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|Title:||TGF-beta regulates pathology but not tissue CD8+ T cell dysfunction during experimental Trypanosoma cruzi infection||Authors:||Martin, Diana L.
|Issue Date:||2007||Description:||Infection with the protozoan parasite Trypanosoma cruzi leads to chronic infection, with parasite persistence primarily in muscle tissue. CD8(+) T cells isolated from muscle tissue of T. cruzi-infected mice display decreased production of IFN-gamma in response to T cell receptor engagement. The expression of TGF-beta at the site of CD8(+) T cell dysfunction and parasite persistence suggested that this immunoregulatory cytokine might play a role in these processes. Mice expressing a T cell-specific dominant negative TGF-beta receptor type II (DNRII) were therefore infected with T. cruzi. Infection of DNRII mice resulted in massive CD8(+) T cell proliferation, leading to increased numbers but decreased frequencies of antigen-specific CD8(+) T cells in the spleen compared to wild-type mice. However, TGF-beta unresponsiveness failed to restore effector functions of CD8(+) T cells isolated from muscle tissue. Histological examination of skeletal muscle from T. cruzi-infected DNRII mice revealed an extensive cellular infiltrate, and DNRII mice displayed higher susceptibility to infection. Overall, while TGF-beta does not appear to be responsible for CD8(+) T cell unresponsiveness in peripheral tissue in T. cruzi-infected mice, these data suggest a role for TGF-beta in control of immunopathology in response to T. cruzi infection.||URI:||http://sgc.anlis.gob.ar/handle/123456789/475||Rights:||closedAccess|
|Appears in Collections:||Publicaciones INP|
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|Europeanjournalofimmunology,2007,37(10),2764-2771..pdf||247.27 kB||Adobe PDF|
|Eur.J.Immunol.2007.37,3605 -Correccion.pdf||47 kB||Adobe PDF|
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