Navegando por Assunto "histopatologia"

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    Graduação histológica e expressão de metaloproteinases (MMP-9 e MMP-2) e seus inibidores (TIMP-1 e TIMP-2) na glândula mamária canina neoplásica
    (Universidade Federal de Goiás, 2012-08-03) FERREIRA, Hugo Henrique; MORENO, Juan Carlos Duque; http://lattes.cnpq.br/8509640024284103; NARDI, Andrigo Barboza de; http://lattes.cnpq.br/5256503293611165; MOURA, Veridiana Maria Brianezi Dignani de; http://lattes.cnpq.br/8773201078957745
    In bitchs, mammary glands are the most common sites for the occurrence of neoplasms. To evaluate the biological behavior of these lesions is routinely employ descriptive histological methods that, combined with histological grading, help predict prognosis of these diseases. The imbalance between the amount of tissue matrix metalloproteinases (MMPs), proteolytic enzymes involved in physiological and pathological processes, and their inhibitors (TIMP), plays an important role in development and tumor invasion. To evaluate the biological behavior of some common types of breast tumor bitches this research was divided in two steps. The first one was correlating histological classification and degree of mammary neoplasms in bitches, and to correlating the degree of malignancy and tumor size. For this, 119 samples were evaluated in canine mammary tumors, all tumors were considered disorders of the growth of canine mammary gland, including neoplastic (benign and malignant) and non-neoplastic (hyperplastic changes). All tumors were classified and only the malignant were graded histologically and correlated with tumor size. It was concluded that the complex carcinoma is the most common cancer histological type and which has the lowest histological grade compared to other malignant tumor types. Further, neoplasms larger than five centimeters were predominantly malignant (92,3% or 12/13) and no correlation was observed between tumor size and histologic grade. The relation between histological classification and graduation helped in microscopic description of malignant mammary tumors in bitches. The second step was to evaluate the expression of MMP-9, MMP-2 TIMP-1 and TIMP-2 in normal and neoplastic canine mammary tissue. For this purpose it was selected 48 samples of canine mammary tissue, 14 complex carcinomas (CC), 13 tubulopapillary carcinoma (TC), six simple mammary adenoma (MA) and 15 normal breast (MN), and submitted to technical immunohistochemistry for the evaluation of the intensity staining and the number of epithelial and stromal cells selected. Differences were observed in the expression of MMP-9 and TIMP-1 and TIMP-2 according to the mammary histomorphology. The MMP-9 showed higher expression in epithelial and stromal cells of the CC and CT compared to MN. It was found a lower expression of TIMP-1 in stromal cells of the CC and overexpression of TIMP-2 in epithelial cells of the CT. Also a positive correlation between MMP-9 and TIMP-1 and the intensity staining and number of epithelial and stromal cells marked in MN and between MMP-9 and TIMP-2 on TC neoplastic epithelial cells. It was concluded that there is variation between expression of MMP-9, TIMP-1 and TIMP-2 among the tumor types, and a positive correlation between TIMP-1 and MMP-9 in normal mammary gland and between MMP-9 and TIMP-2 in tubulopapilar carcinoma. The balanced expression of MMP-9, MMP-2, TIMP-1 and TIMP-2 is essential for the homeostasis of canine normal mammary gland, while the overexpression of MMP-9 and TIMP-2, and the reduced expression of TIMP-1 in carcinomas represents an appropriate condition to the tumor development.
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    Biomarcadores comportamentais, histopatológicos e proteômicos da toxicidade aguda da formulação comercial do herbicida glifosato em poecilia reticulata
    (Universidade Federal de Goiás, 2012-02-29) ROCHA, Thiago Lopes; SABÓIA-MORAIS, Simone Maria Teixeira de; http://lattes.cnpq.br/6723881044959716
    The mechanism of acute toxicity of the commercial formulation glyphosate, Roundup Transorb® (RDT), was investigated in the guppy (Poecilia reticulata) gills using proteomic technologies associated with analyses of histopathological indexes (HI´s), followed by quantification of histopathological lesions of the gills. Additionally, the present study describes a protocol for the analysis of fish behavior using measurements of the Index of morphofunctional behavior (Imb) and Total (Itb). The results indicate that the acute toxicity of RDT may change P. reticulata behavior as a consequence of changes in the expression of proteins associated with cyto-histopathological lesions of the gills. RDT LC50,96h for guppy females was 7.54 ± 0.93 μL.L-1, indicating that the species is moderately sensitive to this herbicide. Acute exposure to RDT sublethal concentration of 3.8 μL.L-1 induced time-dependent histopathological lesions of the gills in different epithelial and muscle cell types. HI´s were related to increase in severity and frequency of histopathological lesions and suggest that RDT may cause regressive, circulatory, and progressive disorders in the guppy gills. Two-dimensional electrophoresis associated with mass spectrometry and biocomputing permitted to verify 48 spots of proteins/isoforms regulated by RDT, which are involved in different cell processes, such as energy metabolism, regulation and maintenance of cytoskeleton, metabolism of nucleic acids and proteins in response to stress. The study of behavior biomarkers (BM´s) indicates that Imb and Itb were viable in the analysis of P. reticulata behavioral changes induced by RDT. Furthermore, proteomic and histological changes in the gills of P. reticulata induced by RDT may be histopathological and proteomic BM´s to biomonitor water pollution caused by glyphosate-based herbicides.