Portal de Pesquisa da BVS Veterinária

Jaboticabal,; s.n; 10/10/2013. 61 p.

Tese em Português | VETTESES | ID: vtt-12526

Resumo

As células dendríticas despertam atualmente um grande interesse de estudos, pois são alvos primários da atividade tumoral sobre o sistema imune. O objetivo principal deste estudo foi avaliar a relação entre o infiltrado inflamatório e as células dendríticas (DCs) nos carcinomas mamários do tipo simples em cadelas. Dois grupos de amostras foram formados, o primeiro composto por 18 amostras de tecido mamário sem alterações (grupo controle) e o segundo, de 26 carcinomas mamários do tipo simples (grupo tumor). Além disso, foram analisados 15 linfonodos provenientes das cadelas com tumor de mama e quatro linfonodos oriundos das cadelas sem tumor de mama. Foi realizada a imunodetecção de DCs mieloides imaturas e maduras, DCs plasmocitoides, linfócitos T, macrófagos e moléculas do complexo de histocompatibilidade maior classe II (MHC-II). Foram também identificados os mastócitos pela coloração especial de azul de toluidina. Para os linfonodos, realizou-se apenas a imunodetecção de DCs mieloides imaturas e maduras. A idade média das cadelas com tumor de mama foi de 9,3 anos (30%) e os cães sem raça definida (SRD) foram os mais afetados. Nenhum linfonodo apresentou focos de micrometástases. Das 17 cadelas acompanhadas para o estudo de seguimento, nove estão vivas e oito vieram a óbito. A causa de morte mais ocorrente foi a provocada por metástases (67%). Nas mamas com tumor, observou-se que os mastócitos e as DCs mieloides maduras apareciam nas regiões peritumorais. As DCs mieloides imaturas, as DCs plasmocitoides, os macrófagos e as células imunomarcadas para MHC-II foram visualizados somente no estroma tumoral. Já os linfócitos T foram encontrados nas porções tumoral e peritumoral. Nos linfonodos a marcação das DCs mieloides imaturas concentrou-se nos folículos linfoides e na zona paracortical; já as DCs maduras apareceram somente no centro dos folículos

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Dendritic cells currently represent a big focus of studies, because they?re primary targets of tumor activity on the immune system. The main objective of this study was to evaluate the relationship between the inflammatory infiltrate and dendritic cells (DCs) in mammary carcinomas simple type in female?s dogs. Two groups of mammary gland samples were formed, the first was composed of 18 mammary tissue samples unchanged (control group) and the second, with 26 mammary simple carcinomas (tumor group). In addition, 15 lymph nodes were analyzed from bitches with mammary gland tumor and four lymph nodes derived from bitches without mammary gland tumor. Immunodetection was performed to immature and mature myeloid DCs, plasmacytoid DCs, T cells, macrophages and molecules of the major histocompatibility complex class II (MHC -II). Mast cells have also been identified by the special staining toluidine blue. To lymph nodes, the immunodetection was performed only to immature and mature myeloid DCs. The average age of the bitches with mammary tumor was 9.3 years (30 %) and dogs without breed (SRD) were the most affected. No lymph node showed foci of micrometastases. From 17 bitches monitored for follow-up study, nine are alive and eight died. The cause of death more occurred was caused by metastasis (67%). In the mammary glands with tumor, it was observed that the mast cells and mature myeloid DCs appeared in peritumoral regions. The immature myeloid DCs, plasmacytoid DCs, macrophages and cells immunostained for MHC-II were seen only in the tumor stroma. The T cells were founded into the tumor and in peritumoral areas. Into the lymph nodes, the marking of immature myeloid DCs was concentrated in lymphoid follicles and paracortical zone; the mature DCs appeared only in the center of the lymphoid follicles. In mammary gland control, the number of inflammatory cells as well as DCs was minimal. Statistically

Biblioteca responsável: BR68.1