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Master's Dissertation
DOI
10.11606/D.9.2013.tde-27022014-101337
Document
Author
Full name
José Roberto Fogaça de Almeida
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Almeida, Sandro Rogerio de (President)
Benard, Gil
Lima, Maria Regina D'Imperio
Title in Portuguese
Avaliação da virulência e da resposta imune de diferentes espécies de Sporothrix sp. na esporotricose experimental
Keywords in Portuguese
Anticorpo monoclonal P6E7
Esporotricose
Gp70
Relação patógeno-hospedeiro
Sporothrix sp.
Abstract in Portuguese
Esporotricose é uma micose subcutânea, causada principalmente pelo fungo Sporothrix schenckii e a nova espécie Sporothrix brasiliensis. Foi relatado na literatura que os camundongos infectados com a cepa de S. schenckii M-64 produziu uma resposta imune mista, em que o soro dos camundongos infectados reagiram apenas com uma glicoproteína de 70 kDa (gp70), identificada como importante fator de virulência. Assim o presente trabalho visa avaliar a importância à virulência e eficácia do anticorpo monoclonal P6E7 em outras cepas do complexo Sporothrix. Camundongos foram infectados com as cepas de S. schenckii (1099-18 e 15383) e S. brasiliensis (5110 e 17943). Cada 7 dias, o baço e fígado foram retirados para a análise do UFC e citocinas. Foi realizado western blot com o soro dos camundongos infectados e com anticorpo monoclonal P6E7 utilizando o exoantígenos das diferentes cepas. Foi realizado protocolo de tratamento com o anticorpo P6E7 nos camundongos infectados, para a avaliação da carga fúngica no baço e no fígado. Análise de citocinas mostrou que as cepas de S. schenckii induziram uma resposta mista Th1/Th2, entretanto nos camundongos infectados com as cepas de S. brasiliensis, não foi observada produção significativa de citocinas. No western blot realizado com exoantígenos das cepas de Sporothrix sp. foi observado diferentes componentes antigênicos, quando o soro de camundongos infectados foi utilizado, porém a reação com anticorpo monoclonal contra a gp70 demonstrou que a gp70 estava presente apenas no exoantígeno da cepa mais virulenta 5110. Infecção realizada com todas as cepas demonstrou cronicidade pela análise UFC. O tratamento com o AcMo P6E7 foi eficaz no tratamento da esporotricose experimental, sendo capaz de diminuir a carga fúngica, principalmente no baço dos camundongos infectados.
Title in English
Immune response and virulence evaluation from different species of Sporothrix sp. in experimental sporotrichosis
Keywords in English
Gp70
Monoclonal antibody P6E7
Pathogen-host interaction
Sporothrix sp.
Sporotrichosis
Abstract in English
Sporotrichosis is a subcutaneous mycosis, caused mainly by fungi Sporothrix schenckii and the new specie Sporothrix brasiliensis. Was reported in previous studies that mice infected with low virulent S. schenckii M-64 strain, produced a mixed immune response, where the infected mice serum reacted only with a 70 kDa glycoprotein (gp70), identified as important virulence factor. Thus, the present study aims to evaluate the virulence importance and effectiveness of monoclonal antibody P6E7 in other Sporothrix complex strains. Mice were infected with Sporothrix yeast strain of S. schenckii (1099-18 and 15383) and S. brasiliensis (5110 and 17943). Each 7 days, the spleen and liver were taken for CFU and cytokines analysis. The western blot was performed with the serum obtained from infected mice and a monoclonal antibody P6E7 using exoantigens from different strains. Was performed treatment protocol with the monoclonal antibody P6E7 on infected mice, for spleen and liver fungal burden evaluation. Cytokine analysis showed that S. schenckii strains induce a mixed Th1/Th2 response, however in the S. brasiliensis strains wasn't observed significant cytokine production. In western blot accomplished with the strains exoantigens was observed different antigenic components when the infected mice serum was used, however with monoclonal antibody against gp70 demonstrated that gp70 was present only in most virulent strain 5110. Infection performed with all strains demonstrated chronicity for CFU analysis. Treatment with Mab P6E7 was effective in experimental sporotrichosis, with reducing capable of fungal load, mainly in the spleen of infected mice.
 
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Publishing Date
2014-03-24
 
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