RESUMO
Myoepithelial cells present a complex immunophenotype, with the expression of proteins varying according to the stage of normal or neoplastic differentiation of the cell. In order to evaluate the immunohistochemical markers expressed by these cells, a panel of antibodies composed of vimentin, calponin and HHF-35 was applied to 28 salivary gland tumors. The results demonstrated a higher percent sensitivity of vimentin and calponin compared to HHF-35. However, calponin and HHF-35 presented a focal labeling pattern in contrast with the diffuse distribution of vimentin. The cells predominantly stained by all tested antibodies included nonluminal cells in duct-like and tubular structures, such as those seen in pleomorphic adenomas and adenoid cystic carcinomas, as well as cells in the cords and nests of polymorphous low-grade adenocarcinomas and peripheral cells of sheets and nests of myoepitheliomas. In conclusion, the combination of calponin and vimentin is suggested for the identification of myoepithelial cells in salivary gland tumors.
Assuntos
Adenocarcinoma/metabolismo , Biomarcadores Tumorais/metabolismo , Carcinoma Adenoide Cístico/metabolismo , Proteínas Musculares/metabolismo , Mioepitelioma/metabolismo , Neoplasias das Glândulas Salivares/metabolismo , Actinas/metabolismo , Adenocarcinoma/patologia , Proteínas de Ligação ao Cálcio/metabolismo , Carcinoma Adenoide Cístico/patologia , Humanos , Imuno-Histoquímica , Proteínas dos Microfilamentos/metabolismo , Mioepitelioma/patologia , Neoplasias das Glândulas Salivares/patologia , Vimentina/metabolismo , CalponinasRESUMO
Myoepithelial cells present a complex immunophenotype, with the expression of proteins varying according to the stage of normal or neoplastic differentiation of the cell. In order to evaluate the immunohistochemical markers expressed by these cells, a panel of antibodies composed of vimentin, calponin and HHF-35 was applied to 28 salivary gland tumors. The results demonstrated a higher percent sensitivity of vimentin and calponin compared to HHF-35. However, calponin and HHF-35 presented a focal labeling pattern in contrast with the diffuse distribution of vimentin. The cells predominantly stained by all tested antibodies included nonluminal cells in duct-like and tubular structures, such as those seen in pleomorphic adenomas and adenoid cystic carcinomas, as well as cells in the cords and nests of polymorphous low-grade adenocarcinomas and peripheral cells of sheets and nests of myoepitheliomas. In conclusion, the combination of calponin and vimentin is suggested for the identification of myoepithelial cells in salivary gland tumors.
As células mioepiteliais apresentam um imunofenótipo complexo, variando a expressão de suas proteínas na dependência do seu estágio de diferenciação normal ou neoplásico. Com o objetivo de avaliar comparativamente marcadores imuno-histoquímicos para estas células, um painel de anticorpos composto pela vimentina, calponina e HHF-35 foi aplicado em 28 tumores de glândulas salivares. Os resultados demonstraram que a vimentina e a calponina foram percentualmente mais sensíveis que o HHF-35; entretanto, a calponina e o HHF-35 apresentaram padrão de distribuição focal diferentemente da distribuição difusa da vimentina. As células predominantemente marcadas, por todos os anticorpos utilizados, foram as não luminais presentes nas estruturas ductiformes e tubulares, vistas no adenoma pleomórfico e no carcinoma adenóide cístico, bem como as células dos cordões e ninhos dos adenocarcinomas polimorfo de baixo grau e periferia de lençóis e ninhos dos mioepiteliomas. Em conclusão, sugere-se que se faça associação da calponina com vimentina para identificação de células mioepiteliais em neoplasias de glândula salivar.