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000840998.pdf: 3047380 bytes, checksum: 4f011bacf1f109d530d0cddd6178474e (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Agonistas dos receptores Toll-like (TLRs) podem representar candidatos promissores a serem desenvolvidos como medicamentos contra o câncer. Atualmente, a terapia mais eficaz para o câncer de bexiga urinária não-músculo invasivo (CBNMI) é a imunoterapia com BCG (Bacillus Calmette-Guerin), embora sua utilização esteja limitada a efeitos colaterais de intensidades variadas. Diante deste cenário destaca-se o P-MAPA, que por sua grande versatilidade e mínima citoxicidade, abre uma nova perspectiva para o combate de alguns tipos de cânceres, incluindo o CBNMI. Assim, os objetivos principais deste estudo foram caracterizar os efeitos histopatológicos e moleculares da imunoterapia intravesical com P-MAPA envolvendo as vias de sinalização dos TLRs 2 e 4 no tratamento do CBNMI induzido quimicamente em camundongos selvagens (wild type - WT) e knockouts (-/-) para TLR4 e MyD88. Os efeitos da imunoterapia com P-MAPA foram comparados com o tratamento com BCG. Foram utilizados 20 camundongos fêmeas de cada linhagem (WT, TLR4-/- e MyD88-/-), todos com 60 dias de idade e mantidos no Centro de Medicina Nuclear da Faculdade de Medicina/USP - São Paulo. Os animais foram divididos em 4 grupos de 5 animais, para cada linhagem: Grupo Controle (CTL): recebeu uma dose intravesical de solução fisiológica por 3 semanas consecutivas; Grupo MNU: recebeu uma dose intravesical de N-metil-N-nitrosouréia (MNU) a cada 15 dias, totalizando 3 doses; Grupo MNU+BCG: recebeu uma dose intravesical de BCG por 3 semanas consecutivas; Grupo MNU+P-MAPA: recebeu uma dose intravesical de P-MAPA por 3 semanas consecutivas. Após 09 semanas de experimento, as bexigas urinárias foram coletadas e submetidas às análises histopatológicas e Western Blotting. O presente trabalho demonstrou que a imunoterapia com P-MAPA promoveu distinta ativação do sistema imune inato mediada por TLRs 2 e 4 em relação ao BCG, resultando no aumento da via de sinalização para... / Compounds that are able to act as Toll-like receptors (TLRs) agonists may represent promising candidates to be developed as drugs against cancer. Currently, the most effective therapy for non-muscle invasive bladder cancer (NMIBC) is immunotherapy with BCG (Bacillus Calmette-Guerin) associated with transurethral resection. However, the use of BCG is associated with side effects of varying strengths and in this scenario highlights the P-MAPA, which in great versatility and minimal cytotoxicity, opens a new perspective for fighting certain types of cancers, including NMIBC. Thus, the main objectives of this study were to characterize the histopathological and molecular effects of intravesical immunotherapy with P-MAPA involving the signaling pathways of TLRs 2 and TLR4 in the NMIBC treatment chemically induced in Wild Type mice (Wild Type - WT) and knockouts (-/-) for TLR4 and MyD88. The effects of P-MAPA immunotherapy were compared with BCG treatment. It were utilized 20 female mice of each strain (WT, TLR4 -/- and MyD88 -/-), all with 60 days of age and kept in the Nuclear Medicine Center, School of Medicine / USP - São Paulo. The animals were divided into 4 groups of 5 animals for each strain: Control Group (CTL): received intravesical dose of saline for 3 consecutive weeks; MNU Group: received a intravesical dose of N-methyl-N-Nitrosourea (MNU) every 15 days, a total of 3 doses; MNU+BCG Group: received received intravesical dose of BCG for 3 consecutive weeks; MNU+P-MAPA Group: received intravesical dose of P-MAPA for 3 consecutive weeks. After 09 weeks of experiment, urinary bladders were collected and submitted to histopathological and Western blotting analysis. The present study showed that P-MAPA immunotherapy led to distinct activation of the innate immune system TLR2 and 4-mediated when compared to BCG, resulting in increased signaling pathway for interferon (TRIF, IRF3, IFN-α and IFN-γ ) and restoration of the p53 protein ...
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/126574 |
| Date | 17 April 2015 |
| Creators | Rocha, Ana Beatriz Missio Vieira da [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Fávaro, Wagner José [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | 60 f. |
| Source | Aleph, reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -1, -1 |
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