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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2010.tde-13122010-112823
Document
Author
Full name
Ana Paula Silva de Azevedo dos Santos
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Barbuto, Jose Alexandre Marzagao (President)
Bonorino, Cristina
Câmara, Niels Olsen Saraiva
Laginha, Fábio Martins
Rodrigues, Elaine Guadelupe
Title in Portuguese
Efeito do microambiente tumoral sobre as características funcionais e fenotípicas de células dendríticas geradas in vitro a partir de monócitos do sangue periférico de voluntárias saudáveis e de pacientes com câncer de mama.
Keywords in Portuguese
Cancer de mama
Células cultivadas de tumor
Células Dendríticas
Fenótipos
Microambiente tumoral
Monócitos
Neoplasias mamárias
Abstract in Portuguese
No câncer de mama, o metabolismo tumoral, ação dos moduladores de estrógenos são fatores que podem influenciar as células dendríticas (DCs). Neste trabalho avaliou o fenótipo de DCs em amostras tumorais, a diferenciação de DCs a partir de células mononucleares do sangue periférico (PBMCs) das pacientes e comparou com voluntárias saudáveis. Os resultados mostraram que há alteração na capacidade de geração, no fenótipo, na capacidade aloestimuladora, maior produção de interleucina 10 e expressão de HSP27 nas DCs de pacientes, comparadas com as DCs de voluntárias saudáveis que produzem mais Interferon-gama. A via p38MAPK parece ser importante na diferenciação de PBMCs em DCs, entretanto, estímulos estressantes podem ativar esta via e induzir a síntese de HSP27 inibindo este processo. O tratamento com tamoxifeno parece modular a expressão de algumas moléculas de membrana. Desta forma, os resultados sugerem que as DCs diferenciadas de pacientes com câncer de mama apresentam alterações fenotípicas e funcionais causadas pelo microambiente tumoral.
Title in English
Effect of the tumor microenvironment on the function and phenotype of dendritic cells generated in vitro from monocytes obtained from healthy volunteers and breast cancer patients.
Keywords in English
Breast cancer
Breast neoplasms
Cultured tumor cells
Dendritic cell
Monocytes
Phenotypes
Tumoral microenvironment
Abstract in English
In breast cancer, the tumor metabolism, the action of estrogens antagonists can influence dendritic cells (DC) generation. The aim of this work was to evaluate the frequency of DCs in tumor tissue and the differentiation of DCs derived from peripheral blood mononuclear cells (PBMCs) and compared the phenotypic and functionally of these cells from healthy individuals and breast cancer patients. The results showed that patients PBMCs were unable to generate phenotypicaly, functionally mature DCs and presented larger production of interleukin 10 and higher expression of HSP27 when compared with healthy volunteers' DCs, presented higher production of Interferon-gamma. The p38 MAPK signaling pathway seems to be important in PBMCs differentiation into DCs, and its activation by stress can induce the synthesis of HSP27, that inhibits DC generation. The tamoxifen treatment caused modulation of membrane DC markers expression. Therefore, these results show that patients' DCs present phenotypic and functional alterations which can be caused by tumor microenvironment.
 
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Publishing Date
2011-03-02
 
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