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Immunity to Schistosoma mansoni in congenitally athymic, irradiated and mast cell-depleted rats

Published online by Cambridge University Press:  06 April 2009

M. J. Ford
Affiliation:
Department of Medical Helminthology, Winches Farm Field Station, London School of Hygiene and Tropical Medicine, 395 Hatfield Road, St Albans, Herts. AL4 0XQ
Q. D. Bickle
Affiliation:
Department of Medical Helminthology, Winches Farm Field Station, London School of Hygiene and Tropical Medicine, 395 Hatfield Road, St Albans, Herts. AL4 0XQ
M. G. Taylor
Affiliation:
Department of Medical Helminthology, Winches Farm Field Station, London School of Hygiene and Tropical Medicine, 395 Hatfield Road, St Albans, Herts. AL4 0XQ

Summary

Immunity to Schistosoma mansoni was investigated in congenitally athymic (Nu/Nu) rats, irradiated rats and in mast cell-depleted rats. Nu/Nu rats failed to develop significant resistance following vaccination with irradiated cercariae, although Nu/Nu recipients of serum from vaccinated Fischer rats (VRS) manifested resistance comparable to heterozygous controls, suggesting that T-cells were required in the induction of resistance but were not involved in the efferent arm of antibody-dependent elimination. Radiosensitive cells (including eosinophils, basophils, neutrophils, lymphocytes and mast cells) were apparently not essential for the antibody-dependent elimination of lung or post-lung stages since irradiated (700–750 rad.) recipients of VRS manifested comparable degrees of resistance to unirradiated controls in spite of a greater than 85% reduction in total blood leucocyte counts after irradiation. Depletion of 99 % of tissue mast cells by treatment of rats with Compound 48/80 had no significant effect on the attrition of a challenge infection in rats rendered immune by vaccination with irradiated cercariae or by transfer of VRS. However, there was a significant increase in worm recovery in unimmunized and mast cell-depleted or irradiated rats, indicating that mast cells and perhaps other radio-isotope sensitive cells may be involved in innate resistance.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1987

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