Papel do receptor B1 de cininas na patogênese da periodontite experimental.
Data
2013
Autores
Gonçalves-Zillo, Thais Oliveira 
Orientadores
Pesquero, João Bosco
Tipo
Tese de doutorado
Título da Revista
ISSN da Revista
Título de Volume
Resumo
Objetivo: A patogenese da doenca periodontal envolve diferentes aspectos da imunidade e da remodelacao ossea. Assim, o objetivo deste estudo foi avaliar o papel do receptor B1 de cininas (B1R) na periodontite experimental e osteoclastogenese. Material e Metodos: Foi utilizado um modelo experimental de periodontite induzida por ligadura (PEx) em camundongos nocautes para o B1R (B1R-/-) para testar o papel deste receptor na modulacao da perda ossea in vivo. A analise ex vivo dos linfonodos submandibulares confirmou a ativacao do linfocitos T no modelo de ligadura. O efeito autonomo da delecao do B1R foi avaliado em osteoclastos diferenciados a partir de precursores da medula ossea de camundongos. Resultados: Os camundongos B1R-/- exibiram aumento da perda ossea alveolar e aumento da secrecao de interleucina (IL) - 17 ex vivo nos linfonodos submantibulares em resposta a PEx, quando comparados ao animal selvagem (Wt). A analise ex vivo dos linfondos submandibulares revelou niveis de fator de necrose tumoral (TNF)-α reduzidos, enquanto a quantidade de interferon (IFN)-γ permaneceu inalterada. A PEx, entretanto, nao foi capaz de modificar os niveis de IL-10 em animais B1R-/-. Os osteoclastos de camundongos B1R-/- apresentaram aumento do numero de celulas multinucleadas, positivas para a coloracao com a fosfatase acida resistente ao tartrato (TRAP+) quando comparado com o tipo selvagem. O uso de inibidor da enzima conversora de angiotensina, enzima que degrada cininas, como uma estrategia farmacologica para aumentar a disponibilidade de cininas, reduziu a destruicao do osso em ratos e camundongos. Conclusao: Juntos, os nossos resultados indicam que o B1R participa na patogenese da perda ossea induzida por ligadura, demonstrando, assim, o seu papel no desenvolvimento da doenca periodontal.
Aim : The pathophysiology of periodontal diseases involves different aspects of immunity and bone remodeling. Thus, the purpose of this study was to evaluate the role of kinin B1 receptor (B1 R - / - ) in experimental periodontitis and osteoclastogenesis. Material and Methods: Here we used a model of ligature- induced experimental periodontitis (PEx) in mice lacking B1 R (B1 R - / - ) to test the role of this receptor in modulating bone loss in vivo. Ex vivo analysis of submandible lymph nodes were used to confirm T lymphocyte activation. Autonomous effect of B1 R deletion was evaluated in primary osteoclasts precursor from mouse bone marrow. Results: B1 R - / - mice exhibit increased bone loss and increased interleukin (IL) - 17 secretion by lymphnode cells in response to PEx when compared to wild type, whereas tumor necrosis factor (TNF) - α levels were decreased and interferon (IFN)- γ remained unaltered. PEx failed to modify IL - 10 levels in B1 R - / - . Osteoclasts from B1R - / - mice also displayed increased differentiation into functional multinucleated tartrate - resistant acid phosphatase - positive (TRAP+) osteoclasts when compared to wild type. Furthermore, treatment of mice or rats with angiotensin - converting enzyme (ACE) inhibitor, a pharmacological strategy to increase kinin availability once ACE degrades kinins into inactive peptides, could prevent bone destruction. Conclusion: Taken together, our results indicate that B1R participates in the pathogenesis of ligature - induced bone loss, thereby demonstrating its role in the development of periodontal disease
Aim : The pathophysiology of periodontal diseases involves different aspects of immunity and bone remodeling. Thus, the purpose of this study was to evaluate the role of kinin B1 receptor (B1 R - / - ) in experimental periodontitis and osteoclastogenesis. Material and Methods: Here we used a model of ligature- induced experimental periodontitis (PEx) in mice lacking B1 R (B1 R - / - ) to test the role of this receptor in modulating bone loss in vivo. Ex vivo analysis of submandible lymph nodes were used to confirm T lymphocyte activation. Autonomous effect of B1 R deletion was evaluated in primary osteoclasts precursor from mouse bone marrow. Results: B1 R - / - mice exhibit increased bone loss and increased interleukin (IL) - 17 secretion by lymphnode cells in response to PEx when compared to wild type, whereas tumor necrosis factor (TNF) - α levels were decreased and interferon (IFN)- γ remained unaltered. PEx failed to modify IL - 10 levels in B1 R - / - . Osteoclasts from B1R - / - mice also displayed increased differentiation into functional multinucleated tartrate - resistant acid phosphatase - positive (TRAP+) osteoclasts when compared to wild type. Furthermore, treatment of mice or rats with angiotensin - converting enzyme (ACE) inhibitor, a pharmacological strategy to increase kinin availability once ACE degrades kinins into inactive peptides, could prevent bone destruction. Conclusion: Taken together, our results indicate that B1R participates in the pathogenesis of ligature - induced bone loss, thereby demonstrating its role in the development of periodontal disease
Descrição
Citação
ZILLO, Thais Oliveira Gonçalves. Papel do receptor B1 de cininas na patogênese da periodontite experimental. 2013. 74 f. Tese (Doutorado em Biologia Molecular) – Escola Paulista de Medicina, Universidade Federal de São Paulo. São Paulo, 2013.