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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2016.tde-17082016-094725
Document
Author
Full name
Elúzia Castro Peres Emidio
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Taborda, Carlos Pelleschi (President)
Ishida, Kelly
Rodrigues, Elaine Guadelupe
Title in Portuguese
Produção de melanina pelo fungo termodimórfico Paracoccidioides lutzii e análise da melanina como fator de virulência sobre a interface infecção - resposta imune.
Keywords in Portuguese
Paracoccidioides lutzii
Fator de virulência
Melanina
Paracoccidioidomicose
Abstract in Portuguese
A paracoccidioidomicose (PCM) é uma micose granulomatosa sistêmica, que tem como agentes etiológicos fungos dimórficos do gênero Paracoccidioides. A produção de melanina por vários fungos interfere no mecanismo da patogênese, como ocorre na paracoccidioidomicose. O presente projeto visou avaliar a produção de melanina pelos isolados de P. lutzii, e seus efeitos in vitro, avaliando o processo de fagocitose. Os resultados obtidos durante este trabalho mostraram que os isolados de P. lutzii (Pb01, Pb66, ED01, Pb1578 e Pb8334) melanizam de formas diferenciadas entre eles e quando comparados com isolados de P. brasiliensis (Pb60855, Pb18 e Pbcão). Ensaios de fagocitose, com os isolados Pb18, Pb60855 e Pb01, mostraram que a melanina reduziu a porcentagem de fagocitose das leveduras não tratadas de Pb18 e Pb60855, e o contrário aconteceu com Pb01. As análises dos perfis proteicos e enzimáticos dos isolados Pb18, Pb60855 e Pb01, permitiram determinar que o isolado Pb01 produz uma menor quantidade de proteínas que Pb18 e Pb60855 nas condições ensaiadas.
Title in English
Melanin production by the dimorphic fungus Paracoccidioides lutzii and analysis of melanin as a virulence factor in the interface infection - immune response.
Keywords in English
Paracoccidioides lutzii
Melanin
Paracoccidioidomycosis
Virulence factor
Abstract in English
Paracoccidioidomycosis (PCM) is a granulomatous systemic mycosis, whose etiological agents are dimorphic fungi of the genus Paracoccidioides. Melanin production by various fungi interferes in the mechanism of pathogenesis, as in paracoccidioidomycosis. Thus, this project aimed to evaluate the production of melanin by isolates of P. lutzii and its in vitro effects by assessing the process of phagocytosis. The results obtained during this work showed that the isolates of P. lutzii (Pb01, Pb66, ED01, Pb1578 and Pb8334) produce melanin in different ways between them and also when compared with isolates of P. brasiliensis (Pb60855, Pb18 and Pbcão). Phagocytosis assays, with Pb18, Pb60855 and Pb01, showed that melanin reduced the percentage of phagocytosis of untreated yeast of Pb60855 and Pb18 and the opposite happened with Pb01. The analysis of the protein and enzymatic profiles, of the isolates Pb18, Pb60855 and Pb01, enabled to determine that the isolated Pb01 produces a smaller amount of proteins compared with Pb18 and Pb60855 in the tested conditions.
 
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Publishing Date
2016-08-17
 
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