Increased toll-like receptors and p53 levels regulate apoptosis and angiogenesis in non-muscle invasive bladder cancer: mechanism of action of P-MAPA biological response modifier

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Garcia, Patrick Vianna ; Ferreira Seiva, Fabio Rodrigues ; Carniato, Amanda Pocol ; de Mello Junior, Wilson ; Duran, Nelson ; Macedo, Alda Maria ; de Oliveira, Alexandre Gabarra ; Romih, Rok ; Nunes, Iseu da Silva ; Nunes, Odilon da Silva ; Favaro, Wagner Jose

• Tipo de documento: Artigo Científico
• Fonte: BMC CANCER; v. 16, JUL 7 2016.
• Citações Web of Science: 9

Resumo

Background: The new modalities for treating patients with non-muscle invasive bladder cancer (NMIBC) for whom BCG (Bacillus Calmette-Guerin) has failed or is contraindicated are recently increasing due to the development of new drugs. Although agents like mitomycin C and BCG are routinely used, there is a need for more potent and/or less-toxic agents. In this scenario, a new perspective is represented by P-MAPA (Protein Aggregate Magnesium-Ammonium Phospholinoleate-Palmitoleate Anhydride), developed by Farmabrasilis (non-profit research network). This study detailed and characterized the mechanisms of action of P-MAPA based on activation of mediators of Toll-like Receptors (TLRs) 2 and 4 signaling pathways and p53 in regulating angiogenesis and apoptosis in an animal model of NMIBC, as well as, compared these mechanisms with BCG treatment. Results: Our results demonstrated the activation of the immune system by BCG (MyD88-dependent pathway) resulted in increased inflammatory cytokines. However, P-MAPA intravesical immunotherapy led to distinct activation of TLRs 2 and 4-mediated innate immune system, resulting in increased interferons signaling pathway (TRIF-dependent pathway), which was more effective in the NMIBC treatment. Interferon signaling pathway activation induced by P-MAPA led to increase of iNOS protein levels, resulting in apoptosis and histopathological recovery. Additionally, P-MAPA immunotherapy increased wild-type p53 protein levels. The increased wild-type p53 protein levels were fundamental to NO-induced apoptosis and the up-regulation of BAX. Furthermore, interferon signaling pathway induction and increased p53 protein levels by P-MAPA led to important antitumor effects, not only suppressing abnormal cell proliferation, but also by preventing continuous expansion of tumor mass through suppression of angiogenesis, which was characterized by decreased VEGF and increased endostatin protein levels. Conclusions: Thus, P-MAPA immunotherapy could be considered an important therapeutic strategy for NMIBC, as well as, opens a new perspective for treatment of patients that are refractory or resistant to BCG intravesical therapy. (AU)

• Processo FAPESP: 12/20706-2 - Novas estratégias terapêuticas para o câncer de bexiga urinária não-músculo invasivo: avaliação dos receptores de hormônios sexuais esteróides e espécies reativas de oxigênio sob os efeitos das imunoterapias intravesicais com BCG e P-mapa
• Beneficiário: Wagner José Fávaro
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/13585-4 - Efeitos das imunoterapias intravesicais com BCG e P-MAPA sobre os receptores de hormônios sexuais esteróides e espécies reativas de oxigênio: potenciais estratégias terapêuticas para o câncer de bexiga urinária
• Beneficiário: Patrick Vianna Garcia
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/05726-4 - Análises do estresse oxidativo, enzimas antioxidantes e sinalização via receptores toll-like 2 e 4 na progressão do câncer de bexiga urinária de ratos, frente às imunoterapias intravesicais com Bacilo Calmette-Guerin e P-MAPA
• Beneficiário: Fábio Rodrigues Ferreira Seiva
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado