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Short Communications |
From the Institute of Pathology/Tumor Immunology,*
University of Regensburg, Regensburg, Germany; Pharmaceutical Research
Gene Technology,
F. Hoffmann-LaRoche, Basel,
Switzerland; and the Institute of Pathology,
Technical University Dresden, Dresden, Germany
Activation of endothelial cells, fibrin deposition, and coagulation within the tumor vasculature has been shown in vivo to correlate with the occurrence of tumor necrosis factor (TNF)-induced tumor necrosis in mice. In the present study we investigated which target cells mediate the TNF-induced necrosis in fibrosarcomas grown in wild type (wt), TNF receptor type 1-deficient (TNFRp55-/-), and TNF receptor type 2-deficient (TNFRp75-/-) mice. TNF administration resulted in tumor necrosis exclusively in wt and TNFRp75-/-, but not in TNFRp55-/- mice, indicating a dependence of TNF-mediated tumor necrosis on the expression of TNF receptor type 1. However, using wt and TNFRp55-/- fibrosarcomas in wt mice, we found that TNF-mediated tumor necrosis was completely independent of TNF receptor type 1 expression in tumor cells. Thus we could exclude any direct tumoricidal effect of TNF in this model. Soluble TNF induced leukostasis in wt and TNFRp75-/- mice but not in TNFRp55-/- mice. TNF-induced leukostasis in TNFRp55-/- mice was restored by adoptive bone marrow transplantation of wt hematopoietic cells, but TNF failed to induce tumor necrosis in these chimeric mice. Because TNF administration resulted in both activation and focal damage of tumor endothelium, TNF receptor type 1-expressing cells of the tumor vasculature, likely to be endothelial cells, appear to be target cells for mediating TNF-induced tumor necrosis.
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