| Autor: |
De Moraes, M. D. C. Leite, Minoprio, P., Dy, M., Dardenne, M., Savino, W., Hontebeyrie-Joskowicz, M. |
| Předmět: |
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| Zdroj: |
Scandinavian Journal of Immunology; Jan1994, Vol. 39 Issue 1, p51-58, 8p, 2 Charts, 6 Graphs |
| Abstrakt: |
Thymocytes from mice with experimental Trypanosoma cruzi infection respond poorly to Con-A stimulation. However, the proliferative capacity of these cells is not impaired, as demonstrated by the fact that at high doses, exogenous rIL-2 restores thymidine uptake. This finding could be explained either by insufficient IL-2 production or by the appearance of inhibitory factors during T. cruzi infection. This paper shows that in response to Con A, IL-2 production is decreased in the model. Furthermore, the whole profile of cytokine production is modified, with a striking increase in IL-10, IFN-γ, IL-4, IL-5 and IL-6 production. The results indicate that IL-10 plus IFN-γ are responsible for the decrease in the Con A-induced proliferation since a normal proliferative response as well as normal IL-2 production can be restored if both cytokines are neutralized by adding their monoclonal antibodies (MoAbs). Evidence is provided also for an enhanced non-specific cytotoxicity of thymic cells from infected mice that might involve IL-4, IL-5 and IL-6. This is the first study demonstrating an alteration of thymic cell function by T. cruzi infection which results from overstimulation of IL-10 and IFN-γ production. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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