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Evasion of macrophage microbicidal mechanisms by mature sporozoites of Plasmodium yoelii yoelii

Published online by Cambridge University Press:  06 April 2009

Judith E. Smith
Affiliation:
Department of Pure and Applied Biology, Imperial College of Science and Technology, Prince Consort Road, London SW7 2BB
James Alexander
Affiliation:
Department of Pure and Applied Biology, Imperial College of Science and Technology, Prince Consort Road, London SW7 2BB

Summary

Sporozoites of Plasmodium yoelii yoelii were incubated for 40 min with BALB/c peritoneal macrophages in the presence of nitro-blue tetrazolium (NBT). While immature oocyst sporozoites triggered the macrophage respiratory burst, as visualized microscopically by the localized reduction of NBT to insoluble formazan, 97·6% of mature salivary gland sporozoites did not induce such a response. The macrophage oxidative response was also induced by 82·7% of heat-inactivated and 95·7% of trypsin-treated salivary gland sporozoites. The relationship of these results to the infectivity and immunogenicity of malarial sporozoites is discussed.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1986

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