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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2013.tde-06112013-110001
Document
Author
Full name
Bianca Marigliani
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Cianciarullo, Aurora Marques (President)
Kubrusly, Flavia Saldanha
Silva, Ismael Dale Cotrim Guerreiro da
Title in Portuguese
Caracterização de partículas semelhantes ao vírus HPV16 produzidas em células HEK293T.
Keywords in Portuguese
Colo uterino
Neoplasias
Papillomavirus
Proteínas recombinantes
Vacinas
Vírus oncogênicos
Abstract in Portuguese
O HPV (Papilomavírus Humano) causa verrugas anogenitais e alguns tipos de câncer, como o câncer de colo do útero. Seu capsídeo é composto pelas proteínas L1 e L2. A L1 se autoestrutura em VLPs, utilizadas nas atuais vacinas comerciais. Para a geração de vacinas com maior espectro de proteção, a L2 é promissora, pois gera proteção cruzada. Para caracterizar VLPs de L1L2 do HPV16, células HEK293T cotransfectadas tiveram a expressão proteica analisada por citometria de fluxo, Western blotting, microscopia confocal a laser e eletrônica de transmissão. As proteínas L1 (60kDa) e L2 (100kDa) estavam presentes no núcleo e no citoplasma celular, formando VLPs de L1L2 de conformação heterogênea, cuja máxima expressão ocorre 12h após a transfecção. As VLPs extraídas estavam em diferentes estágios de estruturação. Foi possível estabelecer um sistema eficaz de produção heteróloga das proteínas de VLPs de L1L2, que poderão ser utilizadas em testes pré-clínicos, na pesquisa básica e contribuir no desenvolvimento de uma vacina profilática de amplo espectro de ação contra o HPV.
Title in English
Characterization of HPV16 virus-like particles produced in HEK293T cells
Keywords in English
Cervix
Neoplasms
Oncogenic viruses
Papillomavirus
Recombinant proteins
Vaccines
Abstract in English
HPV (Human Papillomavirus) is the causative agent of anogenital warts and several types of cancer, as cervical cancer. The HPV capsid is composed of L1 and L2 proteins. L1 can self-assemble into VLPs (virus-like particles), the basis for HPV commercially available vaccines. To generate broad-spectrum vaccines L2 shows the greatest promise, due to cross-protection. To characterize VLPs composed of HPV16 L1 and L2 proteins, cotransfected HEK293T cells were analyzed by flow cytometry, confocal laser scanning microscopy, transmission electron microscopy and Western blotting. Proteins L1 (60kDa) and L2 (100kDa) were present in cell nucleus and cytoplasm, forming heterologous L1L2 VLPs with highest expression at 12h post-transfection. Extracted VLPs were at different maturation stages. It was possible to establish an efficient system of heterologous L1, L2 and L1L2 VLPs production. After some adjustments in protocols, these particles could be used in preclinical tests, HPV basic research and also in the development of an HPV broad-spectrum vaccine.
 
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Publishing Date
2014-01-17
 
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