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- W2012256912 abstract "In view of the critical role played by bacillus Calmette-Guérin (BCG) in the development and functional activation of protective T cells against tuberculosis, it has become important to understand the mechanisms by which cytokines regulate BCG-mediated immune responses. There is evidence that cytokine-mediated suppression of T cell function by mechanisms, including apoptosis, may reduce host resistance in tuberculosis. However, it is unclear whether cytokine-mediated suppression of antigen-responsive T cells through apoptotic mechanisms may be operating during human cellular activation induced by BCG. Here we present evidence, for the first time, that treatment of BCG-activated T cells with transforming growth factor-beta (TGF-beta) induces cellular apoptosis. These results were further supported by the fact that treatment of cells with a blocking mAb directed to TGF-beta significantly inhibited the percentage of apoptosis induced by TGF-beta. Interestingly, TGF-beta-mediated death of BCG-activated T cells in cultures containing interleukin (IL)-12 was observed. Moreover, our results demonstrated the induction of apoptosis by TGF-beta in BCG-activated T cells cultured in the presence of exogenous IL-12. In addition, our data indicated that TGF-beta significantly inhibited both BCG-induced cell growth determined by thymidine uptake and BCG-induced IFN-gamma secretion. Finally, TGF-beta-induced apoptosis in BCG-activated T cells correlated inversely with BCG-induced IFN-gamma secretion. Taken together, these findings indicate that TGF-beta induces apoptosis in human T cells activated with BCG and at the same time suggest that loss of BCG-reactive T cells through apoptotic mechanisms could contribute to an increased susceptibility to Mycobacterium tuberculosis infection." @default.
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- W2012256912 date "2000-06-01" @default.
- W2012256912 modified "2023-09-25" @default.
- W2012256912 title "Induction of Apoptosis in Bacillus Calmette–Guérin-Activated T Cells by Transforming Growth Factor-β" @default.
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- W2012256912 doi "https://doi.org/10.1006/cimm.2000.1662" @default.
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