ESAV - DZERV - Documentos de congressos (comunicações, posters, actas)
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- Involucrin and filaggrin expression in normal dog skin and different epidermal hyperplasiasPublication . Vala, Helena; Fondevila, D.; Ferrer, L.
- Cattle neoplasias on São Miguel Island - AzoresPublication . Pinto, C.; Medeiros, F.; Alves, A.; Pires, M.; Rodrigues, P.; Seixas, F.; Vala, Helena; Durão, F.; Peleteiro, C.; Peña, L.; Sánchez, B
- A case of multicentric undifferentiated bronchioloalveolar adenocarcinoma in an autochthonous cowPublication . Alves, A.; Pinto, M.; Ribeiro, P.; Vala, Helena
- A case of AngiokeratomaPublication . Vala, Helena; Esteves, F.; Alves, A.A sample of skin from a male eight years old boxer was submitted to the pathology service. This sample included a small, ovoid, well-circunscribed mass that was elevated above the skin surface, had a blue color and 1 cm in diametre. This nodule was removed from the left anterior member of the dog. No others nodules have been reported until the moment. The samples were embedded in paraffin, sectioned at 3 m and stained with a hematoxylin and eosin (HE). For the immunohistochemical study a commercial monoclonal antibody directed against keratin, a commercial monoclonal antibody against vimentin, a commercial polyclonal antibody against type IV collagen and a commercial polyclonal antibody against factor VIII- related antigene were used. This sections were treated with a avidin biotin complex. The microscopic examination revealed an irregular hyperplasia of the epidermis. The superficial dermis was composed by dilated vascular spaces filled with erytrocites. Each vascular structure was enclosed and lined by a single layer of cells which resembled normal endothelial cells, aligned on a thin collagenous septa. Epithelial trabeculae extended downward to separate and partially surround some of the vascular structures. Immunohistochemically, as expected, the epitelial component revealed reactivity for keratin and the vascular proliferations revealed reactivity to vimentin, type IV collagen and the endothelial cells revealed reactivity to factor VIII- related antigene. The histologic characteristics were similar to those of the hemangiomas but the presence of this unusual marked hyperplasia of the overlying epidermis, which appeared to invade among the vascular spaces of the superficial dermis, showed that an angiokeratoma was present. To conclude, the mass observed had both components, vascular and epithelial, which permitted us to conclude that we were in the presence of the rare subtype of hemangioma - the angiokeratoma.
- Expresión de una citoqueratina de amplio espectro en piel y mucosas de ovejaPublication . Vala, Helena; Fondevila, D.; Ferrer, L.
- Marcadores de diferenciação epitelial/epidérmica em mucosas de suínosPublication . Vala, Helena; Fondevila, D.; Ferrer, L.Existem dificuldades em obter bons modelos, sejam culturas in vitro, sejam modelos animais, para realizar estudos sobre os efeitos de certos químicos na proliferação, diferenciação e citotoxicidade da mucosa oral humana. Há estudos de permeabilidade oral que revelaram grandes semelhanças entre a mucosa oral de humanos e suínos. Neste estudo descrevemos a expressão de um anticorpo anti-citoqueratinas de epitélios menos diferenciados (MNF1 16) e outro de epitélios diferenciados (LP34), de dois marcadores de diferenciação epidérmica, involucrina e profilagrina, e de um marcador característico do epitélio oral, calgranulina (MAC 387). Obtiveram-se amostras de duas transições mucocutâneas e respectivas mucosas de cinco exemplares da espécie suína. As amostras foram processadas seguindo a técnica histológica de rotina e a técnica de imunohistoquímica foi a de Avidina-Biotina-Peroxidase. Nas mucosas de suínos estudadas o melhor marcador foi o anticorpo policlonal MAC 387. O anticorpo anti-involucrina humana apresentou reactividade na mucosa oral de suínos mas não na mucosa nasal, enquanto o anticorpo anti-citoqueratina humana MNF 116 se expressou na mucosa nasal de suínos mas não na mucosa oral. Os anticorpos anti-citoqueratina humana M717 e anti-profilagrina humana não apresentaram reactividade nas mucosas estudadas. Tais resultados demonstraram que as duas mucosas apresentam um padrão de diferenciação celular diferente do da epiderme suína, diferente entre si e diferente do descrito nas mucosas humanas correspondentes
- Expresión filagrina en piel de ovejaPublication . Vala, Helena; Fondevila, D.; Ferrer, L.
- Estudio inmunohistoquimico de diferenciación de los carcinomas de células escamosas bovinosPublication . Vala, Helena; Fondevila, D.; Carvalho, T.; Pinto, C.; Peleteiro, C.; Pinho, M.; Ferrer, L.En el ganado bovino son frecuentes los carcinomas de células escamosas localizados en párpados y tercer párpado. En Portugal, este tumor se diagnostica con frecuencia en bovinos de las Azores, representa un 21% del total de neoplasias diagnosticadas en esta especie, la segunda después de los tumores de la vejiga de la orina. El objetivo de este trabajo ha sido conocer el origen y grado de diferenciación de estas neoplasias utilizando anticuerpos contra queratinas expresadas en keratinocitos basales y suprabasales, y anticuerpos considerados marcadores de diferenciación terminal como la involucrina y profilagrina.
- Immunohistochemistry studies on bovine squamous cell carcinoma morphological characterization of epidermal cell proliferation and differentiation markers and characterization of cytokeratinsPublication . Vala, Helena; Fondevila, D.; Carvalho, T.; Pinto, C.; Peleteiro, C.; Pinho, M.; Ferrer, L.Bovine Ocular Squamous Cell Carcinoma (OSCC) is a general designation for a group of primary neoplasias of keratinocytes arising from ocular tissues, especially the lids and particularly the third eye lid. OSCC has been diagnosed all over the world with high prevalence, being the most common bovine tumour and the one causing the most significant economic losses (Hamir & Parry, 1980; Dennis et al., 1985, Heeney & Valli, 1985; Wilcock, 1993). In Portugal, the frequency of these tumours is particularly high in the Azores, where in S. Miguel Island a large number of cattle affected with OSCC is rejected for consumption at slaughter. OSCC is the second most frequent neoplasia after urinary bladder tumours, representing 21% of all cases of rejection due to neoplasia (Pinto et al, 1996). Several reasons have been advanced to explain this situation namely the fact that animals stay in pasture all year around, with a prolonged exposition to day light and benefiting from few shelters. The ingestion of toxic plants present the pasture could also give rise to photosensitazation problems, either primary or due to hepatic toxicity, that could generate predisposing conditions to the development of OSCC.
- Estudio immunohistoquímico de tumores de folículos pilosos caninosPublication . Mozos, E.; Zafra, R.; Fondevila, D.; Vala, Helena; Martín, M. P.; Pérez, J.El objetivo de este trabajo ha sido analizar los patrones de expresión de varias citoqueratinas e involucrina en tumores del folículo piloso canino con especial interés en los que exhiben menor diferenciación tricofítica. En el estudio se han utilizado 71 tumores foliculares diagnosticados en el Servicio de Diagnóstico de Histología y Anatomía Patológica Comparadas de la UCO. Las muestras, fijadas en formol al 10%, se procesaron de la forma habitual para diagnóstico histopatológico y se utilizó la técnica ABC para el estudio inmunohistoquímico. Los tumores foliculares se clasificaron histopatológicamente según Golsmidht y cols, (1998) como tricoepiteliomas (22), epiteliomas intracutáneos cornificantes (23) y tricoblastomas (5)y pilomatricomas (21).