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Previous issue date: 2015-02-27 / Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The first line of defense of organism is made by phagocytic cells such as neutrophils. Apoptosis and NETosis of neutrophils are two major mechanisms of programmed cell death that differ in their morphological characteristics and effects on the immune system. Apoptosis is characterized by nuclear chromatin packaging and nuclear fragments and this death can be delayed by the presence of pathogens or chemicals components such as lipopolysaccharide (LPS). Neutrophils have other antimicrobial strategy, called neutrophil extracellular traps (NETs), which contributes to the elimination and control of the pathogen. NETosis is induced by infection, inflammation or trauma and represents an innate immune activation mechanism. The objective of this study was to evaluate the effect of Gallic acid (GA) in the control of apoptosis and release NETs. The results show that GA decreased the anti-apoptotic effect of LPS, blocked the induction of NETs and prevented the formation of free radicals induced by LPS. These findings demonstrate that the GA is a novel therapeutic agent for decreasing the exacerbated response of the body against an infectious agent. / A primeira linha de defesa do organismo ? feita por c?lulas fagoc?ticas como os neutr?filos. Apoptose e NETose dos neutr?filos s?o os dois maiores mecanismos de morte celular programada, que diferem em suas caracter?scas morfol?gicas e em seus efeitos sobre o sistema imune. A apoptose ? caracterizada pelo empacotamento da cromatina e dos fragmentos nucleares, por?m esta morte por ser atrasada pela presen?a de pat?genos ou pela presen?a de componentes qu?micos, como o lipopolissacar?deo (LPS). Os neutr?filos possuem outra estrat?gia antimicrobiana, chamada armadilhas extracelulares (NETs), que contribuem para elimina??o e controle do pat?geno. A NETose ? induzida por infec??o, inflama??o ou trauma e, representa um mecanismo de ativa??o da resposta imune inata. O objetivo deste estudo foi avaliar o efeito do ?cido g?lico (AG) no controle da apoptose e forma??o de NETs de neutr?filos. Os reultados mostram que o AG diminuiu o efeito anti-apopt?tico do LPS, bloqueou a libera??o de NETs e preveniu a forma??o de radicais livres induzidos por LPS. Estes resultados demonstram que o AG pode ser um novo agente terap?utico no controle da resposta exacerbada do corpo contra um agente infeccioso.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/5951 |
| Date | 27 February 2015 |
| Creators | Haute, Gabriela Viegas |
| Contributors | Oliveira, Jarbas Rodrigues de |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Medicina e Ci?ncias da Sa?de, PUCRS, Brasil, Faculdade de Medicina |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 7620745074616285884, 600, 600, 600, 600, 600, -8624664729441623247, -969369452308786627, -2555911436985713659, 2075167498588264571 |
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