Cytokine regulation of interleukin 6 production by human endothelial cells

Cellular Immunology
M R ShalabyT Espevik

Abstract

The influence of recombinant (r) human tumor necrosis factor alpha (rTNF-alpha), r human interleukin 1 beta (rIL-1 beta), and r human interferon gamma (rIFN-gamma) on the production of interleukin 6 (IL-6) by human endothelial cells (HEC) was investigated. The addition of 1-100 U/ml of either rTNF-alpha or rIL-1 beta to cultures of HEC monolayers caused a dose-related increase in IL-6 production as detected after 24 hr of incubation. In contrast to rIL-1 beta and rTNF-alpha, the use of up to 1000 U/ml of rIFN-gamma caused only a moderate increase in IL-6 production. However, significantly greater quantities of IL-6 were produced by HEC monolayers subjected to 1000 U/ml of rIFN-gamma in combination with 1-100 U/ml of rTNF-alpha. Furthermore, the addition of graded concentrations of human transforming growth factor beta (TGF-beta) to cultures resulted in a dose-related inhibition of rIL-1 beta- and rTNF-alpha-induced IL-6 production by HEC. The results demonstrate that rIL-1 beta and rTNF-alpha share the ability to stimulate HEC for production of IL-6 and indicate that TGF-beta may act as an immunosuppressive agent, at least partially, through its ability to inhibit the action of TNF-alpha and IL-1 on endothelial cells.

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