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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2008.tde-24112008-110813
Document
Author
Full name
Paulo Vitor Soeiro Pereira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Condino Neto, Antonio (President)
Carvalho, Beatriz Tavares Costa
Franco, Marcelo de
Title in Portuguese
BAY 41-2272: um imunomodulador com potencial para o controle de infecções.
Keywords in Portuguese
Biologia
Biologia Celular
Imunologia celular
Abstract in Portuguese
A ativação dos fagócitos é crítica para a defesa contra vários patógenos, por isso a importância de estudos que desenvolvam alternativas para a ativação dessas células. Nosso estudo visou investigar os efeitos do BAY 41-2272 na ativação de fagócitos. Para este propósito avaliamos a fagocitose, liberação de superóxido e atividade microbicida. Foram usados PBMC, neutrófilos e a linhagem celular THP-1, cultivadas na presença ou ausência de BAY 41-2272 (1mM ou 3mM) por 1h ou 48h a 37°C. A liberação de superóxido foi avaliada pelo ensaio da redução do citocromo c inibido especificamente pela superóxido dismutase; a fagocitose foi analisada através da co-cultura com partículas de Zymosan e contagem das células com partículas englobadas; e a atividade microbicida foi mensurada por meio da co-cultura com E. coli enteropatogênica seguida pela contagem das CFU formadas pelas bactérias recuperadas dos fagócitos. Além disso, fizemos a dosagem de IL-12, IFN-g e TNF-a e a análise da expressão gênica do gene CYBB. Todos os tipos celulares responderam aos tratamentos. Os PBMC, neutrófilos e THP-1 tratados com BAY 41-2272 produziram significativamente mais superóxido (cerca de 50% mais), e apresentaram significativamente maior atividade fagocítica (cerca de 54% mais), microbicida (cerca do dobro) comparados ao grupo controle não tratado, além de produzir TNFa. Ainda, o tratamento com o fármaco aumentou a expressão do gene da gp91phox nas THP-1 e PBMC. BAY 41-2272, especialmente na dose de 3mM, mostrou um grande potencial na ativação dos fagócitos em vários aspectos. Este potencial pode ser explorado na busca por novas terapias destinadas ao controle de infecções, principalmente no caso das imunodeficiências.
Title in English
BAY 41-2272: potential immunomodulator to control infections.
Keywords in English
Biology
Cellular biology
Cellular immunology
Abstract in English
Phagocyte activation is critical role for host defense against several pathogens, so that studies developing alternatives for activating these cell are very important. We investigated the effects of BAY 41-2272 on phagocytes activation. For this purpose we evaluated several aspects indicating cellular activation, as phagocytosis, superoxide release and microbicidal activity. We used PBMC, neutrophils and THP-1 cell lineage cultured or not with BAY 41-2272 (1mM and 3mM) for 1h or 48h at 37°C. Superoxide release was tested by superoxide dismutase-inhibitable cytochrome c reduction assay; phagocytosis was evaluated through co-culture with zymosan particles and counting of ingested particles; and microbicidal activity was measured through co-incubation with enteropathogenic E. coli followed by counting of CFU from recovered bacteria from phagocytes. We analyzed the IL-12, IFN-g and TNF-a cytokine production and gp91phox gene expression. All cell types showed a response to treatments. PBMC, PMN and THP-1 treated with BAY 41-2272 produced significantly more superoxide (about 50% more), and presented significantly more phagocytic (about 54% more), microbicidal (about twice) activity than control group and production more TNF-a than control group. The expression of CYBB gene was more expressed on treated cells than control. BAY 41-2272, especially at 3mM, showed a great potential in activation of phagocytes in several aspects. This potential should be investigated at the light of new therapies seeking infection control, mainly in immunodeficiency.
 
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Publishing Date
2009-02-18
 
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