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Doctoral Thesis
DOI
https://doi.org/10.11606/T.9.2018.tde-05032018-172654
Document
Author
Full name
José Roberto Fogaça de Almeida
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2018
Supervisor
Committee
Almeida, Sandro Rogerio de (President)
Batista, Wagner Luiz
Brito, Cyro Alves de
Bezerra, Leila Maria Lopes
Title in Portuguese
Caracterização e avaliação da capacidade protetora dos peptí­deos imunogênicos de Sporothrix brasiliensis
Keywords in Portuguese
Esporotricose
Imunoproteômica
Sporothrix brasiliensis
Vacina
Abstract in Portuguese
A esporotricose é uma doença crônica que envolve o tecido subcutâneo afetando seres humanos e animais, causada pelo fungo termodimórfico Sporothrix spp.. A esporotricose é endêmica na América latina, principalmente no Brasil que teve o maior surto zoonótico já registrado, ocorrendo na cidade do Rio de Janeiro. A espécie Sporothrix brasiliensis é a mais diagnosticada no surto e a mais virulenta entre as especies de Sporothrix spp., causando formas mais graves da doença. A esporotricose em gatos é endêmica, fatal e um dos principais fatores pelo alto número de casos no Rio de Janeiro. O tratamento é longo e não vem sendo o suficiente para conter o número de casos da doença. Uma vacina contra a esporotricose poderia mudar esse paradigma no Brasil. O presente trabalho obteve o proteoma da cepa S. brasiliensis 5110 por meio de uma eletroforese 2D, e caracterizou e identificou as possíveis proteínas imunogênicas do fungo por espectrometria de massa. Por meio de programas de predição, foi avaliado e sintetizado 7 sequências de aminoácidos,das proteínas identificadas com maiores chances de se acoplar a molécula MHC de classe II. Apenas 3 foram capazes de induzir proliferação in vitro, os peptídeos ZR3, ZR4 e ZR8, que foram utilizados como vacina na esporotricose subcutânea e avaliados sua eficácia por meio da carga fúngica, diâmetro das lesões, perfil celular e níveis de citocinas. Neste trabalho concluímos que o peptídeo ZR8 foi o melhor candidato à vacina na esporotricose, pois foi capaz de diminuir o diâmetro das lesões, aumentar os níveis de citocinas protetoras (IFN-γ, IL-17A e IL-1β) e aumentar o número de células TCD4+ e CD3-/CD19+, sendo assim induzindo uma resposta imunológica protetora na esporotricose subcutânea.
Title in English
Characterization and evaluation of the protective capacity of the immunogenic peptides of Sporothrix brasiliensis.
Keywords in English
Immuneproteomics
Sporothrix brasiliensis
Sporotrichosis
Vacine
Abstract in English
Sporotrichosis is a chronic disease, which involves the subcutaneous tissue affecting humans and animals caused by the thermodymorphic fungus Sporothrix spp. Sporotrichosis is endemic in Latin America, mainly in Brazil that had the largest zoonotic outbreak ever recorded, occurring in the city of Rio de Janeiro. The Sporothrix brasiliensis is the species more diagnosed in the outbreak and most virulent, causing severe forms of the disease. Sporotrichosis in cats is endemic, fatal and the main factors due to the high number of cases of the disease in Rio de Janeiro. The treatment is long, and has not been enough to contain the number of cases of sporotrichosis. A vaccine against sporotrichosis could change this paradigm in Brazil. The present work obtained the proteome of S. brasiliensis 5110 strain by 2D electrophoresis, and characterized and identified possible immunogenic proteins by mass spectrometry. By prediction programs were evaluated and synthesized 7 peptide sequence from antigenic proteins that have the highest chances of coupling to the MHC class II molecule. From these 7 peptides only 3 were able to induce proliferation in vitro, called ZR3, ZR4 and ZR8 peptides, that were used as a vaccine in subcutaneous sporotrichosis and evaluated their efficacy through fungal load, lesion diameter, cell profile and cytokine levels. We conclude that ZR8 peptide was the best candidate for sporotrichosis vaccine, since it was able to decrease the lesion diameter, increase the levels of protective cytokines (IFN-γ, IL-17A and IL-1β) and increase the number of CD4+ T cells and CD3-/CD19+ inducing a protective immune response in subcutaneous sporotrichosis.
 
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Publishing Date
2018-03-12
 
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