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- W1982804782 abstract "The purpose of the present study was to determine the effects of human recombinant transforming growth factor-beta 1 (TGF-beta 1) on the proliferation of normal cell and cancer cell lines and to evaluate the mechanism of TGF-beta-induced immunosuppression. Murine H238 fibrosarcoma and human UC-11 glioblastoma cells showed no proliferative change in the presence of TGF-beta, whereas the growth of human LS174T colon adenocarcinoma cells was significantly enhanced at the lower concentrations of TGF-beta. In contrast, Mono/Mac-6, a human monocyte cell line, human peripheral blood mononuclear (PBMN) cells, and BALB/c mouse spleen cells were significantly suppressed by 2.5 to 250 ng/ml of TGF-beta. In order to investigate the mode of action, TGF-beta and other cytokines were added 0, 1, and 2 days after initiation of the culture. Mono/Mac-6 cells showed that 2 days are needed for TGF-beta-induced suppression. Simultaneous addition of TGF-beta and tumor necrosis-alpha (TNF-alpha; 600 units/ml) to Mono/Mac-6 cells resulted in nearly complete suppression by day 3. IL-2, and to a lesser extent IL-4, was able to counteract the suppressive effects of TGF-beta on mitogen-stimulated spleen cells. However, our results indicate that IL-2 is not as effective in restoring responsiveness once T cell activation is well underway. IL-1 and interferon-gamma had no effects on TGF-beta-mediated immunosuppression. Since TGF-beta depressed normal cell growth and since IL-2 could effectively counteract the suppression, we assayed for IL-2 production. When normal spleen cells were treated with 2.5 ng of TGF-beta/ml, a 3.4-fold decrease in IL-2 production was observed. This is a potential mechanism for TGF-beta-mediated immunosuppression." @default.
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- W1982804782 date "1993-01-01" @default.
- W1982804782 modified "2023-10-09" @default.
- W1982804782 title "Modulation of Transforming Growth Factor-β1 Effects by Cytokines" @default.
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- W1982804782 doi "https://doi.org/10.3109/08820139309063416" @default.
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