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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2008.tde-17092008-113606
Document
Author
Full name
Jean Pierre Schatzmann Peron
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Rizzo, Luiz Vicente (President)
Câmara, Niels Olsen Saraiva
Camargo, Maristela Martins de
Keller, Alexandre de Castro
Santos, Leonilda Maria Barbosa dos
Title in Portuguese
O fenômeno da tolerância oral e a regulação de células patogênicas Th17 no modelo de encefalomielite experimental auto-imune.
Keywords in Portuguese
EAE
IL-6
Supressão
Th17
Tolerância oral
Abstract in Portuguese
Recentemente demonstrou-se o papel de células T produtoras de IL-17 na patogênese da esclerosa múltipla e de seu modelo, a EAE. Através da produção desta e de outras citocinas, a população chamada Th17 promove o rompimento da barreira hematoencefálica e a conseqüente infiltração de células patogênicas para dentro do SNC. Nesse contexto, em nosso trabalho utilizamos o fenômeno da tolerância oral para avaliar a capacidade deste em suprimir a resposta imune durante o modelo de EAE, mais especificamente as células Th17. Nossos dados demonstram uma diminuição de IL-17 tanto na periferia como no SNC dos animais tolerados. Além disso, detectamos menos CCL2 e IL-6 em células extraídas do CNS dia 10 pós-imunização. Não observarmos diferença na produção de IL-4,5,10, 13, IL-12p70, TNF-a, e IFN-g entre os grupos. Em suma, nossos resultados mostram que o fenômeno da tolerância oral é capaz de suprimir parâmetros de EAE devido a uma menor capacidade linfoproliferativa associada a uma supressão de células patogênicas Th17 tanto na periferia como no SNC.
Title in English
The oral tolerance phenomenon and the regulation of pathogenic Th17 cells during the EAE model.
Keywords in English
EAE
IL-6
Oral tolerance
Supression
Th17
Abstract in English
It has recently been shown the role of IL-17 secreting cells on the pathogenesis of multiple sclerosis and also in its model, EAE. Due to the secretion of this and other cytokines, the population so called Th17, promotes the disruption of the blood-brain barrier and the following infiltration of pathogenic cells into the CNS. In this context, in our work we used the oral tolerance phenomenon to evaluate its supressive capacity, more specifically over the Th17 cells. We showed that oral tolerated mice has a diminished production of IL-17 both in the periphery and in the CNS. Futhermore, we detected lower levels of CCL2 and IL-6 also from brain and spinal cord extracted mononucear cells at day 10th post-immunization. We were not able to detect differences on IL-4,5,10, 13, IL-12p70, TNF-a, e IFN-g between the groups. Thus, our results show that the oral tolerance phenomenon suppresses EAE findings, mainly due to a lower lymphoprolipherative response associated to a supression over the expansion of Th17 pathogenic T cells both in the periphery and inside the CNS.
 
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Publishing Date
2008-09-22
 
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