CD8(+)-T-cell-dependent control of Trypanosoma cruzi infection in a highly susceptible mouse strain after immunization with recombinant proteins based on amastigote surface protein 2

CD8(+)-T-cell-dependent control of Trypanosoma cruzi infection in a highly susceptible mouse strain after immunization with recombinant proteins based on amastigote surface protein 2

Autor Araujo, Adriano FS Autor UNIFESP Google Scholar
Alencar, Bruna CG de Autor UNIFESP Google Scholar
Vasconcelos, Jose Ronnie C Autor UNIFESP Google Scholar
Hiyane, Meire I. Autor UNIFESP Google Scholar
Marinho, Claudio RF Google Scholar
Penido, Marcus LO Google Scholar
Boscardin, Silvia B. Autor UNIFESP Google Scholar
Hoft, Daniel F. Google Scholar
Gazzinelli, Ricardo T. Google Scholar
Rodrigues, Mauricio M. Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de Minas Gerais (UFMG)
St Louis Univ
Resumo We previously described that DNA vaccination with the gene encoding amastigote surface protein 2 (ASP-2) protects approximately 65% of highly susceptible A/Sn mice against the lethal Trypanosoma cruzi infection. Here, we explored the possibility that bacterial recombinant proteins of ASP-2 could be used to improve the efficacy of vaccinations. Initially, we compared the protective efficacy of vaccination regimens using either a plasmid DNA, a recombinant protein, or both sequentially (DNA priming and protein boosting). Survival after the challenge was not statistically different among the three mouse groups and ranged from 53.5 to 75%. the fact that immunization with a recombinant protein alone induced protective immunity revealed the possibility that this strategy could be pursued for vaccination. We investigated this possibility by using six different recombinant proteins representing distinct portions of ASP-2. the vaccination of mice with glutathione S-transferase fusion proteins representing amino acids 261 to 500 or 261 to 380 of ASP-2 in the presence of the adjuvants alum and CpG oligodeoxynucleotide 1826 provided remarkable immunity, consistently protecting 100% of the A/Sn mice. Immunity was completely reversed by the in vivo depletion of CD8(+) T cells, but not CD4(+) T cells, and was associated with the presence of CD8(+) T cells specific for an epitope located between amino acids 320 and 327 of ASP-2. We concluded that a relatively simple formulation consisting of a recombinant protein with a selected portion of ASP-2, alum, and CpG oligodeoxynucleotide 1826 might be used to cross-prime strong CD8(+)-T-cell-dependent protective immunity against T. cruzi infection.
Idioma Inglês
Data de publicação 2005-09-01
Publicado em Infection and Immunity. Washington: Amer Soc Microbiology, v. 73, n. 9, p. 6017-6025, 2005.
ISSN 0019-9567 (Sherpa/Romeo, fator de impacto)
Publicador Amer Soc Microbiology
Extensão 6017-6025
Fonte http://dx.doi.org/10.1128/IAI.73.9.6017-6025.2005
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000231460000079
Endereço permanente http://repositorio.unifesp.br/handle/11600/28434

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