Desenvolvimento de terapia alternativa usando adjuvantes nanoestruturados para o tratamento de tumor experimental

• Ano de defesa: 2016
• Autor(a) principal: Praxedes, Layanny Kelly Silveira
• Orientador(a): Amaral, André Corrêa
• Banca de defesa: Silveira, Lucimeire Antonelli da, Fonseca, Simone Gonçalves da, Machado, Julianea Reis
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Biologia das Interações PH (IPTSP)
• Departamento: Instituto de Patologia Tropical e Saúde Pública - IPTSP (RG)
• País: Brasil
• Palavras-chave em Português: Tumor; Nanopartícula; Hidróxido de alumínio; PLGA; Nanoparticle; Aluminum hydroxide
• Área do conhecimento CNPq: CIENCIAS BIOLOGICAS::PARASITOLOGIA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/5990

The capacity of the tumor has not present as immunogenic to the immune system is one of its escape mechanisms. The aim of this study was to evaluate the use of nanoparticles formed from poly Lactic-co-glycolic acid (PLGA) associated with aluminum hydroxide may potentiate the effect of these on the resolution of the tumor. Balb/c mice inoculated with Sarcoma 180 tumor cells were distributed into nine groups for the implementation of the various immunotherapeutic treatments involving the use of aluminum hydroxide, PLGA nanoparticles, and activated macrophages. The evaluation of the treatment was performed by analysis of the tumor, considering the weight reduction of the dissected tumor, morphological and histological analysis, and analysis of pro-inflammatory and immunosuppressive cytokines in the serum of mice. The group of mice treated with PLGA nanoparticle associated with aluminum hydroxide caused a significant regression of the tumor (p = 0.039) compared with untreated mice. The treatment involving macrophages and PLGA nanoparticles showed significant tumor regression compared to the group treated only with macrophages (p = 0.021). The groups that had significant tumor regression have high levels of IFN--4 and IL-10, differing from the profile found in the other groups. In the other treatments tested there was a reduction of the tumor mass, but without significant statistical results, and without changes in the levels of cytokines measured in the serum of animals. Therefore, it is believed that PLGA nanoparticle by their ability to release hydroxide in target cells controlled manner, can enhance the action of the adjuvant aluminum hydroxide. Further studies are needed to elucidate the mechanisms involved in this phenomenon, which support the other investigations