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- W66692777 abstract "TNF alpha and TNF beta were compared regarding their binding to different types of target cells, cytotoxic/cytostatic activity against murine and human tumor cell lines as well as human capillary endothelial cells, their ability to induce differentiation in myeloid leukemia cell lines, and induction of hemorrhagic tumor necrosis and tumor regression as well as lethal toxicity in tumor-bearing mice. The results show considerable quantitative differences in the biological activity between TNF alpha and TNF beta depending on the type of target cell which has been used. TNF beta was 3 fold more cytotoxic than TNF alpha against murine L929 fibroblasts and 3-5 times more active concerning the induction of hemorrhagic tumor necrosis, complete tumor regression and more toxic in tumor-bearing mice. In contrast to this, TNF beta was markedly less cytotoxic against human capillary endothelial cells and the human mammary carcinoma cell line MCF7 and much less cytostatic against the human myeloid leukemia cell lines HL60 and U937. The lesser antiproliferative effect of TNF beta correlated with a lower ability for induction of differentiation in these cell lines. Competitive radioligand binding assays showed that TNF beta was about 4 fold more effective than TNF alpha in competing with 125I-labeled TNF alpha for the binding to murine L929 fibroblasts. But it was 15-20 times less effective in binding to the human MCF7 cells and the human myeloid leukemia cell lines HL60 and U937. This revealed that, at least for these targets, the differences in the biological activity between TNF alpha and TNF beta are due to different abilities for binding to the target cells. Possible mechanisms for these different binding abilities are discussed." @default.
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- W66692777 title "Differences in the biological activity of TNF alpha and TNF beta correlate with their different abilities for binding to the target cells." @default.
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