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Schistosoma mansoni: complement activation in human and rodent sera by living parasites of various developmental stages

Published online by Cambridge University Press:  06 April 2009

A. Ruppel
Affiliation:
Institut für Immunologie und Serlogie der Universität Heidelberg, Im Neuenheimer Feld 305, D-6900 Heidelberg, F.R.G.
U. Rother
Affiliation:
Institut für Immunologie und Serlogie der Universität Heidelberg, Im Neuenheimer Feld 305, D-6900 Heidelberg, F.R.G.
H. Vongerichten
Affiliation:
Institut für Immunologie und Serlogie der Universität Heidelberg, Im Neuenheimer Feld 305, D-6900 Heidelberg, F.R.G.
H. J. Diesfeld
Affiliation:
Institut für Tropenhygiene der Universität Heidelberg, Im Neuenheimer Feld 324, D-6900 Heidelberg, F.R.G.

Summary

Living Schistosoma mansoni of various developmental stages were studied with respect to their ability to activate the complement system in sera of humans, mice and rats. Immunofluorescence assays demonstrated that binding of human C3 occurred on fresh schistosomula as well as on schistosomula prepared from mouse lymph-nodes or lungs and on adult schistosomes. However, rodent C3 was deposited only on fresh schistosomula. Deposition of human C3 on the worms' surface required activation of the complement system. The alternative pathway was shown to be involved in deposition of human C3 on schistosomes of all ages, whereas activation of the classical pathway was demonstrable only with fresh schistosomula. Immunoelectrophoretic studies demonstrated a dose-dependent cleavage of human C3 and conversion of factor B by living adult schistosomes. The results demonstrate that the ability of living schistosomes to activate complement in vitro is dependent not only on their developmental stage but also on the species of the serum.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1983

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