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Fontoura IC, Trombone APF, Almeida LP, Lorenzi JCC, Rossetti RAM, Malardo T, Padilha E, Schluchting W, Silva RLL, Gembre AF, Fiuza JEC, Silva CL, Panunto-Castelo A, Coelho-Castelo AAM. B cells expressing IL-10 mRNA modulate memory T cells after DNA-Hsp65 immunization. ACTA ACUST UNITED AC 2015; 48:1095-100. [PMID: 26397973 PMCID: PMC4661025 DOI: 10.1590/1414-431x20154409] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Accepted: 06/30/2015] [Indexed: 11/26/2022]
Abstract
In DNA vaccines, the gene of interest is cloned into a bacterial plasmid that is
engineered to induce protein production for long periods in eukaryotic cells.
Previous research has shown that the intramuscular immunization of BALB/c mice with a
naked plasmid DNA fragment encoding the Mycobacterium leprae 65-kDa
heat-shock protein (pcDNA3-Hsp65) induces protection against M.
tuberculosis challenge. A key stage in the protective immune response
after immunization is the generation of memory T cells. Previously, we have shown
that B cells capture plasmid DNA-Hsp65 and thereby modulate the formation of
CD8+ memory T cells after M. tuberculosis challenge in
mice. Therefore, clarifying how B cells act as part of the protective immune response
after DNA immunization is important for the development of more-effective vaccines.
The aim of this study was to investigate the mechanisms by which B cells modulate
memory T cells after DNA-Hsp65 immunization. C57BL/6 and BKO mice were injected three
times, at 15-day intervals, with 100 µg naked pcDNA-Hsp65 per mouse. Thirty days
after immunization, the percentages of effector memory T (TEM) cells (CD4+
and CD8+/CD44high/CD62Llow) and memory
CD8+ T cells
(CD8+/CD44high/CD62Llow/CD127+) were
measured with flow cytometry. Interferon γ, interleukin 12 (IL-12), and IL-10 mRNAs
were also quantified in whole spleen cells and purified B cells (CD43−)
with real-time qPCR. Our data suggest that a B-cell subpopulation expressing IL-10
downregulated proinflammatory cytokine expression in the spleen, increasing the
survival of CD4+ TEM cells and CD8+ TEM/CD127+
cells.
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Affiliation(s)
- I C Fontoura
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | | | - L P Almeida
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - J C C Lorenzi
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - R A M Rossetti
- Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brasil
| | - T Malardo
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - E Padilha
- Universidade Paranaense, Cascavel, PR, Brasil
| | - W Schluchting
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - R L L Silva
- Departamento de Educação em Saúde, Universidade Federal de Sergipe, Lagarto, SE, Brasil
| | - A F Gembre
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - J E C Fiuza
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - C L Silva
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - A Panunto-Castelo
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - A A M Coelho-Castelo
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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Rocha CD, Trombone APF, Lorenzi JCC, Almeida LP, Gembre AF, Padilha E, Ramos SG, Silva CL, Coelho-Castelo AAM. Antigen-presenting cells transfected with Hsp65 messenger RNA fail to treat experimental tuberculosis. Braz J Med Biol Res 2012; 45:1183-94. [PMID: 22983180 PMCID: PMC3854234 DOI: 10.1590/s0100-879x2012007500148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Accepted: 08/15/2012] [Indexed: 11/22/2022] Open
Abstract
In the last several years, the use of dendritic cells has been studied as a therapeutic strategy against tumors. Dendritic cells can be pulsed with peptides or full-length protein, or they can be transfected with DNA or RNA. However, comparative studies suggest that transfecting dendritic cells with messenger RNA (mRNA) is superior to other antigen-loading techniques in generating immunocompetent dendritic cells. In the present study, we evaluated a new therapeutic strategy to fight tuberculosis using dendritic cells and macrophages transfected with Hsp65 mRNA. First, we demonstrated that antigen-presenting cells transfected with Hsp65 mRNA exhibit a higher level of expression of co-stimulatory molecules, suggesting that Hsp65 mRNA has immunostimulatory properties. We also demonstrated that spleen cells obtained from animals immunized with mock and Hsp65 mRNA-transfected dendritic cells were able to generate a mixed Th1/Th2 response with production not only of IFN-γ but also of IL-5 and IL-10. In contrast, cells recovered from mice immunized with Hsp65 mRNA-transfected macrophages were able to produce only IL-5. When mice were infected with Mycobacterium tuberculosis and treated with antigen-presenting cells transfected with Hsp65 mRNA (therapeutic immunization), we did not detect any decrease in the lung bacterial load or any preservation of the lung parenchyma, indicating the inability of transfected cells to confer curative effects against tuberculosis. In spite of the lack of therapeutic efficacy, this study reports for the first time the use of antigen-presenting cells transfected with mRNA in experimental tuberculosis.
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Affiliation(s)
- C D Rocha
- Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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