A Carbohydrate Moiety of Secreted Stage-Specific Glycoprotein 4 Participates in Host Cell Invasion by Trypanosoma cruzi Extracellular Amastigotes

A Carbohydrate Moiety of Secreted Stage-Specific Glycoprotein 4 Participates in Host Cell Invasion by Trypanosoma cruzi Extracellular Amastigotes

Author Florentino, Pilar T. V. Google Scholar
Real, Fernando Google Scholar
Orikaza, Cristina Mary Autor UNIFESP Google Scholar
Cunha, Julia P. C. da Google Scholar
Vitorino, Francisca N. L. Google Scholar
Cordero, Esteban M. Google Scholar
Sobreira, Tiago J. P. Google Scholar
Mortara, Renato Arruda Autor UNIFESP Google Scholar
Abstract Trypanosoma cruzi is the etiologic agent of Chagas' disease. It is known that amastigotes derived from trypomastigotes in the extracellular milieu are infective in vitro and in vivo. Extracellular amastigotes (EAs) have a stage-specific surface antigen called Ssp-4, a GPI-anchored glycoprotein that is secreted by the parasites. By immunoprecipitation with the Ssp-4-specific monoclonal antibodies (mAb) 2C2 and 1D9, we isolated the glycoprotein from EAs. By mass spectrometry, we identified the core protein of Ssp-4 and evaluated mRNA expression and the presence of Ssp-4 carbohydrate epitopes recognized by mAb1D9. We demonstrated that the carbohydrate epitope recognized by mAb1D9 could promote host cell invasion by EAs. Although infectious EAs express lower amounts of Ssp-4 compared with less-infectious EAs (at the mRNA and protein levels), it is the glycosylation of Ssp-4 (identified by mAb1D9 staining only in infectious strains and recognized by galectin-3 on host cells) that is the determinant of EA invasion of host cells. Furthermore, Ssp-4 is secreted by EAs, either free or associated with parasite vesicles, and can participate in host-cell interactions. The results presented here describe the possible role of a carbohydrate moiety of T. cruzi surface glycoproteins in host cell invasion by EA forms, highlighting the potential of these moieties as therapeutic and vaccine targets for the treatment of Chagas' disease.
Keywords Trypanosoma cruzi
extracellular amastigotes
Ssp-4 glycoprotein
xmlui.dri2xhtml.METS-1.0.item-coverage Lausanne
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
Grant number FAPESP: 2011/51475-3
FAPESP: 2012/23150-5
CNPq: 302068/2016-3
Date 2018
Published in Frontiers In Microbiology. Lausanne, v. 9, p. -, 2018.
ISSN 1664-302X (Sherpa/Romeo, impact factor)
Publisher Frontiers Media Sa
Extent -
Origin http://dx.doi.org/10.3389/fmicb.2018.00693
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000429562900001
URI https://repositorio.unifesp.br/handle/11600/55639

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