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Evaluation of the In vivo Antitumor Activity of Polyanhydride IL-1α Nanoparticles
Published on: June 28, 2021
Cytocidal effect of interleukin 1 (IL-1) on HeLa cells is mediated by both soluble and transmembrane tumor necrosis
Małgorzata Doszczak1, Arkadiusz Pierzchalski1, Jolanta Grzenkowicz1
1Cell Biology Unit, Department of Medical Biotechnology, Intercollegiate Faculty of Biotechnology, Medical University of Gdańsk, ul. Dębinki 1, 80-210 Gdańsk, Poland.
Abstract:
Interleukin 1 (IL-1) is a pleiotropic cytokine able to induce cytocidal effect. The aim of the presented work was to analyze the mechanism of IL-1-induced cytocidal effect in HeLa cells in the presence of cycloheximide (CHX). We found that the pattern of IL-1-induced cell death shares significant similarities with the effect of tumor necrosis factor (TNF) in these cells. Subsequently, we identified IL-1 cytotoxicity as an indirect effect. The supernatant collected from the cells treated with IL-1 and CHX showed toxic activity towards IL-1-resistant while TNF-sensitive A9 cells. Furthermore, antibodies neutralizing TNF blocked HeLa cell death induced by IL-1/CHX. TNF was then detected in HeLa cells by means of flow cytometry, fluorescence microscopy and ELISA of detergent-soluble cell extracts. In the presence of an inhibitor of TNF sheddase (TACE), the cytotoxic effect of IL-1/CHX and the amount of TNF protein in detergent-soluble cell extracts were enhanced. These results suggest that in response to interleukin 1/CHX, the amount of transmembrane TNF is increased. Taken together, we demonstrated that the mechanism of IL-1 cytotoxic activity in HeLa cells in the presence of CHX depends on the function of soluble and transmembrane TNF.
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