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Doctoral Thesis
DOI
https://doi.org/10.11606/T.60.2006.tde-17052007-101538
Document
Author
Full name
Lucia de Paula
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2006
Supervisor
Committee
Faccioli, Lucia Helena (President)
Baruffi, Marcelo Dias
Netto, Antonio Ruffino
Nomizo, Auro
Sartori, Alexandrina
Title in Portuguese
Comparação de diferentes sistemas de liberação da vacina DNA-hsp65 na indução de proteção contra tuberculose em cobaias
Keywords in Portuguese
inflamação
Mycobacterium tuberculosis
proteção
tuberculose
vacina de DNA
Abstract in Portuguese
As grandes mudanças para os pesquisadores da área de vacinas sao a optimizaçao das vacinas de DNA para uso em humanos ou animais de grande porte e criar vacinas efetivas de uma única dose usando sistemas de liberação controlada apropriados. O plasmídeo de DNA codificando a proteína de heatshock 65 (hsp65) (DNA-hsp65) foi capaz de induzir resposta imune protetora e terapêutica no modelo murino da tuberculose (TB). Apesar do sucesso da vacina baseada na DNA-hsp65 em solução para proteger camundongos contra TB, esta requer múltiplas doses de grande quantidade de DNA para imunização efetiva. No intuito de otimizar esta vacina e simplificar o protocolo de vacinação, nós co-encapsulamos DNA-hsp65 e o adjuvante dimicolato de trealose (DMT) em microesferas biodegradáveis de ácido polilático-poliglicólico (PLGA) para uma única administração. Além disso, foi também desenvolvida uma formulação prime-boost da vacina de dose única baseada na mistura de duas diferentes microesferas de PLGA, apresentando liberação rápida e lenta, de DNAhsp65 e proteína hsp65 recombinante, respectivamente. Essas formulações foram testadas em cobaias pela comparação da eficácia protetora (components efetores da imunidade protetora) e toxicidade (componentes efetores da patologia) induzida pela preparação da preparação do DNA em solução ou BCG. A formulação de dose única prime-boost nitidamente apresentou maior eficácia e reduziu a patologia nos pulmões de cobaias.
Title in English
Comparison of BCG and different delivery systems of DNAhsp65 vaccine for the induction of protection against tuberculosis in guinea pigs
Keywords in English
DNA vaccine
inflammation
Mycobacterium tuberculosis
protection
tuberculosis
Abstract in English
The great challenges for researchers working in the field of vaccinology are optimizing DNA vaccines for use in humans or large animals and creating effective single-dose vaccines using appropriated controlled delivery systems. Plasmid DNA encoding the heat-shock protein 65 (hsp65) (DNAhsp65) has been shown to induce protective and therapeutic immune responses in a murine model of tuberculosis (TB). Despite the success of naked DNAhsp65-based vaccine to protect mice against TB, it requires multiple doses of high amounts of DNA for effective immunization. In order to optimize this DNA vaccine and simplify the vaccination schedule, we coencapsulated DNAhsp65 and the adjuvant trehalose dimycolate (TDM) into biodegradable poly(DLlactide- co-glycolide) (PLGA) microspheres for a single dose administration. Moreover, a single-shot prime-boost vaccine formulation based on a mixture of two different PLGA microspheres, presenting faster and slower release of, respectively, DNAhsp65 and the recombinant hsp65 protein was also developed. These formulations were tested in guinea pigs by comparison with the efficacy (effector components of protective immunity) and toxicity (effector components of pathology) induced by the naked DNA preparation or BCG. The single-shot prime-boost formulation clearly presented good efficacy and diminished lung pathology in guinea pigs.
 
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Publishing Date
2007-05-21
 
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