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Previous issue date: 2013-12-18 / Fibrosis is a chronic liver disease that is a major cause of human mortality and is characterized by the accumulation of extracellular matrix in response to chronic liver injury. Important causes of chronic liver injury are: viral hepatitis, metabolic diseases, autoimmune diseases and exposure to chemicals, such as alcohol or drugs. The GRX cells are a representative line of hepatic stellate cells (HSC), which is associated with development of fibrosis, in the last stage is the cirrhosis. In healthy liver, these cells exhibit a phenotype or quiescent lipocyte characterized by its hability to store lipid droplets. Gallic acid is involved in several biological processes such as cell growth inhibition and apoptosis also has a variety of pharmacological actions, including antioxidant activity, anti-inflammatory, antimicrobial and antitumor. The aim of this study was to investigate the in vitro effects of gallic acid on the phenotype of HSC. The results showed that gallic acid is able to reduce cell proliferation, induce quiescent phenotype in HSCs by increasing lipid droplets, probably by activating peroxisome proliferator-activated receptor gama, decrease of transforming growth factor 1 signaling and decreased expression of collagen type I. These results demonstrate that the gallic acid may be a novel therapeutic agent for treating hepatic fibrosis. / A fibrose ? uma doen?a cr?nica do f?gado que representa uma das maiores causas de mortalidade humana e ? caracterizada pelo ac?mulo de matriz extracelular em resposta ? les?o hep?tica cr?nica. Importantes causas de les?es hep?ticas cr?nicas s?o: hepatites virais, doen?as metab?licas, doen?as autoimunes e exposi??o a subst?ncias qu?micas, como ?lcool ou drogas. As c?lulas GRX s?o uma linhagem representativa das c?lulas estreladas hep?ticas (HSC), que est? associada ao desenvolvimento da fibrose que, em ?ltimo est?gio, ? a cirrose. No f?gado saud?vel, estas c?lulas apresentam um fen?tipo quiescente ou lipoc?tico, caracterizado pela sua capacidade de armazenar got?culas lip?dicas. O ?cido g?lico est? envolvido em v?rios processos biol?gicos, tais como a inibi??o do crescimento celular e apoptose, al?m de possuir uma variedade de a??es farmacol?gicas, incluindo as atividades antioxidantes, anti-inflamat?rias, antimicrobiana e antitumoral. O objetivo deste estudo foi investigar os efeitos in vitro do ?cido g?lico sobre o fen?tipo das HSC. Os resultados obtidos mostraram que o ?cido g?lico ? capaz reduzir a prolifera??o celular, induzir o fen?tipo quiescente nas HSCs pelo aumento de got?culas lip?dicas, provavelmente pela ativa??o do receptor ativado por proliferador de peroxissomo gama, bloqueio da sinaliza??o de fator de transforma??o do crescimento beta 1 e diminui??o da express?o do col?geno tipo I. Estes resultados demonstram que o ?cido g?lico pode ser um novo agente terap?utico para o tratamento de fibrose hep?tica.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1755 |
| Date | 18 December 2013 |
| Creators | Schuster, Aline Daniele |
| 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, BR, Faculdade de Medicina |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Unknown |
| 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, 500, 600, -8624664729441623247 |
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