Antibody-mediated adherence of rat eosinophils to schistosomula of Schistoma mansoni in vitro

Eosinophils from the peritoneal washings of normal rats adhered to live or formalin-fixed schistosomula of Schistosoma mansoni in vitro, in the presence of heat-inactivated serum from infected rats. Eosinophil adherence caused permeability changes in the schistosomula as revealed by 51Cr release and...

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Bibliographic Details
Published in:Clinical and experimental immunology 1977-10, Vol.30 (1), p.97-104
Main Authors: Mackenzie, C D, Ramalho-Pinto, F J, McLaren, D J, Smithers, S R
Format: Article
Language:English
Subjects:
Animals
Cell Membrane - immunology
Eosinophils - immunology
Female
Immunoglobulin G
Leukocyte Count
Peritoneum - immunology
Rats
Schistosoma mansoni - immunology
Schistosomiasis - immunology
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Summary:Eosinophils from the peritoneal washings of normal rats adhered to live or formalin-fixed schistosomula of Schistosoma mansoni in vitro, in the presence of heat-inactivated serum from infected rats. Eosinophil adherence caused permeability changes in the schistosomula as revealed by 51Cr release and methylene blue uptake. The serum factor which mediated adherence resided in the 7S fraction after Sephadex G-200 gel filtration. Protein A from Staphylococcus aureus which binds specifically to the Fc piece of IgG inhibited adherence, thereby demonstrating that IgG was the antibody responsible for this reaction and that the Fc portion was the site of interaction between eosinophil and antibody; rat eosinophils were shown to possess Fc receptors. The antibody mediating adherence reached high titres in the sera of rats 5-8 weeks after exposure to 500 cercariae, but thereafter there was a gradual decline in titre. Surface membrane from adult S. mansoni inhibited adherence, indicating the presence of cross-reacting antigens in adult worms and schistosomula.
ISSN:0009-9104
1365-2249