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Doctoral Thesis
Full name
Edimara da Silva Reis
Knowledge Area
Date of Defense
São Paulo, 2008
Isaac, Lourdes (President)
Bonorino, Cristina
Calich, Vera Lucia Garcia
Donadi, Eduardo Antonio
Lima, Maria Regina D'Imperio
Title in Portuguese
Papel do sistema complemento na diferenciação e maturação das células dendríticas.
Keywords in Portuguese
Células dendríticas
Imunologia inata
Sistema complemento
Abstract in Portuguese
O papel do complemento na modulação da resposta de células dendríticas não é bem entendido. Neste trabalho observamos que estas células produzirem proteínas do complemento e que o componente C3 regula positivamente a expressão de DC-SIGN, HLA-DR, CD1a, CD80 e CD86 e a produção de IL-6 e IL-12 por células dendríticas humanas. Também observamos, em modelo murino, menor expressão de MHC-II em células dendríticas C5aR-/-, a qual está associada com menor expressão do transativador de MHC-II; menor expressão de moléculas coestimuladoras nas células C3aR-/-, C5aR-/- e C5L2-/- e menor produção de IL-12p40, IL-12p70 e IL-6 em resposta a ligantes de TLR2 pelas células C3aR-/- e C5aR-/-. Conseqüentemente, a ausência de sinal pelos C3aR e C5aR, regula negativamente a habilidade destas células na indução da resposta de linfócitos T CD4+, modificando os níveis de proliferação e citocinas produzidas. De maneira conjunta, observamos participação do complemento na diferenciação e maturação de células dendríticas e no desenvolvimento da resposta imune adaptativa.
Title in English
Complement system in dendritic cell differentiation and maturation.
Keywords in English
Dendritic cells
Innate immunology
System Completion
Abstract in English
The role of complement in the modulation of dendritic cells functions remains elusive. Here we show that these cells are able to produce complement proteins and that complement C3 upregulates the expression of DC-SIGN, HLA-DR, CD1a, CD80 and CD86 and the production of IL-6 e IL-12 by human dendritic cells. We also observed, in a mouse model, lower expression of MHC-II in C5aR-/- dendritic cells, which is correlated to lower expression of MHC-II transactivator; lower expression of costimmulatory molecules in C3aR-/-, C5aR-/- and C5L2-/- cells and lower production of IL-12p40, IL-12p70 and IL-6 by C3aR-/- and C5aR-/- cells in response to TLR2 stimulation. In consequence to the absence of C3aR and/or C5aR signaling we observed that these cells have lower ability to induce CD4+ T cells proliferation and production of Th1 cytokines. Together our data show a participation of complement in dendritic cell differentiation and maturation and in the polarization of adaptative immune responses.
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