Volume 10, Issue 2-3 p. 145-156
Article

Redox regulation of TNF signaling

Vera Goossens

Vera Goossens

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

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Kurt De Vos

Kurt De Vos

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

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Dominique Vercammen

Dominique Vercammen

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

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Margino Steemans

Margino Steemans

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

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Katia Vancompernolle

Katia Vancompernolle

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

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Walter Fiers

Walter Fiers

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

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Peter Vandenabeele

Peter Vandenabeele

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

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Johan Grooten

Corresponding Author

Johan Grooten

Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, Gent, Belgium

J. Grooten, Department of Molecular Biology, Flanders Interuniversity Institute for Biotechnology and University of Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium. Tel.: +32 9 2645310; Fax: +32 9 2645348Search for more papers by this author
First published: 16 December 2008
Citations: 108

Abstract

TNF is produced during inflammation and induces, among other activities, cell death in sensitive tumour cells. We previously reported an increased generation of ROS in TNF-treated L929 fibrosarcoma cells prior to cell death. These ROS are of mitochondrial origin and participate in the cell death process. Presently, we focus on the identification of parameters that control ROS production and subsequent cytotoxicity. From the cytotoxic properties and susceptibility to scavenging of TNF-induced ROS as compared to pro-oxidant-induced ROS we conclude that TNF-mediated ROS generation and their lethal action are confined to the inner mitochondrial membrane. Oxidative substrates, electron-transport inhibitors, glutathione and thiol-reactive agents but also caspase inhibitors modulate TNF-induced ROS production and imply the existence of a negative regulator of ROS production. Inactivation of this regulator by a TNF-induced reduction of NAD(P)H levels and/or formation of intraprotein disulfides would be responsible for ROS generation.