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. 1985 Nov;82(22):7626–7630. doi: 10.1073/pnas.82.22.7626

Tumor necrosis factor: specific binding and internalization in sensitive and resistant cells.

M Tsujimoto, Y K Yip, J Vilcek
PMCID: PMC391386  PMID: 2999773

Abstract

Highly purified, Escherichia coli-derived recombinant human tumor necrosis factor (TNF) was labeled with 125I and employed to determine receptor binding, internalization, and intracellular degradation in murine L929 cells (highly sensitive to the cytotoxic action of TNF) and in diploid human FS-4 cells (resistant to TNF cytotoxicity). 125I-labeled TNF bound specifically to high-affinity receptors on both L929 and FS-4 cells. Scatchard analysis of the binding data indicated the presence of 2200 binding sites per L929 cell and 7500 binding sites per FS-4 cell. The calculated dissociation constants are 6.1 X 10(-10) M and 3.2 X 10(-10) M for L929 and FS-4 cells, respectively. In both L929 and FS-4 cells, incubation at 37 degrees C resulted in a rapid internalization of the bulk of the cell-bound TNF, followed by the appearance of trichloroacetic acid-soluble 125I radioactivity in the tissue culture medium, due to degradation of TNF. Degradation but not cellular uptake of TNF was inhibited in the presence of chloroquine (an inhibitor of lysosomal proteases) in both L929 and FS-4 cells, suggesting that degradation occurs intracellularly, probably within lysosomes. These results show that resistance of FS-4 cells to TNF cytotoxicity is not due to a lack of receptors or their inability to internalize and degrade TNF.

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Selected References

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