Navegando por Palavras-chave "Beta catenina"

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    Análise da via de sinalização WNT no câncer gástrico pela imunoexpressão das proteínas E-caderina, betacatenina, APC, TCF-4 e survivina
    (Universidade Federal de São Paulo (UNIFESP), 2016-12-21) Lins, Rodrigo Rego [UNIFESP]; Waisberg, Jaques [UNIFESP]; http://lattes.cnpq.br/8316985163665041; http://lattes.cnpq.br/6992906097701452; Universidade Federal de São Paulo (UNIFESP)
    Objective: To determine the expression of E-cadherin, betacatenin, APC, TCF-4 and survivin proteins in gastric adenocarcinoma tissues, to correlate this expression with clinicopathological parameters and to verify the possible participation of the Wnt signaling pathway in gastric carcinogenesis. Method: Clinical and anatomopathological data were collected from the medical records of 71 patients with gastric adenocarcinoma submitted to gastrectomy without neoadjuvant treatment. The material obtained in the surgery was submitted to immunohistochemical analysis to evaluate the expression of E-cadherin proteins (membrane and cytoplasm), betacatenin (membrane, cytoplasm and nucleus), APC, TCF-4 and survivin (cytoplasm and nucleus). The expression rate of each protein was analyzed according to its location in the cell and related to patient clinical and pathological variables of the tumor. Results: The expression rates of the proteins were as follows: E-cadherin (3% in the membrane, 63.6% in the cytoplasm), betacatenin (29.7% in the membrane, 23.4% in the cytoplasm, 3,1% in the nucleus), APC (94.9% in the cytoplasm, 89.8% in the nucleus), TCF-4 (25.4% in the cytoplasm, 19.4% in the nucleus) and survivin (93.9% in both cytoplasm and nucleus). There was a relationship between the expression of E-cadherin in the cytoplasm with female patients (p = 0.014), membrane betacatenin with female patients (p = 0.024), betacatenin in the cytoplasm with tumors <5cm in diameter (p = 0.041 ), APC in the cytoplasm with proximal tumors (p = 0.047), TCF-4 in the nucleus with diffuse type of Lauren classification (p = 0.017) and pT4 tumors (p = 0.002) and survivin both nucleus and cytoplasm with Lauren's intestinal tumors (p = 0.05). Conclusion: The Wnt/betacatenin is not involved in gastric carcinogenesis. However, the high frequency of survivin allows us to suggest that other signaling pathways must be involved in the transformation of gastric tissue. Positive TCF-4 immunoexpression in the cell nucleus is related to T4 gastric carcinomas and Lauren?s diffuse tumors. Positive immunoexpression of survivin in the nucleus of gastric carcinoma cells is related to Lauren?s intestinal tumors.
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    Expression Of E-Cadherin And Wnt Pathway Proteins Betacatenin, Apc, Tcf-4 And Survivin In Gastric Adenocarcinoma: Clinical And Pathological Implication
    (Colegio Brasileiro Cirurgia Digestiva-Cbcd, 2016) Lins, Rodrigo Rego [UNIFESP]; Oshima, Celina Tizuko Fujiyama [UNIFESP]; Oliveira, Levindo Alves de [UNIFESP]; Silva, Marcelo de Souza [UNIFESP]; Amaral Antonio Mader, Ana Maria; Waisberg, Jaques [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Background: Gastric cancer is the fifth most frequent cancer and the third most common cause of cancer-related deaths worldwide.It has been reported that Wnt/ betacatenin pathway is activated in 30-50% of these tumors. However,the deregulation of this pathway has not been fully elucidated. Aim: To determine the expression of E-cadherin, betacatenin, APC, TCF-4 and survivin proteins in gastric adenocarcinoma tissues and correlate with clinical and pathological parameters. Method: Seventy-one patients with gastric adenocarcinoma undergoing gastrectomy were enrolled. The expression of E-cadherin, betacatenin, APC, TCF-4 and survivin proteins was detected by immunohistochemistryand related to the clinical and pathological parameters. Results: The expression rates of E-cadherin in the membrane was 3%; betacatenin in the cytoplasm and nucleus were 23,4% and 3,1% respectively; APC in the cytoplasm was 94,6%; TCF-4 in the nucleus was 19,4%; and survivin in the nucleus 93,9%. The expression rate of E-cadherin was correlated with older patients (p=0,007), while betacatenin with tumors <5 cm (p=0,041) and APC with proximal tumors (p=0,047). Moreover, the expression of TCF-4 was significantly higher in the diffuse type (p=0,017) and T4 tumors (p=0,002). Conclusion: The Wnt/betacatenin is not involved in gastric carcinogenesis. However, the high frequency of survivin allows to suggest that other signaling pathways must be involved in the transformation of gastric tissue.