Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-06-11T19:45:55Z No. of bitstreams: 1 470271 - Texto Completo.pdf: 601264 bytes, checksum: 631a8bec7a15cd2f97fae4e0bb07768a (MD5) / Made available in DSpace on 2015-06-11T19:45:55Z (GMT). No. of bitstreams: 1 470271 - Texto Completo.pdf: 601264 bytes, checksum: 631a8bec7a15cd2f97fae4e0bb07768a (MD5) Previous issue date: 2015-03-24 / The esophageal and oral tumors are classified as the most frequent malignancies in Brazil. Esophageal cancer is the eighth most common in the world and oral cancer is ranked as the 5th among malignant neoplasms affecting man in Brazil. The lipopolysaccharide (LPS) are characteristic compounds of the cell wall of gram-negative bacteria. They are able to regulate gene expression of pro-inflammatory cytokines by binding to toll-like receptor 4 (TLR4) via NF-kB pathway. Recent studies show that LPS can increase the migration ability of cell lines of human esophageal cancer HKESC-2 by increasing its binding properties. In the meantime, it has not been tested the effect of LPS on esophageal cancer cells OE19 and OE21 and human oral carcinoma HN30. Thus, this study aimed to determine the action of LPS compounds on the proliferation and viability of cell lines of human esophageal cancer and human oral carcinoma HN30. Were used as treatment LPS for OE19 and OE21 cell lines and the PgLPS (lipopolysaccharide of Porphyromonas gingivalis) for HN30 cell line. Cell viability was assessed using the MTT assay and cell counting. The TLR4 expression by real-time PCR was also evaluated. LPS at higher concentrations decreased significantly cell viability in both cell lines, adenocarcinoma (OE19) and squamous esophageal carcinoma (OE21) at different times of treatment. In addition, both cell lines, OE19 and OE21, expressed TLR4 receptor. Taken together, our data demonstrated that LPS at high concentrations might contribute to tumor death, in agreement with previously data. / Os tumores de es?fago e de boca est?o classificados como as neoplasias malignas mais frequentes no Brasil. O c?ncer de es?fago ? o oitavo mais comum no mundo e o c?ncer de boca ? classificado como o 5? dentre as neoplasias malignas que afetam o homem no Brasil. Os lipopolissac?ridos (LPS) s?o compostos caracter?sticos da parede celular de bact?rias gram-negativas. Eles s?o capazes de regular a express?o de genes de citocinas pr?-inflamat?rias, atrav?s da liga??o ao receptor toll-like 4 (TLR4) via NF-kB. Estudos recentes mostram que o LPS pode aumentar a habilidade de migra??o de linhagens c?lulares de c?ncer de es?fago humano HKESC-2 atrav?s do aumento de suas propriedades de ades?o. Entretanto, ainda n?o foi testado o efeito do LPS sobre as c?lulas de c?ncer de es?fago e de carcinoma oral humano HN30. Deste modo, este estudo teve como objetivo determinar a a??o dos compostos de LPS (derivado de bact?rias) sobre a prolifera??o e viabilidade de linhagens celulares de c?ncer de es?fago humano, e de carcinoma oral humano. Foram utilizados como tratamento o LPS para as linhagens OE19 e OE21 e o PgLPS (lipopolissacar?deo da Porphyromonas gingivalis) para a linhagem HN30. A viabiliadade celular foi avaliada utilizando o ensaio MTT e contagem celular. Tamb?m foi avaliada a express?o do receptor TLR4 por PCR em tempo real. LPS em concentra??es mais elevadas reduziu significativamente a viabilidade celular em ambas as linhagens celulares de c?ncer de es?fago, o adenocarcinoma (OE19) e o carcinoma de c?lulas escamosas (OE21) em diferentes tempos de tratamento. Al?m disso, ambas as linhagens celulares, OE19 e OE21, expressaram o receptor TLR4. Avaliados em conjunto, os nossos dados demonstram que o LPS em concentra??es elevadas pode contribuir para a morte tumoral, de acordo com dados pr?vios.

Made available in DSpace on 2015-04-14T14:51:36Z (GMT). No. of bitstreams: 1 462325.pdf: 1364561 bytes, checksum: 19bc55cdfda395e1b4a89ba3de34a12a (MD5) Previous issue date: 2014-08-06 / Esophageal cancer is the eighth most common cancer worldwide. The prognosis for this cancer is poor, generally, the overall survival rate is 10-15% with about five years of survival. Adenosine is present in different tissues of various organisms and plays an extremely important role in the purinergic system. Adenosine is produced directly or indirectly by ATP and its target P1 receptors which are G-protein coupled (A1, A2A, A2B and A3). Caffeine is a non-selective adenosine antagonist and has low affinity for A3 great affinity for A1, A2A and A2B. The objective of this study was to investigate the role of P1 purinergic receptors and the action of caffeine on the proliferation of squamous cell carcinoma of the esophagus, using the human lineage of squamous cell esophageal OE21. First we demonstrated that P1 receptors are expressed in the cell line by means of qRT-PCR and still A2A receptor expression was significantly reduced when these cells were treated with caffeine (100 &#956;M). In addition to the caffeine treatment also decreases cell proliferation (1, 5 e 10 mM) and this effect was most likely a type of non-apoptotic cell death. Similarly, adenosine decreases cell viability (1, 5 and 10 mM) and proliferation (5 mM) via apoptosis and dipyridamole (10 &#956;M) affect cell viability and did not alter the type of death caused. These results demonstrate the in vitro investigation of adenosine and caffeine in esophageal cancer receptors and this is a first step to understanding of purinergic signaling in esophageal cancer. / O c?ncer de es?fago ? o oitavo c?ncer mais comum no mundo. O progn?stico para esse tipo de c?ncer ? ruim, geralmente, a taxa de sobreviv?ncia global ? de 10-15% com cerca de cinco anos de sobrevida. A adenosina est? presente em diferentes tecidos de v?rios organismos e tem um papel extremamente importante no sistema purin?rgico. Ela ? produzida direta ou indiretamente atrav?s do ATP e tem como alvo receptores purin?rgicos P1 que s?o acoplados ? prote?na G (A1, A2A, A2B e A3). A cafe?na ? um antagonista n?o seletivo de adenosina e tem baixa afinidade pelos receptores A3 e grande afinidade pelos receptores A1, A2A e A2B. O objetivo deste trabalho foi investigar o papel dos receptores purin?rgicos P1 e a a??o da cafe?na e da adenosina na prolifera??o de carcinoma de c?lulas escamosas de es?fago, utilizando a linhagem humana de carcinoma de c?lulas escamosas de es?fago OE21. Primeiro demonstramos que os receptores P1 est?o expressos na linhagem celular atrav?s de qRT-PCR, e que a express?o do receptor A2A foi significativamente reduzida (p<0,05) quando essas c?lulas foram tratadas com cafe?na (100 &#956;M). Em adi??o o tratamento com a cafe?na tamb?m diminui significativamente a viabilidade (1, 5 e 10 mM) das c?lulas e este efeito foi provavelmente um tipo de morte celular n?o-apopt?tica. De modo semelhante, a adenosina diminui a viabilidade celular (1, 5 e 10 mM) e a prolifera??o (5 mM) atrav?s de apoptose, e o dipiridamol (10 &#956;M) afetou a viabilidade celular e n?o alterou o tipo de morte causada. Estes resultados demonstram, atrav?s de investiga??o in vitro, a a??o dos receptores P1 adenosina e da cafe?na no c?ncer de es?fago e este ? um primeiro passo para entender de sinaliza??o purin?rgica no c?ncer de es?fago.