clearance of the parasites whilst still in the skin. This situation resulted in the highest levels of released material in the skin, bloodstream and liver, but negligible levels in the draining lymph nodes. We suggest that the persistence of radiation-attenuated parasites in the skin and draining lymph nodes, together with the prolonged release of antigen in the latter site, compared to the normal situation, are major factors in the induction of resistance.

Type
Research Article
Information
Parasitology , Volume 97 , Issue 1 , August 1988 , pp. 11 - 25
Copyright
Copyright © Cambridge University Press 1988

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References

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