Estudo da via Wnt no endométrio normal e no câncer de endométrio, em mulheres após a menopausa

Abstract

The Wnt family is involved in tumorigenesis of several tissues as well in embriogenesis. In order to analize the canonical and noncanonical Wnt pathway in atrophic endometrium and endometrial adenocarcinoma, we evaluated the immunohistochemical expression of Wnt1, Frizzled-1 (FZD1), Wnt5a, Frizzled-5 (FZD5) and ƒÀ-catenin. Endometrial specimens were obtained from surgeries performed between 1995 and 2005 and the patients were divided in two groups: Group A, atrophic endometrium (N = 15); Group B, endometrial adenocarcinoma (N = 45). Immunoreactivity for Wnt1, FZD1, Wnt5a, FZD5 and ƒÀ-catenin was scored for each group. For the expression of Wnt1, FZD1 and Wnt5a, no significant association was observed between the groups. A significant association was observed between the groups for the FZD5 expression (p = 0.001). The proportion of FZD5 positive women was significantly higher for group A (80.0%) compared to group B (31.1%). Regarding the survival curve for FZD5 at group B, we found no significant association between positive and negative women. No significant association was observed between s-catenin expression and the patient group since the expression for groups A and B were 100% and 95.6%, respectively (p = 1.000). FZD5 is downregulated in type I endometrial adenocarcinoma when compared to atrophic endometrium.

A familia de genes Wnt esta envolvida na carcinogenese de diversos tecidos e na embriogenese. Para avaliar as vias Wnt canonica e nao-canonica no endometrio atrofico e no cancer de endometrio, avaliamos a expressao imuno-histoquimica do Wnt1, Frizzled-1 (FZD1), Wnt5a, Frizzled-5 (FZD5) e ƒÀ-catenina. O tecido endometrial foi retirado de pecas cirurgicas de pacientes operadas entre 1995 e 2005 na Escola Paulista de Medicina . UNIFESP e foram divididas em dois grupos: grupo A, endometrio atrofico (n=15) e grupo B, adenocarcinoma de endometrio (n=45). A imunorreacao do Wnt1, FZD1, Wnt5a, FZD5 and ƒÀ-catenina foi analisada em escores em cada grupo, individualmente. A expressao do Wnt1, FZD1 e Wnt5a nao teve associacao significante entre os grupos. Associacao significante foi observada entre os grupos para a expressao do FZD5 (p = 0,001). A proporcao do FZD5 positivo foi significativamente maior no grupo A (80,0%) comparado ao grupo B (31,1%). Analisando a curva de sobrevida para o FZD5 no grupo B, nao encontramos associacao significante entre as mulheres positivas e negativas. A expressao da scatenina nao foi significante, sendo a expressao para os grupos A e B 100% e 95.6%, respectivamente (p = 1,000). FZD5 tem menor expressao no adenocarcinoma de endometrio tipo I quando comparado ao endometrio atrofico.