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1.
Article in English | IMSEAR | ID: sea-154584

ABSTRACT

Context: Maspin is a novel serine protease inhibitor (serpin) with multifaceted tumor‑suppressive activities. It was originally identified in normal human breast myoepithelial cells and shows variable expression in different types of cancer cells. Maspin displays anti‑metastatic properties in mammary and prostate cancer. Its expression is maintained during ovarian, lung and pancreatic carcinogenesis, indicating that Maspin regulated metastatic potential is tissue specific. Thus, it is possible that Maspin participates in salivary gland tumor biology as well. In this study, expression pattern of maspin in benign and malignant salivary gland tumors is analyzed, to understand the biological behavior of salivary gland tumors with respect to maspin expression. Aims and Objectives: The aim of this study was to demonstrate, record, and correlate the expression pattern of maspin in benign and malignant salivary gland tumors. Settings and Design: A retrospective study of maspin expression in 30 diagnosed cases of benign and malignant salivary gland tumors retrieved from archives of our department. Materials and Methods: Anti‑maspin antibody and horseradish peroxidase detection system. Statistical Analysis: Descriptive statistical analysis and Chi‑square/Fisher Exact test. Results: Intense expression with P < 0.001 is associated with benign tumors, nuclear staining with P < 0.001 is significantly associated with benign tumors and cytoplasmic staining with P = 0.020 is associated with malignant tumors. Conclusion: Intensity of expression is more in benign tumors when compared with malignant tumors. The benign tumors showed both nuclear and cytoplasmic expression. Some malignant tumors did express maspin, but mainly in the cytoplasm.


Subject(s)
Immunohistochemistry/methods , Mammary Glands, Human/cytology , Salivary Gland Neoplasms/cytology , Salivary Gland Neoplasms/immunology , Serpins/metabolism
2.
Rev. chil. obstet. ginecol ; 77(1): 24-29, 2012. ilus
Article in Spanish | LILACS | ID: lil-627394

ABSTRACT

ANTECEDENTES: Las células pertenecientes a la línea HC11 son estimuladas tanto a proliferar mediante el Factor de Crecimiento Epidérmico, como a diferenciar estimuladas con dexametasona, insulina y prolactina, dando origen a los tipos celulares HC11 GM y HC11 IM, respectivamente. De igual manera cuando ellas son transfectadas con el oncogén ras generan Q6 GM y Q6 IM, células transformadas. Producto de ambos mecanismos estas células asumen distintas propiedades modificando tanto sus componentes como sus funciones, los cuales pueden ser cuantificados mediante técnicas morfométricas. OBJETIVO: Evidenciar en términos cuantitativos y morfológicos las variaciones experimentadas tanto por los núcleos como los citoplasmas y su correspondiente relación núcleo-citoplasmática (N/C) pertenecientes a células mamarias de la línea HC11 con el decorrer de los mecanismos de diferenciación y de transformación celular. MÉTODO: Se estudió a nivel de microscopia electrónica de transmisión los tipos celulares en proceso de diferenciación y transformación, cuantificando variaciones de la relación núcleo-citoplasmática y su respectiva funcionalidad. RESULTADOS: Se evidencian diferencias estadísticamente significativas referentes a las áreas nucleares y citoplasmáticas pertenecientes a estos tipos celulares. CONCLUSIÓN: Las células del epitelio mamario en proceso de diferenciación como de transformación, presentan diferentes valores en su relación N/C hecho que responde a funcionalidades específicas en cada tipo celular.


BACKGROUND: Cells of the HC11 line are stimulated to proliferate using the Epidermic Growth Factor, and to differentiate with dexamethasone, insulin and prolactin, giving rise to cell types HC11 GM and HC11 IM, respectively. Likewise when they are transfected with the ras oncogen they generate Q6 GM and Q6 IM transformed cells. As a result of these two mechanisms, these cells assume different properties, in which both their components and their functions are modified. The modifications can be quantified by morphometric techniques. OBJECTIVE: To show in quantitative and morphological terms the variations effected in both the nuclei and the cytoplasms, and the corresponding nuclear-cytoplasmic ratio of mammary cells of the HC11 line, under the effects of cellular differentiation and transformation mechanisms. METHOD: The cell types undergoing differentiation and transformation processes were studied by transmission electron microscope, permitting quantification of variations in the nuclear-cytoplasmic ratio and its relation with the respective functions. RESULTS: Statistically significant differences were found in the nuclear and cytoplasmic areas of these cell types. CONCLUSION: cells of the mammary epithelium undergoing differentiation and transformation processes present different values for their nuclear-cytoplasmic ratio, and this responds specific functions in each cell-type.


Subject(s)
Humans , Female , Breast/cytology , Cell Differentiation , Epithelial Cells/cytology , Breast/metabolism , Breast/ultrastructure , Microscopy, Electron, Scanning Transmission , Cytoplasm , Mammary Glands, Human/cytology , Cell Proliferation
3.
Rev. chil. obstet. ginecol ; 75(2): 107-111, 2010. ilus, graf, tab
Article in Spanish | LILACS | ID: lil-565385

ABSTRACT

Antecedentes: El proceso biológico de diferenciación celular es la traducción de múltiples procesos nucleares y citoplasmáticos que determinan cambios complejos y fundamentales en la ultraestructura, bioquímica y fsiología celular, los cuales pueden ser cuantifcados mediante técnicas morfométricas. Objetivo: Evidenciar en términos cuantitativos y morfológicos las variaciones experimentadas por los nucleolos pertenecientes a células mamarias de la línea HC11 tanto normales como en mecanismo de diferenciación. Método: Se estudió a nivel de la microscopía electrónica de transmisión los tipos celulares en etapa de proliferación (HC11 GM) en comparación con células en estadio de diferenciación (HC11 IM), cuantifcando las variaciones de los nucleolos y su relación con estructuras involucradas en síntesis proteica. Resultados: Se evidencian diferencias estadísticamente signifcativas referentes al área, volumen y longitud entre los nucleolos pertenecientes al tipo celular normal-proliferante y el que se encuentra en proceso de diferenciación. Conclusión: Las células mamarias en proceso de diferenciación presentan una notable disminución de sus nucleolos, y sus ribonucleoproteínas constitutivas generarán básicamente ribosomas adheridos al retículo endoplasmático rugoso, sintetizando proteínas de exportación.


Background: The biological process of cell differentiation is the traslation of multiple nuclear and cytoplas-mic processes that determine complex and fundamental changes in ultrastructure, biochemistry and cell physiology, which can be quantifed using morphometric techniques. Objective: To show in quantitative and morphological terms changes experienced by the nucleolus belonging to HC11 line mammary cells both, in proliferating and differentiation process. Methods: A study at the level of transmission electron microscopy of cell types in stage of cell proliferation in comparison with stage of differentiation was designed to quantify variations of nucleolus and their relation to structures involved in protein synthesis. Results: Marked differences in the area, volume and length of the nucleolus were found between normal-proliferating cell types and those in mechanism of differentiation. Conclusion: The mammary cells in differentiation process show a dramatic decline in its nucleoli and their ribonucleoproteins generate basically ribosomes attached at endo-plasmic reticulum, synthesizing export proteins.


Subject(s)
Humans , Epithelial Cells/ultrastructure , Cell Differentiation/physiology , Mammary Glands, Human/ultrastructure , Cell Nucleolus/ultrastructure , Mammary Glands, Human/cytology , Microscopy, Electron , Cell Proliferation
4.
Rev. chil. obstet. ginecol ; 74(2): 83-87, 2009. ilus
Article in Spanish | LILACS | ID: lil-627370

ABSTRACT

ANTECEDENTES: Transformación celular es el mecanismo resultante de la potente acción generada por onco-genes transformantes sobre una célula normal, los cuales con la consiguiente expresión de oncoproteínas determinan drásticos cambios tanto en la morfología como en los volúmenes de los componentes celulares, generando una célula con diferente funcionalidad. OBJETIVO: Precisar las modificaciones que caracterizan al mecanismo transformante en células de epitelio mamario transfectado con el oncogén ras (HC1 Iras) en comparación con su tipo celular normal (HC11GM). MÉTODO: Se estudió con microscopía electrónica de transmisión aplicando técnicas morfométricas a estos tipos celulares con énfasis en los lisosomas, cuantificando variaciones del organelo responsable de la digestión celular. RESULTADOS: Todos los parámetros lisosomales evaluados en el tipo celular transformado presentan diferencias significativas con respecto a la célula normal. CONCLUSIÓN: Las drásticas modificaciones experimentadas por los lisosomas se reflejan en la adquisición de nuevas funcionalidades en la célula transformada.


BACKGROUND: Cellular transformation is the result mechanism of powerful action generated by transforming oncogene over a normal cell, which with the subsequent oncoprotein expression leads to drastic changes in morphology as well as in cell components volumes, generating a cell with a different function. OBJECTIVE: To specify the modifications that characterizes the transforming mechanism in mammary epithelial cells transfected with the ras oncogene comparing them with its normal cell type. METHOD: Transmission electronic microscopy using morphometric techniques was applied to this cell types, emphasizing lysosomes variations, trying to clarify its role in each cell type metabolism. RESULTS: Everyone lysosomal parameters examined in transformed cell type present significant differences regarding to the normal cells. CONCLUSION: The drastic changes in lysosomes reflected in the acquisition of new energy requirements and metabolism in the transformed cell.


Subject(s)
Humans , Female , Breast/cytology , Cell Transformation, Neoplastic , Lysosomes/metabolism , Transfection , Biomarkers , Genes, ras , Mammary Glands, Human/cytology , Microscopy, Electron, Transmission , Cell Proliferation , Epithelial Cells , Lysosomes/ultrastructure
5.
Washington; American Registry of Pathology; 2009. 418 p. (AFIP Atlas of Tumor Pathology, 10, 4).
Monography in English | LILACS | ID: biblio-870633
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