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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2009.tde-16072009-151128
Document
Author
Full name
Otto Luiz Dutra Cerqueira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Ferreira, Luis Carlos de Souza (President)
Ho, Paulo Lee
Vicente, Elisabete Jose
Title in Portuguese
Avaliação de diferentes sistemas de imunização que empregam a oncoproteína E7 do vírus papiloma humano tipo 16 (HPV 16) geneticamente fusionada à flagelina FliCd de Salmonella enterica sv. Muenchen.
Keywords in Portuguese
Células T CD8+
Flagelina
Microbiologia
Terapêutica
Vacinas
Abstract in Portuguese
O câncer cervical é o segundo maior responsável por mortes atribuídas a câncer em mulheres e dados epidemiológicos tem demonstrado a associação entre a infecção do HPV e o desenvolvimento da neoplasia. Sabe-se que num dado momento da infecção pelo HPV, ocorre integração do genoma viral ao genoma da célula hospedeira e consequente hiperexpressão de dois oncogenes virais, E6 e E7, o que contribui fortemente para a transformação celular. O presente trabalho propõe o uso de vacinas terapêuticas expressando a oncoproteína E7 do HPV-16 geneticamente fusionada à porção amino terminal da flagelina FliCd de Salmonella enterica sv müenchen; e verificação de seu possível papel adjuvante. Vacinas de DNA foram construídas de modo a direcionar as proteínas hibridas ao espaço intracitoplasmático. A verificação da expressão in vitro foi feita utilizando transfecções de culturas celulares, seguida de imunofluorescência e imunodetecção. Em seguida, essas construções vacinais foram administradas em camundongos C57BL6. Ensaios de ELISPOT foram feitos para mensuração o nível de linfócitos T secretores de IFN-g. Os dados de imunofluorescência e imunodetecção demonstraram a correta expressão da proteína. Ensaios de proteção realizados com 5 x 106 células TC-1 administrada por via subcutânea mostraram 80% de proteção em camundongos que haviam recebido previamente 4 doses das vacinas de DNA por biobalística. Ensaios de ELISPOT mostraram em média 9 células do baço secretoras de IFN-g por 106 células do baço (INF-g+/106) responsivas ao peptídeo CD8 / E7 de forma específica. Nossos dados sugerem que a formulação vacinal possui um efeito terapêutico significativo frente ao desafio com as células tumorais TC-1. Em paralelo, foi construída a cepa de salmonela vacinal SL FlaE7 que não mostrou efeito protetor frente ao desafio com células TC-1.
Title in English
Evaluation of different immunization systems thats use the oncoprotein E7 of the human Papiloma virus type 16 (HPV 16) genetically fused to the flagellin of the Salmonella enterica sv. muenchen.
Keywords in English
CD8 + T cells
Flagelin
Microbiology
Therapeutic
Vaccines
Abstract in English
The cervical cancer is the second major responsible for deaths attributed to cancer in women and epidemiologic data have been demonstrating the association between the infection of HPV and the development of this illness. It is known that in a certain moment of the infection with HPV, occurs the integration of the viral genome in the genome of the host cell and consequent over expression of two oncogenes, E6 and E7, it strongly contributes to the transformation of that cell. The present work proposes the use of DNA vaccines expressing the oncoprotein E7 of HPV-16 genetically fused to the portion A-terminal of the flagellin FliCd of Salmonella enterica sv müencheun and verification of your possible performance as adjuvant. The DNA vaccines were constructed in expression vector for eukaryotic to address the hybrid proteins to the intracitoplasmatic space. The verification of the expression in vitro was made using transfections of cellular cultures (COS-7) followed by immunofluorescence and western blot analyses. Soon after, those vaccines were injected in mice C57BL6 that were challenged then with 5^105 tumor cells TC-1 subcutaneous. ELISPOT assays were performed for measure the level of spleen cells secreting interferon g. The immunofluorescence and Western blot data are complementary demonstrating the correct expression of the protein. Protection assays showed 80% of protection in mice that had previously received 4 doses of the DNA vaccines in gene gun form. Assays of ELISPOT show 9 cells of the spleen secreting of IFN-g (average) for 106 cells of the spleen (INF-g /106). Our data suggest that the formulation of vaccines possesses a significant therapeutic effect front to the challenge with the tumor cells TC-1 accompanist splenocyte IFN-g secretory.
 
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Publishing Date
2009-08-20
 
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