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ATP diphosphohydrolase from Schistosoma mansoni egg: characterization and immunocytochemical localization of a new antigen

Published online by Cambridge University Press:  10 June 2004

P. FARIA-PINTO ,
M. N. L. MEIRELLES ,
H. L. LENZI ,
E. M. MOTA ,
M. L. O. PENIDO ,
P. M. Z. COELHO  and
E. G. VASCONCELOS
P. FARIA-PINTO
Affiliation:
Departamento de Bioquímica/ICB, Universidade Federal de Juiz de Fora, 36015-400 Juiz de Fora, MG, Brasil Departamento de Ultraestrutura e Biologia Celular, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, RJ, Brasil
M. N. L. MEIRELLES
Affiliation:
Departamento de Ultraestrutura e Biologia Celular, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, RJ, Brasil
H. L. LENZI
Affiliation:
Departamento de Patologia, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, RJ, Brasil
E. M. MOTA
Affiliation:
Departamento de Patologia, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, RJ, Brasil
M. L. O. PENIDO
Affiliation:
Departamento de Bioquímica/ICB, Universidade Federal de Juiz de Fora, 36015-400 Juiz de Fora, MG, Brasil
P. M. Z. COELHO
Affiliation:
Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, FIOCRUZ, and Sta Casa de Misericórdia de Belo Horizonte, Belo Horizonte, MG, Brasil
E. G. VASCONCELOS
Affiliation:
Departamento de Bioquímica/ICB, Universidade Federal de Juiz de Fora, 36015-400 Juiz de Fora, MG, Brasil
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Abstract

The fact that the Schistosoma mansoni egg has two ATP diphosphohydrolase (EC 3.6.1.5) isoforms with different net charges and an identical molecular weight of 63000, identified by non-denaturing polyacrylamide gel electrophoresis and immunological cross-reactivity with potato apyrase antibodies, is shown. In soluble egg antigen (SEA), only the isoform with the lower net negative charge was detected and seemed to be the predominant species in this preparation. By confocal fluorescence microscopy, using anti-potato apyrase antibodies, the S. mansoni egg ATP diphosphohydrolase was detected on the external surface of miracidium and in von Lichtenberg's envelope. Intense fluorescence was also seen in the outer side of the egg-shell, entrapped by the surface microspines, suggesting that a soluble isoform is secreted. ATP diphosphohydrolase antigenicity was tested using the vegetable protein as antigen. The purified potato apyrase was recognized in Western blots by antibodies present in sera from experimentally S. mansoni-infected mice. In addition, high levels of IgG anti-ATP diphosphohydrolase antibodies were detected by ELISA in the same sera. This work represents the first demonstration of antigenic properties of S. mansoni ATP diphosphohydrolase and immunological cross-reactivity between potato apyrase and sera from infected individuals.

Keywords

ATP diphosphohydrolasepotato apyraseSchistosoma mansoni eggimmunological cross-reactivityantigenicityimmunolocalizationimmunocytochemistry
Type
Research Article
Information
Parasitology , Volume 129 , Issue 1 , July 2004 , pp. 51 - 57
Copyright
© 2004 Cambridge University Press

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