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pubmed-article:19712768pubmed:abstractTextChagas' disease, caused by infection with the protozoan parasite Trypanosoma cruzi (T. cruzi), is intractable showing a high mortality rate, and the development of effective vaccines is much desired. To examine the efficacy of a new mode of recombinant viral vaccine, we constructed two non-transmissible Sendai viruses (rSeV/dF) encoding the full-length parasite antigen amastigote surface protein-2 (ASP2) or ASP2 fused with a mono-ubiquitin on its N-terminus (UASP2). C57BL/6 mice immunized intranasally with rSeV/dF expressing either ASP2 or UASP2 showed significantly suppressed parasitemia and could be protected from lethal T. cruzi challenge. Depletion of CD8(+) T cells around the time of infection with T. cruzi completely abolished this protection, confirming that acquired immunity against the infection of T. cruzi is dependent on CD8(+) T cells. We also demonstrated that the protective immunity correlated with higher secretion of interferon-gamma (IFN-gamma) by spleen cells on in vitro-specific or non-specific stimulation. Increased CTL activity was also confirmed by degranulation or CTL assays. Interestingly, the control virus, rSeV/dF-GFP, induced even a higher IFN-gamma production from spleen cells following non-specific but not specific stimulation in vitro, suggesting that SeV may also be a good adjuvant when used as a vaccine vehicle. Taking together, the current findings indicate that recombinant Sendai virus expressing the ASP2 or UASP2 antigens of T. cruzi are interesting candidates for the development of a new mode of recombinant viral vaccine against Chagas' disease.lld:pubmed
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pubmed-article:19712768pubmed:year2009lld:pubmed
pubmed-article:19712768pubmed:articleTitleEfficient protective immunity against Trypanosoma cruzi infection after nasal vaccination with recombinant Sendai virus vector expressing amastigote surface protein-2.lld:pubmed
pubmed-article:19712768pubmed:affiliationDepartment of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.lld:pubmed
pubmed-article:19712768pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19712768pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed