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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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