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The magnitude and kinetics of delayed-type hypersensitivity responses in mice vaccinated with irradiated cercariae of Schistosoma mansoni

Published online by Cambridge University Press:  06 April 2009

E. C. Ratcliffe  and
R. A. Wilson
E. C. Ratcliffe
Affiliation:
Department of Biology, University of York, York YO1 5DD
R. A. Wilson
Affiliation:
Department of Biology, University of York, York YO1 5DD
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Extract

A footpad assay was used to measure the DTH of mice to soluble worm antigens (SWAP), and to living day 7 lung schistosomula, following vaccination and challenge infections with Schistosoma mansoni. DTH to SWAP was first observed on day 10, and reached its maximum on day 17 post-vaccination. Treatment of mice with anti-CD4 antibody on the 3 days prior to footpad challenge completely abrogated this response. Reactivity to living parasites was of a lower order than that to SWAP; it also peaked earlier, on day 10 post-vaccination. By day 35, responsiveness to both sets of antigens had declined almost to control levels. There was no correlation between the level of DTH to living schistosomula, at any time, and the degree of resistance subsequently developed. Percutaneous challenge of vaccinated mice was followed by a resurgence of reactivity to SWAP. This secondary response occurred more rapidly than the primary response, peaking on day 7 post-challenge, and was of a similar magnitude. We were unable to detect a similar recall of DTH to living schistosomula, possibly because the assay was insufficiently sensitive. We conclude that the intensity and kinetics of DTH responsiveness are crucial features of the irradiated vaccine model, and suggest that further investigation of cell-mediated immune reactions, particularly those occurring in the lungs, is vital to a better understanding of events underlying the development and expression of immunity.

Keywords

Schistosoma mansonivaccinationdelayed-type hypersensitivity
Type
Research Article
Information
Parasitology , Volume 103 , Issue 1 , August 1991 , pp. 65 - 75
Copyright
Copyright © Cambridge University Press 1991

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