Lesões do músculo gastrocnêmio e da junção músculo tendínea em cães afetados pela distrofia muscular progressiva
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Data
2011-02-17
Autores
Beretta, Daniel Côrtes [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A Distrofia Muscular no Golden Retriever (DMGR) é doença muscular degenerativa hereditária que representa excelente modelo para o estudo da Distrofia Muscular de Duchene de humanos. Esta pesquisa objetivou estudar as lesões do músculo gastrocnêmio (MG) e da junção músculo tendínea (JMT), na ausência de distrofina em cães afetados por distrofia muscular. Foram utilizados seis cães distróficos para distrofia muscular e três cães controle que vieram a óbito por causas variadas que não afetavam o sistema músculo esquelético. Após necrópsia completa, setenta e cinco fragmentos musculares do MG e da JMT foram colhidos em duplicata. Metade destes foi fixada em solução de formol e o restante foi congelado em nitrogênio líquido. Seguiram-se as técnicas usuais para inclusão em parafina e coloração pelo método Picrosirius, HE e TGM para análise histopatológica. Reações imuno-histoquímicas para MHCII e vimentina foram realizadas nos cortes em parafina. Os fragmentos congelados foram processados para colorações especiais para cálcio, alizarina Red S; reações enzimo-histoquímicas de fibras do tipo I (FTI) e II (FTII), mATPase (pH 9,4); e imuno-histoquímicas para CD4, CD8, MHCI e utrofina. Resultados da análise histopatológica mostraram que as lesões no MG de distróficos foram mais pronunciadas que na JMT. A análise histomorfométrica no MG de distróficos revelou maior porcentagem de FTII e menores valores de diâmetro mínimo e área para FTI e FTII. Para os parâmetros supracitados, as FTII na JMT mantiveram-se morfologicamente iguais ao controle. Não houve diferença quanto ao tipo de colágeno na JMT de distróficos e controle. Nas reações imuno-histoquímica para os anticorpos CD4, CD8, MHCI, MHCII, vimentina e utrofina, somente o antígeno MHCI apresentou diferença significativa (p< 0.07), quando comparado ao controle, sendo a imunoexpressão mais...
The Muscular Dystrophy in Golden Retrievers (DMGR) is a hereditary degenerative muscle disease that represents an excellent model for the study of Duchenne Muscular Dystrophy. The aim of this study was to characterize the lesions in gastrocnemius muscle (GM) and myotendinous junction (MTJ) in absence of dystrophin in dogs affected by progressive muscular dystrophy. Six affected dogs and three control dogs, without musculoskeletal system diseases, were used. After necropsy, seventy-five myotendinous and muscle samples were cut and collected in duplicate. Half of them were fixed in formalin solution, and the other half were frozen in liquid nitrogen. After that, the samples were processed by usual techniques of paraffin embedding and stained by Picrosirius method, HE and TGM, for histopathological analysis. Immunohistochemical reactions for MHCII and vimentin were performed in paraffin samples. The frozen fragments were processed for special stains for calcium, Alizarin Red S, enzymohistochemical reactions of type I fibers (FTI) and II (FTII), mATPase (pH 9.4), and immunohistochemical for CD4, CD8, MHCI and utrophin. The results of histopathological analysis of the dystrophic dogs showed that the lesions in GM were more pronounced than MTJ. Histomorphometric analysis of the dystrophic GM showed the highest percentage of FTII, and lower values of minimum diameter and area for FTI and FTII. For the same parameters, the FTII in dystrophic MTJ remained morphologically similar to control. There was no difference in the type of collagen in MTJ of dystrophic and control. In immunohistochemical reactions to antibodies CD4, CD8, MHCI, MHCII, vimentin and utrophin, only the antigen MHCI showed a significant statistic difference (p <0.07) compared to control, being the most intense immunostaining in GM dystrophic. From these results we can conclude that the preservation of morphological MTJ can be ... (Complete abstract click electronic access below)
The Muscular Dystrophy in Golden Retrievers (DMGR) is a hereditary degenerative muscle disease that represents an excellent model for the study of Duchenne Muscular Dystrophy. The aim of this study was to characterize the lesions in gastrocnemius muscle (GM) and myotendinous junction (MTJ) in absence of dystrophin in dogs affected by progressive muscular dystrophy. Six affected dogs and three control dogs, without musculoskeletal system diseases, were used. After necropsy, seventy-five myotendinous and muscle samples were cut and collected in duplicate. Half of them were fixed in formalin solution, and the other half were frozen in liquid nitrogen. After that, the samples were processed by usual techniques of paraffin embedding and stained by Picrosirius method, HE and TGM, for histopathological analysis. Immunohistochemical reactions for MHCII and vimentin were performed in paraffin samples. The frozen fragments were processed for special stains for calcium, Alizarin Red S, enzymohistochemical reactions of type I fibers (FTI) and II (FTII), mATPase (pH 9.4), and immunohistochemical for CD4, CD8, MHCI and utrophin. The results of histopathological analysis of the dystrophic dogs showed that the lesions in GM were more pronounced than MTJ. Histomorphometric analysis of the dystrophic GM showed the highest percentage of FTII, and lower values of minimum diameter and area for FTI and FTII. For the same parameters, the FTII in dystrophic MTJ remained morphologically similar to control. There was no difference in the type of collagen in MTJ of dystrophic and control. In immunohistochemical reactions to antibodies CD4, CD8, MHCI, MHCII, vimentin and utrophin, only the antigen MHCI showed a significant statistic difference (p <0.07) compared to control, being the most intense immunostaining in GM dystrophic. From these results we can conclude that the preservation of morphological MTJ can be ... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Cão, Imuno-histoquímica, Distrofia muscular, Junção músculo tendínea, Músculo gastrocnêmio, Dog, Muscular distrophy, Immunohistochemistry, Gastrocnemius muscle, Myotendinous junctions
Como citar
BERETTA, Daniel Côrtes. Lesões do músculo gastrocnêmio e da junção músculo tendínea em cães afetados pela distrofia muscular progressiva. 2011. v, 51 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2011.