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- W2066031848 abstract "Investigations were undertaken to study the influence of oxygen levels on tumor necrosis factor [symbol: see text] (TNF [symbol: see text] toxicity in vitro.The cell line used to assess the cytotoxicity of TNF [symbol: see text] the mouse fibroblast line L929. The cell line was incubated under conditions of 21%, 10%, 5% and 2% oxygen either before or during exposure to TNF [symbol: see text]. All incubations with TNF were for 24 h in the presence of 1 microgram/ml actinomycin D. Cell number was assessed immediately following treatment by a colormetric method.By preincubating L929 cells under various oxygen conditions for 24 h prior to incubating with TNF [symbol: see text], we show that pretreatment does influence TNF [symbol: see text] cytotoxicity since up to 50 times more TNF [symbol: see text] is required to elicit the same survival level when L929 cells have been preincubated for 24 h at oxygen levels relevant to those in solid tumors, that is 2% rather than at 21%. A 24 h preincubation under an environment of 5% oxygen is not as effective at inducing resistance to TNF [symbol: see text] as incubation under 2% oxygen. However, this resistance could be significantly enhanced by lengthening the preincubation time. Indeed cells cultured for five passages under 5% oxygen levels are approximately 50 times more resistant to TNF [symbol: see text] than cells cultured under 21% oxygen. The resistance induced by conditions of reduced oxygen tension could be reversed over a 24 h period if cells were returned to an environment containing of reduced oxygen tension could be reversed over a 24 h period if cells were returned to an environment containing 21% oxygen.The oxygen content of the cellular microenvironment has a profound influence on the cytotoxic action of TNF." @default.
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- W2066031848 title "The influence of microenvironment on the cytotoxicity of TNF ∞ in vitro" @default.
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- W2066031848 doi "https://doi.org/10.1016/0360-3016(94)90440-5" @default.
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