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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2013.tde-18062013-105357
Document
Author
Full name
Oriana Mayorga Nader
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Taborda, Carlos Pelleschi (President)
Benard, Gil
Camargo, Zoilo Pires de
Title in Portuguese
Análise de diferentes adjuvantes associados ao peptídeo P10 usados no tratamento de camundongos BALB/c infectados com Paracoccidioides brasiliensis.
Keywords in Portuguese
Paracoccidioides brasiliensis
Adjuvantes imunológicos
Fungos
Paracoccidioidomicose
Abstract in Portuguese
Paracoccidioidomicose (PCM) é uma doença sistêmica granulomatosa causada pelo fungo termo-dimórfico Paracoccidioides brasiliensis. A gp43 é o principal antígeno diagnóstico que contém o peptídeo de 15 aminoácidos designado como P10, que desenvolve a resposta imune do tipo Th1 dependente de IFN-g. No presente trabalho, comparamos a efetividade de diferentes adjuvantes em camundongos BALB/c infectados intratraquealmente com o isolado virulento Pb18. Alúmen, Adjuvante Completo e Incompleto de Freund, FliC flagelina e o lipídeo catiônico, foram testados em associação ou não com P10. Após 52 dias de infecção, o lipídeo catiônico mostrou os melhores resultados, com o menor número de UFCs, redução de fibrose e baixo número de células fúngicas no tecido pulmonar, além do incremento significativo de IFN-g e TNF-a e a redução dos níveis de IL-4 e IL-10. Estes resultados sugerem que a interação do peptídeo P10 com o lipídeo catiônico pode gerar uma melhor resposta imune mediada por células do tipo Th1, evitando a rápida disseminação da PCM experimental.
Title in English
Analysis of different adjuvants associated to P10 peptide for treatment of BALB/c infected mice with Paracoccidioides brasiliensis.
Keywords in English
Paracoccidioides brasiliensis
Fungi
Immunological adjuvants
Paracoccidioidomycosis
Abstract in English
Paracoccidioidomycosis (PCM) is a systemic granulomatous disease caused by the dimorphic fungus Paracoccidioides brasiliensis. The gp43 is the major diagnostic antigen that contains the peptide P10. This peptide has 15 amino acids and develops a Th1- dependent IFN-g immune response. In this work, we compare the effectiveness of different adjuvants in BALB/c mice infected intratracheally with virulent isolate Pb18. Alum, Complete Adjuvant and Incomplete Freund's adjuvant, fliC flagellin from Salmonella enterica and cationic lipid were tested in combination or not with P10. After 52 days of infection, the cationic lipid showed the best results with the least number of colony forming units, reduction of fibrosis, low number of fungal cells in lung tissue and the significant increase of IFN-g and TNF-a with reduced levels of IL-4 and IL-10. These results suggest that, the interaction of peptide P10 with cationic lipids can lead to a better immune response mediated by Th1 type cells by avoiding the rapid spread of experimental PCM.
 
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Publishing Date
2013-10-01
 
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