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- W2063485460 abstract "There is now good evidence that tumour necrosis factor [TNF] stimulates DNA synthesis of B-chronic lymphocytic leukaemia (B-CLL) cells. The malignant clone produces TNF, and addition of exogenous TNF up-regulates the TNF mRNA in B-CLL cells. Interleukin-6 (rIL-6) may also be important in this growth loop. We studied the interaction of TNF and IL-6 in the regulation of DNA synthesis (3H-TdR uptake), cytokine release and cell survival in CLL cells in vitro. Addition of TNF (100 U/ml over 5 days) enhanced DNA synthesis from 718 +/- 284 (mean cpm +/- SE) to 2730 +/- 545 compared to cells cultured in medium alone (n = 16, p < 0.01). TNF-alpha induced DNA synthesis was inhibited in all cases studied by the addition of anti-TNF monoclonal antibody (5 micrograms/ml) to cell cultures. Spontaneous IL-6 protein release was enhanced in the presence of TNF (100 U/ml and 250 U/ml) by CLL cells at 48 hours of culture 143.6% and 172% (p < 0.05, n = 6). At 120 hours of culture, the increase was 323% and 412.5% (4 of 7 cases) of the control respectively. IL-6 (100 U/ml or greater) increased spontaneous DNA synthesis (3H-TdR uptake) but, in the presence of high concentrations of TNF-alpha, inhibited TNF induced DNA synthesis in a dose dependent manner. Cell survival was reduced in the presence of anti-IL-6 mAb, while IL-6 was able to protect CLL cells from spontaneous apoptosis. These results suggest that IL-6 in an autocrine manner may inhibit DNA synthesis but prolongs survival in CLL cells. Increased serum IL-6 levels were detected in 27 of 50 cases of CLL, the mean level being significantly higher in Rai Stage III and IV cases compared to Rai Stage O-II cases." @default.
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- W2063485460 date "1996-01-01" @default.
- W2063485460 modified "2023-09-26" @default.
- W2063485460 title "Interleukin-6 Inhibits Apoptosis and Tumour Necrosis Factor Induced Proliferation of B-Chronic Lymphocytic Leukaemia" @default.
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- W2063485460 doi "https://doi.org/10.3109/10428199609051732" @default.
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