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Doctoral Thesis
DOI
10.11606/T.10.2017.tde-21062017-160938
Document
Author
Full name
Daniel Sanzio Gimenes da Cruz
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Gomes, Cristina de Oliveira Massoco Salles (President)
Longhini, Ana Leda Figueiredo
Pinto, Frederico Azevedo da Costa
Queiroz, Nicolle Gilda Teixeira de
Santos, Patricia Cruz Bergami
Title in Portuguese
Papel dos adrenoceptores β em células dendríticas derivadas de monócitos humanos
Keywords in Portuguese
Células dendríticas (DCs)
Estresse
Neuroimunomodulação
Sistema nervoso simpático (SNS)
Abstract in Portuguese
O sistema nervoso simpático (SNS) inerva a maioria dos órgãos linfoides e durante situações de estresse, por meio da liberação da noradrenalina de seus ramos eferentes, emitem sinais capazes de modular as repostas imunes. Nossa hipótese foi de que esta via poderia alterar a função de células dendríticas (DCs) derivadas de monócitos humanos, uma vez que receptores adrenérgicos já foram demonstrados em DCs murinas e pelo fato de que as estas células são chave na iniciação de respostas imunes adaptativas, bem como indutoras de tolerância. Desta forma, DCs diferenciadas a partir de monócitos sanguíneos provenientes de doadores saudáveis tratadas com ligantes adrenérgicos foram analisadas quanto a expressão de marcadores de membrana, atividade fagocítica, apresentação antigênica em ensaio de reação mista de linfócitos, expressão gênica de marcadores de diferenciação e ativação, bem como produção de citocinas. Os resultados revelaram que as DCs apresentam transcritos apenas para o adrenoceptor β2, e esta expressão é similar à de macrófagos, mas inferior a de linfócitos. A análise dos marcadores fenotípicos de membrana, atividade fagocítica, apresentação antigênica e produção de citocinas não mostraram alterações nas células tratadas com agonistas adrenérgicos. No entanto, o tratamento com ligantes adrenérgicos foi capaz de alterar a expressão dos genes CD40, CD80, CD83, CXCL1, TGFB1, FCGR3A, CCR7 e CCL5 em DCs e macrófagos estimulados com LPS ou TNF-α. Embora os efeitos dos ligantes adrenérgicos não tenham sido fortemente evidenciados nos testes realizados, os resultados sugerem que pequenas alterações podem ser provocadas pela ligação das catecolaminas em DCs, sugerindo que estas possam ser moduladas pelo SNS, modificando as respostas imunes
Title in English
Role of β-adrenoceptors in human monocyte-derived dendritic cells
Keywords in English
Dendritic cells (DCs)
Neuroimmunomodulation
Stress
Sympathetic nervous system (SNS)
Abstract in English
The sympathetic nervous system (SNS) innervates most of the lymphoid organs and during stress situations, by releasing norepinephrine from its efferent branches, emit signals capable of modulating immune responses. Our hypothesis was that this pathway could alter the function of human monocyte-derived dendritic cells (DCs), since adrenergic receptors have already been demonstrated in murine DCs, and by the fact that these cells are key in initiating adaptive immune responses as well as tolerance inducers. Thus, differentiated DCs from blood monocytes from healthy donors treated with adrenergic ligands were analyzed for expression of membrane markers, phagocytic activity, antigenic presentation in a mixed lymphocyte reaction assay, gene expression of differentiation and activation markers and cytokine production. The results revealed that DCs present transcripts only for the β2 adrenoceptor, and this expression is similar to that observed in macrophages, but lower than what it is found in lymphocytes. The analysis of phenotypic membrane markers, phagocytic activity, antigenic presentation and cytokine production did not revealed any changes in the cells treated with adrenergic agonists. However, treatment with the adrenergic ligands was able to alter the expression of CD40, CD80, CD83, CXCL1, TGFB1, FCGR3A, CCR7 and CCL5 genes in DCs and macrophages stimulated with LPS or TNF-α. Although the effects of adrenergic ligands have not been strongly demonstrated in the tests performed, the results suggest that small changes can be caused by the binding of catecholamines in DCs, suggesting that they can be modulated by the SNS, modifying immune responses.
 
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Publishing Date
2017-08-15
 
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