Made available in DSpace on 2014-12-17T15:32:18Z (GMT). No. of bitstreams: 1 CyntiaCPC.pdf: 2470782 bytes, checksum: 4619c7ffcab85bffa54a732d30786d99 (MD5) Previous issue date: 2010-02-24 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Currently, bone morphogenetic proteins (BMPs) have effective participation in the growth of malignancies. Knowing that there are few studies involving BMPs and oral squamous cell carcinoma, this work constitutes an immunohistochemical study of BMP-2, BMPR IA and BMPR II in squamous cell carcinomas (SCC) of the lower lip relating to the clinical and pathological aspects of this lesion. The sample consisted of 40 cases of SCC of the lower lip, being 20 cases of SCC of the lower lip with regional metastasis and 20 cases without metastasis. We evaluated the intensity of expression (score 1 to mark absent / weak, score 2 for high ) and was found the percentage of labeled cells, where the score was 1 cases with 0 to 50% of positive cells, score 2 with 51 to 75% of positive cells, and score 3 more than 75% of positive cells. The sample comprised 72.5% of men with a mean age of 65.8 years, there was a predominance of stage II and 52.5% of the carcinomas were classified as low grade, being carcinoma with metastasis presenting most cases (70%) as carcinomas of high malignancy grade (p = 0.004). The largest number of cases of SCC of the lower lip that were in stages I / II (61, 9%) were classified as carcinomas of low grade malignancy and carcinomas in stages III / IV were classified as high-grade tumors (p = 0, 024). The BMP-2 showed strong intensity of immunostaining in 82.5%, BMPR-IA showed 55% of cases with an intensity of immunostaining absent / weak and BMPR-II showed 85% of cases with an intensity of immunostaining absent / weak. Only the protein BMPR-IA were significantly associated with all clinic-pathological parameters studied, metastasis (p <0.001), TNM (p <0.001) and histological grade of malignancy with (p = 0.028). The percentage of positive cells, all markers showed the highest number of cases with more than 75% of positive cells (score 3) and only BMPR-II showed statistical difference when related to the presence and absence of metastasis (p = 0.049 ). We conclude that there is disturbance in the BMP signaling pathway in EC-mediated lower lip and that high expression of BMP-2 associated with the expression of BMPR-IA and BMPR-II are associated with metastasis in carcinoma / Atualmente as prote?nas morfogen?ticas do osso (BMPs) t?m efetiva participa??o no crescimento de neoplasias malignas. Sabendo que s?o escassos os trabalhos envolvendo BMPs e o carcinoma epiderm?ide oral, este trabalho realizou um estudo imunoistoqu?mico da BMP-2, BMPR IA e BMPR II em carcinomas epiderm?ides (CE) de l?bio inferior relacionando com os aspectos clinico-patol?gicos desta les?o. A amostra constou de 40 casos de CE de l?bio inferior, sendo 20 casos de CE de l?bio inferior com met?stase linfonodal regional e 20 casos sem met?stase. A grada??o histol?gica de malignidade foi realizada no front invasivo da les?o. Foi avaliada a intensidade de express?o (escore 1 para marca??o ausente/ fraca e escore 2 para marca??o forte), bem como foi verificado a porcentagem de c?lulas positivas, onde o escore 1 era os casos com 0 a 50% das c?lulas positivas; escore 2 com 51 a 75% das c?lulas positivas; e escore 3 com mais de 75% das c?lulas positivas. A amostra foi composta por 72,5% de homens com a m?dia de idade de 65,8 anos, houve um predom?nio do est?gio II e 52,5% dos carcinomas foram classificados como de baixo grau, sendo os carcinomas com met?stase regional apresentando a maioria dos casos (70%) como carcinomas de alto grau de malignidade (p =0,004). O maior n?mero de casos de CE de l?bio inferior que estavam nos est?gios I/ II (61, 9%) foi classificado em carcinomas de baixo grau de malignidade e os carcinomas nos est?gios III/ IV foram classificados em alto grau de malignidade (p =0, 024). A BMP-2 apresentou intensidade da imunomarca??o forte em 82,5%, BMPR-IA observou-se 55% dos casos com intensidade de imunomarca??o ausente/ fraca e a BMPR-II revelou 85% dos casos com intensidade de imunomarca??o ausente/ fraca. Apenas a prote?na BMPR-IA apresentou associa??o estatisticamente significante com todos os par?metros clinico-patol?gicos estudados, met?stase (p<0,001), TNM (p<0,001) e grada??o histol?gica de malignidade com ( p=0,028). Quanto ? porcentagem de c?lulas positivas, todos os marcadores apresentaram o maior n?mero de casos com mais de 75% das c?lulas positivas (escore 3) e apenas a BMPR-II apresentou diferen?a estat?stica quando relacionada com a presen?a e aus?ncia de met?stase (p=0,049). Conclui-se que existe dist?rbio na via de sinaliza??o BMP-mediada no CE de l?bio inferior e que a alta express?o da BMP-2 associada com a express?o da BMPR-IA e BMPR-II est?o relacionadas com a met?stase neste carcinoma

Made available in DSpace on 2014-12-17T15:32:22Z (GMT). No. of bitstreams: 1 KaruzaMAP.pdf: 544780 bytes, checksum: e0fadeed7d2d1ec7568970935306d05c (MD5) Previous issue date: 2006-02-22 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The Human Papillomavirus (HPV) has been strongly implicated on development of some cases of oral squamous cell carcinoma (OSCC). However, the immunological system somehow reacts against the presence of this virus. Among the cells involved on such mechanism of defense detaches the Langerhans cells (LC), which are responsible for processing and presenting antigens. The purpose of this study was to evaluate the immunohistochemical reactivity for Langerhans cells between HPV positive and HPV negative OSCC, as well as, the relation of the immunoreactivity for this cells and the histological grading of malignancy proposed by Bryne (1998) and modified by Miranda (2002). Additionally, HPV infection was evaluated in relation to sex, age, lesion localization and histological grading of malignancy. In the total, 27 cases of OSSC were evaluated, 09 of them HPV positive and 18 HPV negative. Anti S-100 antibody was utilized for the immunohistochemical labelling, followed by the counting of LCs in 5 highpower fields (400x). No statistically significant difference was verified between the variables sex, age, lesion localization, histological grading of malignancy and HPV presence in OSSC. There was neither association between the immunohistochemical labeling for LCs (S-100+) and HPV infection nor correlation between the quantity of LCs labeled and the histological grading of malignancy of OSSC. The results suggest that despite the absence of statistically significant difference, the presence of HPV in such cases of OSCC can alter the immunological system, particularly the Langerhans cells / O Papilomav?rus Humano (HPV) tem sido implicado fortemente no desenvolvimento de alguns carcinomas epiderm?ides orais (CEOs). Contudo, o sistema imunol?gico reage de alguma forma ? presen?a desse v?rus. Dentre as c?lulas envolvidas nesse mecanismo de defesa, destaca-se a c?lula de Langerhans (CL), por serem c?lulas processadoras e apresentadoras de ant?genos. O objetivo desse estudo foi avaliar a marca??o imuno-histoqu?mica das c?lulas de Langerhans entre os casos de CEOs HPV positivos e negativos, bem como a rela??o da imunomarca??o dessas c?lulas e a grada??o histol?gica de malignidade proposta por Bryne (1998) e modificada por Miranda (2002). Adicionalmente, a infec??o pelo HPV foi estudada com rela??o ao sexo, idade, localiza??o da les?o e a grada??o histol?gica de malignidade. Foram analisados 27 casos de CEOs, sendo 09 destes HPV positivos e 18 casos negativos. Para a marca??o imuno-histoqu?mica utilizou-se o anticorpo anti S-100, sendo as CLs quantificadas em 5 campos de maior aumento (400x). A an?lise estat?stica revelou n?o existir rela??o das vari?veis, sexo, idade, localiza??o da les?o e grada??o histol?gica, com a presen?a do HPV nos CEOs estudados. N?o existiu associa??o entre a marca??o imuno-histoqu?mica das CLs(S-100+) e a infec??o pelo HPV, e tamb?m n?o houve correla??o entre as CLs imunomarcadas e a grada??o histol?gica nos casos de CEOs analisados. Diante desses resultados, pode-se sugerir que mesmo n?o havendo diferen?a significativa, a presen?a do HPV nos casos de carcinoma epiderm?ide oral pode alterar o sistema imune, particularmente as c?lulas de Langerhans

Made available in DSpace on 2014-12-17T15:32:24Z (GMT). No. of bitstreams: 1 JoaoAVGF.pdf: 1413564 bytes, checksum: f5d8ea2da8907cd551169a4091430007 (MD5) Previous issue date: 2006-02-17 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Squamous cell carcinoma is the most common malignant neoplasm in the oral cavity, accounting for more than 90% of all malignancies in this location. Cyclooxygenases (COX s) are key enzymes on arachidonic acid metabolism and prostaglandin synthesis, being expressed basically in two forms: the constitutive (COX-1) and the inducible (COX-2). Increased levels on the expression of COX-2 have been implicated in the pathogenesis tumor progression of various forms of human cancer, including oral squamous cell carcinoma, some of what suggesting a possible interaction between COX-2 and the protein expressed by the tumor suppressor gene p53, mutated in more than 50% of all human cancers. The mean of the present research consisted in analyze the correlation between the expression of COX-2 and p53, at the protein level, as well as evaluate the difference on the expression of these two proteins with the histological grading of malignancy. 34 cases of oral squamous cell carcinoma were selected and graded according to the histological grading system proposed by Bryne (1998) and the labeling indexes (LI s) for COX-2 and p53 evaluated using immunohistochemistry method. The results revealed that COX-2 was expressed in increased levels in most of the specimens, although there was no statistic significant correlation between LI s from COX-2 and p53 (p>0.05), and there were no statistical differences on the expression of these proteins between tumors of high and low grade of malignancy (p>0.05). Interestingly, the expression of COX-2 and p53 was detected in fragments of dysplastic oral epithelium adjacent to tumor areas, on basal and suprabasal layers. The absence of statistical correlation between the expression of COX-2 and p53 proteins do not rule ot the existence of a relation between them, were it may reflect the diversity of regulatory pathways between both, different direct and indirect inhibitory effects of COX-2 over p53, as well as the wide range of activation macheenisms for COX-2 and mutational status of the p53 gene Another conclusion point that the increased expression of COX-2 observed in oral squamous cell carcinomas suggest a role for this protein in the processes of pathogenesis and tumoral evolution of this malignant neoplasm / O carcinoma epiderm?ide ? a neoplasia maligna mais comum na cavidade oral, representando mais de 90% das malignidades nesta localiza??o. As cicloxigenases (COX s) s?o enzimas chave no metabolismo do ?cido aracd?nico e s?ntese de prostaglandinas, sendo expressas basicamente sob duas formas: uma constitutiva (COX-1) e uma induzida (COX-2). N?veis elevados na express?o da COX-2 t?m sido implicados na patog?nese e progress?o tumoral em diversos tipos de c?ncer em humanos, incluindo o carcinoma epiderm?ide oral, alguns dos quais sugerindo uma poss?vel intera??o entre a COX-2 e a prote?na expressa pelo gene supressor tumoral p53, mutado em mais de 50% de todos c?nceres humanos. O prop?sito da presente pesquisa consistiu em analisar a correla??o entre a express?o de COX-2 e p53, em n?vel de prote?na, bem como avaliar a diferen?a na express?o destas duas prote?nas em rela??o ao grau histol?gico de malignidade. Para tal, foram selecionados 34 casos de carcinoma epiderm?ide oral, os quais foram classificados de acordo com o sistema de grada??o histol?gica de malignidade proposto por Bryne (1998) e cujos ?ndices de positividade para COX-2 e p53 foram avaliados atrav?s da t?cnica imuno-histoqu?mica. O resultados revelaram que a COX-2 esteve expressa em n?veis elevados na maior parte dos esp?cimes analisados, embora n?o se tenha verificado correla??o estatisticamente significativa entre os IP s da COX-2 e da p53 (p>0,05), tampouco diferen?a estatisticamente significativa entre a express?o destas prote?nas entre tumores de alto e baixo grau de malignidade (p>0,05). Interessantemente, foi detectada a express?o da COX-2 e da p53 em fragmentos de epit?lio oral displ?sico, nas camadas basal e parabasal, adjacentes ao tumor. A aus?ncia de correla??o estat?stica entre a express?o das prote?nas COX-2 e p53 n?o descarta a exist?ncia de uma rela??o entre as mesmas, podendo refletir a diversidade de vias regulat?rias entre ambas, os diferentes efeitos inibit?rios diretos e indiretos da COX-2 sobre a p53, bem como os in?meros mecanismos de ativa??o da COX-2 e o estado mutacional do gene p53. Conclui-se ainda que a elevada express?o da COX-2 observada em carcinomas epiderm?ides orais sugere um papel desta prote?na dentro dos processos de patog?nese e evolu??o tumoral desta neoplasia maligna