The destruction complex of beta-catenin in colorectal carcinoma and colonic adenoma.

OBJECTIVE: To evaluate the destruction complex of beta-catenin by the expression of the proteins beta-catetenin, adenomatous polyposis coli, GSK3ß, axin and ubiquitin in colorectal carcinoma and colonic adenoma. METHODS: Tissue samples from 64 patients with colorectal carcinoma and 53 patients with colonic adenoma were analyzed. Tissue microarray blocks and slides were prepared and subjected to immunohistochemistry with polyclonal antibodies in carcinoma, adjacent non-neoplastic mucosa, and adenoma tissues. The immunoreactivity was evaluated by the percentage of positive stained cells and by the intensity assessed through of the stained grade of proteins in the cytoplasm and nucleus of cells. In the statistical analysis, the Spearman correlation coefficient, Student's t, χ2, Mann-Whitney, and McNemar tests, and univariate logistic regression analysis were used. RESULTS: In colorectal carcinoma, the expressions of beta-catenin and adenomatous polyposis coli proteins were significantly higher than in colonic adenomas (p<0.001 and p<0.0001, respectively). The immunoreactivity of GSK3ß, axin 1 and ubiquitin proteins was significantly higher (p=0.03, p=0.039 and p=0.03, respectively) in colorectal carcinoma than in the colonic adenoma and adjacent non-neoplastic mucosa. The immunohistochemistry staining of these proteins did not show significant differences with the clinical and pathological characteristics of colorectal cancer and colonic adenoma. CONCLUSIONS: These results suggest that, in adenomas, the lower expression of the beta-catenin, axin 1 and GSK3ß proteins indicated that the destruction complex of beta-catenin was maintained, while in colorectal carcinoma, the increased expression of beta-catenin, GSK3ß, axin 1, and ubiquitin proteins indicated that the destruction complex of beta-catenin was disrupted. OBJETIVO: Avaliar o complexo de destruição da betacatenina no carcinoma colorretal e no adenoma do colo pela expressão das proteínas betacatenina, adenomatous polyposis coli, GSK3ß, axina e ubiquitina. MÉTODOS: Amostras de tecidos de 64 doentes com carcinoma colorretal e de 53 pacientes com adenoma do colo foram analisadas. Blocos de tecidos foram submetidos ao estudo imuno-histoquímico com anticorpos policlonais nos tecidos do carcinoma, mucosa não neoplásica adjacente e adenoma. A imunorreatividade foi avaliada pela porcentagem de positividade de células coradas e pela intensidade do grau de coloração das proteínas no citoplasma e no núcleo das células. Na análise estatística, foram utilizados o coeficiente de correlação de Spearman, os testes t de Student, χ2, Mann-Whitney e de McNemar, e a análise de regressão logística univariada. RESULTADOS: No carcinoma colorretal, as expressões da betacatenina e da adenomatous polyposis coli foram significativamente maiores do que em adenomas do colo (p<0,001 e p<0,0001, respectivamente). A imunorreatividade das proteínas GSK3ß, axina 1 e ubiquitina foi significativamente maior (p=0,03, p=0,039 e p=0,03, respectivamente) no carcinoma colorretal do que no adenoma e na mucosa não neoplásica adjacente. A coloração imuno-histoquímica dessas proteínas não apresentou diferenças significantes em relação às características clinicopatológicas do câncer colorretal e do adenoma. CONCLUSÕES: Em adenomas, as menores expressões de betacatenina, axina 1 e GSK3ß indicaram que o complexo de destruição da betacatenina estava conservado, enquanto que, no carcinoma colorretal, o aumento das expressões da betacatenina, GSK3ß, 1 axina, e ubiquitina indicaram que o complexo de destruição de betacatenina estava alterado.

The destruction complex of beta-catenin in colorectal carcinoma and colonic adenoma / O complexo destruidor de betacatenina no carcinoma colorretal e no adenoma cólico

ABSTRACT Objective To evaluate the destruction complex of beta-catenin by the expression of the proteins beta-catetenin, adenomatous polyposis coli, GSK3β, axin and ubiquitin in colorectal carcinoma and colonic adenoma. Methods Tissue samples from 64 patients with colorectal carcinoma and 53 patients with colonic adenoma were analyzed. Tissue microarray blocks and slides were prepared and subjected to immunohistochemistry with polyclonal antibodies in carcinoma, adjacent non-neoplastic mucosa, and adenoma tissues. The immunoreactivity was evaluated by the percentage of positive stained cells and by the intensity assessed through of the stained grade of proteins in the cytoplasm and nucleus of cells. In the statistical analysis, the Spearman correlation coefficient, Student’s t, χ2, Mann-Whitney, and McNemar tests, and univariate logistic regression analysis were used. Results In colorectal carcinoma, the expressions of beta-catenin and adenomatous polyposis coli proteins were significantly higher than in colonic adenomas (p<0.001 and p<0.0001, respectively). The immunoreactivity of GSK3β, axin 1 and ubiquitin proteins was significantly higher (p=0.03, p=0.039 and p=0.03, respectively) in colorectal carcinoma than in the colonic adenoma and adjacent non-neoplastic mucosa. The immunohistochemistry staining of these proteins did not show significant differences with the clinical and pathological characteristics of colorectal cancer and colonic adenoma. Conclusions These results suggest that, in adenomas, the lower expression of the beta-catenin, axin 1 and GSK3β proteins indicated that the destruction complex of beta-catenin was maintained, while in colorectal carcinoma, the increased expression of beta-catenin, GSK3β, axin 1, and ubiquitin proteins indicated that the destruction complex of beta-catenin was disrupted.

RESUMO Objetivo Avaliar o complexo de destruição da betacatenina no carcinoma colorretal e no adenoma do colo pela expressão das proteínas betacatenina, adenomatous polyposis coli, GSK3β, axina e ubiquitina. Métodos Amostras de tecidos de 64 doentes com carcinoma colorretal e de 53 pacientes com adenoma do colo foram analisadas. Blocos de tecidos foram submetidos ao estudo imuno-histoquímico com anticorpos policlonais nos tecidos do carcinoma, mucosa não neoplásica adjacente e adenoma. A imunorreatividade foi avaliada pela porcentagem de positividade de células coradas e pela intensidade do grau de coloração das proteínas no citoplasma e no núcleo das células. Na análise estatística, foram utilizados o coeficiente de correlação de Spearman, os testes t de Student, χ2, Mann-Whitney e de McNemar, e a análise de regressão logística univariada. Resultados No carcinoma colorretal, as expressões da betacatenina e da adenomatous polyposis coli foram significativamente maiores do que em adenomas do colo (p<0,001 e p<0,0001, respectivamente). A imunorreatividade das proteínas GSK3β, axina 1 e ubiquitina foi significativamente maior (p=0,03, p=0,039 e p=0,03, respectivamente) no carcinoma colorretal do que no adenoma e na mucosa não neoplásica adjacente. A coloração imuno-histoquímica dessas proteínas não apresentou diferenças significantes em relação às características clinicopatológicas do câncer colorretal e do adenoma. Conclusões Em adenomas, as menores expressões de betacatenina, axina 1 e GSK3β indicaram que o complexo de destruição da betacatenina estava conservado, enquanto que, no carcinoma colorretal, o aumento das expressões da betacatenina, GSK3β, 1 axina, e ubiquitina indicaram que o complexo de destruição de betacatenina estava alterado.

[Evaluation of efficacy, safety and tolerability rabeprazole in treatment of acid-peptic diseases ]. / Avaliação da eficácia, segurança e tolerabilidade de rabeprazol no tratamento de doenças ácido-pépticas.

BACKGROUND: Rabeprazole, a substituted benzimidazole, represents a new generation of proton pump inhibitors that has recently been approved by the FDA and European Union for treatment of acid-related diseases. OBJECTIVES: To assess the efficacy and tolerability of rabeprazole 20 mg in actual conditions of use in everyday clinical practice on subjects with diagnosis of erosive gastroesophageal reflux disease and/or gastric and/or duodenal ulcer. PATIENTS/METHODS: A total of 171 outpatients (55% men, 45% women) with a mean age of 42.5 years were enrolled in this trial. The majority of subjects (81.0%) were Caucasians. Patients with endoscopically confirmed erosive/ulcerative gastroesophageal reflux disease (Savary-Miller classification), duodenal ulcer and/or benign gastric ulcer were eligible to receive rabeprazole 20 mg once daily for 4 to 8 weeks, depending on the diagnosis and at investigators' discretion. Patients were requested to record their symptoms in a diary card in a daily basis. RESULTS: One hundred and sixty two patients completed the study in accordance with the protocol. Reflux esophagitis was diagnosed in 78 (48.1%) patients, duodenal ulcer in 39 (24.1%) and gastric ulcer in 24 (14.8%). Eleven (6.8%) patients presented reflux esophagitis associated with duodenal ulcer and 7 (4.3%) associated with gastric ulcer. Finally, 3 (1.9%) presented both gastric and duodenal ulcer. Fifty-three percentage of patients were free of symptoms on the first day of treatment and 89.5% after a week. The healing rate was 84.4% for patients with reflux esophagitis, 90.6% for duodenal ulcer and 90.9% for gastric ulcer. The adverse effects were minimal and transitory. CONCLUSIONS: Rabeprazole is highly effective and well tolerated in acute healing of reflux esophagitis and peptic ulcers. In addition, it provides fast symptoms relief.

Avaliação da eficácia, segurança e tolerabilidade de rabeprazol no tratamento de doenças ácido-pépticas / Evaluation of efficacy, safety and tolerability rabeprazole in treatment of acid-peptic

Rabeprazole, a substituted benzimidazole, represents a new generation of proton pump inhibitors that has recently been approved by the FDA and European Union for treatment of acid-related diseases. OBJECTIVES: To assess the efficacy and tolerability of rabeprazole 20 mg in actual conditions of use in everyday clinical practice on subjects with diagnosis of erosive gastroesophageal reflux disease and/or gastric and/or duodenal ulcer. PATIENTS/METHODS: A total of 171 outpatients (55% men, 45% women) with a mean age of 42.5 years were enrolled in this trial. The majority of subjects (81.0%) were Caucasians. Patients with endoscopically confirmed erosive/ulcerative gastroesophageal reflux disease (Savary-Miller classification), duodenal ulcer and/or benign gastric ulcer were eligible to receive rabeprazole 20 mg once daily for 4 to 8 weeks, depending on the diagnosis and at investigators' discretion. Patients were requested to record their symptoms in a diary card in a daily basis. RESULTS: One hundred and sixty two patients completed the study in accordance with the protocol. Reflux esophagitis was diagnosed in 78 (48.1%) patients, duodenal ulcer in 39 (24.1%) and gastric ulcer in 24 (14.8%). Eleven (6.8%) patients presented reflux esophagitis associated with duodenal ulcer and 7 (4.3%) associated with gastric ulcer. Finally, 3 (1.9%) presented both gastric and duodenal ulcer. Fifty-three percentage of patients were free of symptoms on the first day of treatment and 89.5% after a week. The healing rate was 84.4% for patients with reflux esophagitis, 90.6% for duodenal ulcer and 90.9% for gastric ulcer. The adverse effects were minimal and transitory. CONCLUSIONS: Rabeprazole is highly effective and well tolerated in acute healing of reflux esophagitis and peptic ulcers. In addition, it provides fast symptoms relief