Analisamos a expressão de IL-10, IFN-<font face=\"symbol\">g e, seus receptores pelas células trofoblásticas de camundongos, citocinas anti e pró-inflamatórias. Cones ectoplacentários aos 7,5 dias de gestação foram cultivados por 48 h e em seguida tratados com 100 U/mL IFN-<font face=\"symbol\">g ou 10 <font face=\"symbol\">hg/mL IL-10. Após 6 h e 14 h, as amostras foram processadas para análise da expressão gênica por RT-PCR e protéica por imunohistoquímica, respectivamente. Grupos controle não receberam tratamento. IFN-<font face=\"symbol\">g aumentou a expressão de IL-10R1 mas não a de IL-10 nas células trofoblásticas. IL-10, ao contrário, aumentou a expressão de IFN-<font face=\"symbol\">g, mas diminuiu IFN-<font face=\"symbol\">gR<font face=\"symbol\">a e não alterou IFN-<font face=\"symbol\">gR<font face=\"symbol\">b. Reações imunohistoquímicas confirmaram os resultados de expressão gênica. Isto sugere que o trofoblasto pode participar da imunidade da interface materno-placentária aumentando a expressão de IFN-<font face=\"symbol\">g em situações em que no meio há aumento de citocinas anti-inflamatórias, o que deve ser o reflexo da necessidade e importância desta citocina para o sucesso da gestação. / Key cytokines such as IL-10 and IFN-<font face=\"symbol\">g, essential for immune response regulation, have also been found locally at maternal-placental interface during mouse pregnancy. Particularly, levels of IL-10 characterize an anti-inflammatory environment associated to the inhibition of T helper-1 lymphocytes (Th1) development and the proliferative stimulation of the B lymphocytes (humoral response). On the other hand, increases in IFN-<font face=\"symbol\">g profile prevent T helper-2 lymphocytes (Th2) activation leading to an inflammatory response that favors a Th1 response. The local production of these cytokines by NK uterine cells and T gd lymphocytes are relevant, but not exclusive. Thus, this study analyzed the potential contribution of the trophoblast in the maintenance of Th1/Th2 balance in the maternal-placental interface, represented, respectively by the expression of IL-10 and IFN-<font face=\"symbol\">g cytokines. The expression of the anti-inflammatory cytokine IL-10 and its receptor was evaluated in the presence of an inflammatory environment mimetized by IFN-<font face=\"symbol\">g addition to the culture medium. On contrary, the expression of the IFN-<font face=\"symbol\">g (and its receptor) was evaluated in the presence of IL-10 characterizing an anti-inflammatory condition. Mouse trophoblast cells were isolated from implantation sites at gestational day 7.5 and cultured in standard conditions. Gene and protein expression were determined by immunohistochemistry and RT-PCR. IL-10 and IFN-<font face=\"symbol\">g and their receptors were expressed in cultured trophoblast cells in the absence or presence of IFN-<font face=\"symbol\">g and IL-10, respectively. IFN-<font face=\"symbol\">g treatment increased IL-10R1 expression but do not alter IL-10 expression. On contrary, in the presence of IL-10 the IFN-<font face=\"symbol\">g expression increased significantly while the expression of its receptor decreased. These results suggest that a proinflammatory environment increases trophoblast responsiveness to IL-10 whereas an anti-inflammatory condition seems to reinforce the importance of IFN-<font face=\"symbol\">g expression at the maternal-placental interface, on the initial periods of gestation.
| Identifer | oai:union.ndltd.org:usp.br/oai:teses.usp.br:tde-03062008-110226 |
| Date | 09 April 2008 |
| Creators | Ferreira, Márcio José |
| Contributors | Bevilacqua, Estela Maris Andrade Forell |
| Publisher | Biblioteca Digitais de Teses e Dissertações da USP |
| Source Sets | Universidade de São Paulo |
| Language | Portuguese |
| Detected Language | English |
| Type | Dissertação de Mestrado |
| Format | application/pdf |
| Rights | Liberar o conteúdo para acesso público. |
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