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Previous issue date: 2005-11-04 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Oral squamous cell carcinoma (OSCC) is the most common malignancy in oral cavity and human papillomavirus (HPV) may have an important role in its development. The aim of this experiment was to investigate the HPV DNA and viral types in 90 cases of OSCC. Moreover, a comparative analysis between the cases of OSSC with and without HPV DNA was performed by using cell cycle markers p21 and pRb in order to detect a possible correlation of these proteins and HPV infection. DNA was extracted from paraffin embedded tissue and amplified by PCR (polymerase chain reaction) with primers PCO3+ e PCO4+ for a fragment of human β-globin gene. After this procedure, PCR for HPV DNA detection was realized using a pair of generic primers GP5+ e GP6+. Immunohistochemical study was performed by streptoavidin-biotin technique and antibodies against p21 and pRb proteins were employed. Eighty-eight cases were positive for human β-globin gene and HPV DNA was found in 26 (29.5%) of then. It could not be detected significant correlation between HPV and age, sex and anatomical sites of the lesion. The most prevalent viral type was HPV 18 (80.8%). Regarding the immunohistochemical analysis, it was detected significant association between HPV presence and pRb immunoexpression (p=0,044), nevertheless, the same was not observed in relation to p21 protein (p =0,416). It can be concluded that the low detection of HPV DNA in OSCC by the present experiment suggests a possible role of the virus in the development and progression in just a subset of this disease / O carcinoma epiderm?ide oral ? a neoplasia maligna mais freq?ente da cavidade oral e o papilomav?rus humano (HPV) parece ter um relevante papel na indu??o desta les?o. Neste trabalho investigou-se o DNA do HPV e tipos virais em 90 casos de carcinoma epiderm?ide oral (CEO). Realizou-se tamb?m uma an?lise comparativa entre os grupos de CEO com DNA do HPV e sem o DNA do v?rus, empregando-se os marcadores do ciclo celular p21 e pRb, a fim de estabelecer poss?vel correla??o entre a express?o imuno-histoqu?mica dessas prote?nas e a infec??o pelo HPV. O DNA foi extra?do de tecido emblocado em parafina e amplificado por PCR (rea??o em cadeia da polimerase) com um par de primers designados PCO3+ e PCO4+ para um fragmento do gene da β-globina humana. Posteriormente, realizou-se PCR para detec??o do DNA de HPV utilizando-se um par de primers gen?ricos designados GP5+ e GP6+. A tipagem viral foi realizada pela hibridiza??o dot blot. No m?todo imuno-histoqu?mico utilizou-se a t?cnica da streptavidina-biotina com um painel de anticorpos monoclonais para as prote?nas p21 e pRb. Dos 88 casos positivos para o gene da β-globina humana, em 26 (29,5%) foi detectado o DNA do HPV. N?o houve associa??o significativa entre o HPV e as vari?veis idade e sexo dos pacientes e localiza??o anat?mica da les?o. O tipo viral prevalente foi o HPV 18 (80,8%). Quanto ? an?lise imuno-histoqu?mica, foi observada associa??o estatisticamente significativa entre a presen?a do HPV e a express?o imunohistoqu?mica de pRb (p=0,044), entretanto, n?o houve qualquer diferen?a estatisticamente significativa entre a express?o da prote?na p21 e a presen?a do v?rus (p =0,416). P?de-se concluir que o baixo percentual de detec??o do DNA do HPV no carcinoma epiderm?ide oral no presente trabalho, sugere uma poss?vel participa??o do HPV no desenvolvimento e progress?o de apenas um subgrupo dessas les?es
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17157 |
| Date | 04 November 2005 |
| Creators | Soares, Rosilene Calazans |
| Contributors | http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787928A2, Nunes, F?bio Daumas, CPF:00413156850, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4703945Y8, Ramalho, Luciana Maria Pedreira, CPF:53489667549, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4796917Z6&dataRevisao=null, Medeiros, S?lvia Regina Batistuzzo de, CPF:32398336468, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4781004Y8, Souza, L?lia Batista de, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787927Z7&dataRevisao=null, Pinto, Le?o Pereira |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Patologia Oral, UFRN, BR, Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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