Expressão imunoistoquímica da cicloxigenase-2 (Cox2) e quantificação das regiões organizadoras de nucléolos (NORs) nos diferentes padrões histológicos do osteossarcoma canino

• Autor(a) principal: Bersano, Paulo Ricardo de Oliveira
• Data de Publicação: 2006
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5208
• topic: Osteossarcoma canino; Cicloxigenase-2; Regiões organizadoras de nucléolos; Canine osteosarcoma; Cyclo-oxygenase 2; Nucleolus organizing region; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA::PATOLOGIA ANIMAL

The purpose of this study was to assess the intensity of the cyclo-oxygenase 2 (Cox2), as well as the nucleolus organizing regions impregnated with silver (AgNORs) and mitosis figures in different canine oteosarcomas. The material used for the analysis was obtained from a retrospective study of approximately 10 years, of canine oteosarcomas recorded in the clinics routine at Federal University of Viçosa and at Federal University of Minas Gerais. The 78 cases of osteosarcomas recorded were histologically analysed and 6 cases of each group were classified as being osteoblastics, condroblastics, fibroblastics and combined cases. This material was submitted to both histochemistry and immunohistochemistry evaluation. Telangiectatic giant cell type and poorly differentiated osteosarcomas were not evaluated due to the small number of observed cases. The results presented statistical differences (p<0,05) for the Cox2 expressions and for the AgNORs proteins among the different osteosarcomas, however no difference was found for the mitosis figures counting. Considering all the evaluations, the osteoblastic osteosarcoma recorded in 53 % of the cases, presented the highest number of NORs and mitosis figures by field, and also it showed the highest number of positive cases with the higher immunomarked cells counting. The results suggest that the osteoblastic osteosarcoma is more aggressive than the other kinds of osteosarcoma evaluated in this study, but because of the lack of both information and standardized clinics data, it is not possible at this point, to connect these findings with the over life and tumor development, and not even to correlate the agressivity of the different kinds of canine osteosarcomas.