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Taenia crassiceps surface immunoglobulins: parasite- or host-derived?

Published online by Cambridge University Press:  06 April 2009

D. P. McManus  and
S. Lamsam
D. P. McManus
Affiliation:
Tropical Health Program, Queensland Institute of Medical Research, Bramston Terrace, Brisbane, Queensland 4006, Australia Department of Pure and Applied Biology, Imperial College of Science, Technology and Medicine, London SW7 2BB, U.K.
S. Lamsam
Affiliation:
Department of Pure and Applied Biology, Imperial College of Science, Technology and Medicine, London SW7 2BB, U.K.
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Summary

In common with other taeniid cestodes, host or host-like proteins, especially immunoglobulins, occur on the surface and in the cyst fluid of Taenia crassiceps metacestodes. Here, several approaches have been used to determine the origin of the immunoglobulins present on the tegument. Indirect IFAT showed that IgG was almost totally lost from the surface of bladders after 6 days culture in vitro. There was a rapid reacquisition of immunoglobulins following incubation of the cultured metacestodes with either normal mouse serum or mouse anti-T. crassiceps antiserum. Immunoprecipitation of in vitro translation products and biosynthetically labelled T. crassiceps proteins with a panel of anti-IgG antisera failed to positively identify any molecule with homology to mammalian immunoglobulins. These results suggest strongly that the immunoglobulins located on the surface of T. crassiceps are of host rather than parasite origin. The occurrence of a relatively low abundance receptor in the surface of the bladders, which binds non-specific host immunoglobulin, together with surface-bound specific anti-T. crassiceps antibodies can account for the presence of these host proteins. Freshly obtained bladders and metacestodes cultured in vitro for 6 days were transplanted into naive mice and the survival and development of the resulting parasites compared. In some individual mice there was a decrease in the number and volume of metacestodes and an increase in encapsulated parasites arising from cultured bladders. This was probably not related to the loss of host immunoglobulins from the parasite surface during culture as the reacquisition of these proteins after transplantation is likely to be far more rapid than any immune response could evoke in a naive host.

Keywords

Taenia crassicepsmolecular mimicryIgG‘blocking’ antibodiesin vitro translationbiosynthetic labellingtransplantation
Type
Research Article
Information
Parasitology , Volume 101 , Issue 1 , August 1990 , pp. 127 - 137
Copyright
Copyright © Cambridge University Press 1990

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