656 resultados para Camundongos


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Antibody fluorescent tests were carried out with serum and blood eluates from mice inoculated with different doses of irradiated (90 krad) and non irradiated T. cruzi culture forms. Non irradiated culture forms were more efficient immunogens than the irradiated ones. About 75% of the animals inoculated with non irradiated forms showed titers equal or higher than 1/16, the highest one reaching 1/64.

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Mice foetus were killed between 13 and 16 days of the gestational period and their molar tooth germs grafted into the anterior chamber of the eye. The hosts were injected either with 6.25 mg/Kg or with 125 mg/Kg of cyclophosphamide and killed 15 days later. The cyclophosphamide irreversibly, interferes on tooth germ development causing either its total degeneration or an alteration on its morphology forming hypodeveloped tooth germs; its action is directly proportional to the foetus age and to the dose used; it does not induce the formation of osteodentin while some predentin partial cell inclusion may occur.

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In order to analyze the reorganization of the condylar process after unilateral condylectomy in animals which have received AZT, 30 albino mice, 30 days old were used. The condylectomized animals were divided in two groups, one have received distilled water and the other AZT, orally during 10 days. After 5, 10, 15, 30 and 45 days of the surgery the animals of both groups were sacrificed, their heads removed and fixed in 10% formalin. After decalcification the pieces received histological routine treatment to be included in paraffin. The slices were stained by hematoxylin/eosin method. The analysis of results showed that: 1. the condylar repair is similar on both groups; 2. the results reaffirm those found in the literature, that the articulation after condylectomy is located in an anterior position and that the articular disc is not a determinant factor on condylar reorganization.

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O objetivo do presente estudo foi comparar a produção de IFN-γ, IL-12 e IL-4 entre camundongos jovens (5, 12 e 19 dias de idade) e adultos (30 dias de idade). As avaliações foram feitas por estimulação, in vitro, de células esplênicas com Concanavalina A (ConA) , Staphylococcus aureus (S. aureus) e lipopolissacarídeo (LPS). Diferentes concentrações de cada estímulo foram testadas e os sobrenadantes das culturas foram coletados após 48 horas de incubação e as concentrações de IFN-γ, IL-12 e IL-4 determinadas por ELISA. Células de camundongos jovens e adultos produziram níveis igualmente elevados de IFN-γ após estímulo com ConA. Somente animais adultos produziram IFN-γ em resposta ao estímulo com S. aureus. Em culturas estimuladas com LPS, a produção desta citocina foi baixa e similar nos animais jovens e significativamente elevada nos animais adultos. Somente células de animais adultos estimuladas com S. aureus foram capazes de produzir IL-12. O único estímulo capaz de induzir níveis detectáveis de IL-4 foi ConA, sendo que estes níveis foram mais elevados nos animais com 12 e 19 dias de idade em comparação com animais neonatos e adultos. A diminuição das doses ótimas dos estímulos não mudou o perfil de produção de cada citocina nos animais jovens. Estes resultados permitem concluir que a idade afeta a produção de citocinas: ocorre maior produção de IL-4 em camundongos jovens e maior produção de IL-12 e IFN-γ em animais adultos. Estas informações são importantes devido ao papel destas citocinas na polarização das respostas imunes nos sentidos Th1 e Th2. Palavras-chave: camundongo; citocina; interferon-gama; interleucina-4; interleucina-12.

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Baccharis coridifolia is one of the most important poisonous plants to cattle in the South of Brazil. The plant provokes necrotic lesions in the lymphoid tissues and in the gastrointestinal tract of cattle. Experimental administration to mice produces most of the lesions seen in the lymphoid tissues of cattle. This study was conducted to search possible differences in the susceptibility of T and B lymphocyte subpopulations. Lymph nodes, spleen, thymus and gut-associated lymphoid tissue (GALT) of cattle and mice experimentally poisoned were evaluated. The results were evaluated based on cell populations affected or remaining in the organs. Immunostaining for B lymphocytes (anti-BLA-36) identified the germinal center of follicles of the lymph node, spleen and GALT in both species. Immunostaining for T lymphocyte (anti-CD3) identified the paracortical area of the germinal centers of the lymph nodes and GALT, the periarteriolar area of the spleen, and the whole thymus both in cattle and mice. Experimentally poisoned cattle and mice shows necrosis of the germinal center of secondary follicles of the lymph nodes, spleen and GALT, where necrotic cells were immunostained for B and less often for T lymphocyte. Necrotic cells in the paracortical region of the lymph node were less often and were immunostained. Necrotic lesions of the thymus were seen only in mice, with positively stained for T lymphocyte. The distribution of the lesions in the lymphoid tissues and the immunostaining in necrotic cells suggested that the active principles of the plant are cytotoxic to B and T cells.

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Pós-graduação em Biologia Geral e Aplicada - IBB

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)