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. 1989 May;29(1):23–28. doi: 10.1007/BF00199912

Synergic action between tumor necrosis factor and endotoxins or poly(A·U) on cultured bovine endothelial cells

Paul A van de Wiel 1,✉, Raymond H H Pieters 1, Anita van der Pijl 1, Nanne Bloksma 1
PMCID: PMC11038234  PMID: 2706638

Abstract

In order to investigate whether direct effects on tumor vasculature may contribute to induction of necrosis of solid tumors in vivo, agents and combinations with an established different capacity to induce tumor necrosis were studied for their effects on endothelial cells in vitro. Tumor necrosis serum caused a marked inhibition of [3H]thymidine incorporation by bovine umbilical cord endothelial cells after 4h coincubation. Endotoxin was less inhibitory, whereas detoxified endotoxin and recombinant human tumor necrosis factor (rTNF) were hardly active in concentrations that can be achieved in vivo. Combinations of rTNF and (detoxified) endotoxin caused synergic inhibition. By 24h effects of the separate agents and synergic effects of the combinations were much stronger. The nontoxic dsRNA, poly(A·U), also had inhibitory activity, and acted synergistically with rTNF. Morphologically, a combination of endotoxin and rTNF but not the separate constituents induced marked cell detachment by 24 h, an indication of cell death. Whereas both endotoxin and rTNF inhibited DNA synthesis of human endothelial cells, the agents did not act synergistically on these cells. The ability of the agents and the combinations to affect endothelial cells in culture appeared to be well in line with their capacity to induce tumor necrosis. Data suggest that direct (synergic) effects on endothelium may contribute to the induction of vascular damage in tumors by (combinations of) the agents. The fact that endothelial cell death is only induced by the combinations and not by the separate agents in vivo, may be a cause of the greater therapeutic activity of the combinations in vivo. The synergy between rTNF and the other agents indicates that the agents act by different mechanisms.

Keywords: Endothelial Cell, Tumor Necrosis Factor, Thymidine Incorporation, Human Endothelial Cell, Tumor Vasculature

Footnotes

Supported by a grant of the Stichting Koningin Wilhelmina Fonds, Netherlands Cancer Foundation

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