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Infection and Immunity, July 2007, p. 3264-3270, Vol. 75, No. 7
0019-9567/07/$08.00+0     doi:10.1128/IAI.00262-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Expression and Cellular Localization of Molecules of the gp82 Family in Trypanosoma cruzi Metacyclic Trypomastigotes{triangledown}

Vanessa D. Atayde, Mauro Cortez, Renata Souza, José Franco da Silveira, and Nobuko Yoshida*

Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Rua Botucatu 862-6° andar, 04023-062, São Paulo, Brazil

Received 16 February 2007/ Returned for modification 22 March 2007/ Accepted 6 April 2007

A member of the Trypanosoma cruzi gp82 family, expressed on metacyclic trypomastigote surface and identified by monoclonal antibody (MAb) 3F6, plays a key role in host cell invasion. Apart from the gp82 defined by MAb 3F6, no information is available on members of this protein family. From cDNA clones encoding gp82 proteins sharing 59.1% sequence identity, we produced the recombinant proteins J18 and C03, the former containing and the latter lacking the epitope for MAb 3F6. Polyclonal antibodies to J18 and C03 proteins were generated and used, along with MAb 3F6, to analyze the expression and cellular localization of gp82 family members in metacyclic forms of CL and G strains, which belong to highly divergent genetic groups. By two-dimensional gel electrophoresis and immunoblotting, molecules of 82 to 86 kDa, focusing at pH 4.6 to 5.4, and molecules of 72 to 88 kDa, focusing at pH 4.9 to 5.7, were visualized in CL and G strains, respectively. Flow cytometry and microscopic analysis revealed in both strains similar expression of MAb 3F6-reactive gp82 in live and permeabilized parasites, indicating its surface localization. The reaction of live parasites of both strains with anti-J18 antibodies was weaker than with MAb 3F6 and was increased by permeabilization. Anti-C03 antibodies bound predominantly to flagellar components in permeabilized G strain parasites, but in the CL strain the flagellum was not the preferential target for these antibodies. Host cell invasion of metacyclic forms was inhibited by J18 protein, as well as by MAb 3F6 and anti-J18 antibodies, but not by C03 protein or anti-C03 antibodies.

* Corresponding author. Mailing address: Escola Paulista de Medicina, Universidade Federal de São Paulo, Rua Botucatu 862-6° andar, 04023-062 São Paulo, S.P., Brazil. Phone: 55 11 5576 4532. Fax: 55 11 5571 1095. E-mail: nyoshida{at}ecb.epm.br

{triangledown} Published ahead of print on 16 April 2007.

Editor: W. A. Petri, Jr.

Infection and Immunity, July 2007, p. 3264-3270, Vol. 75, No. 7
0019-9567/07/$08.00+0     doi:10.1128/IAI.00262-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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