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. 1992 Nov;66(11):6288–6293. doi: 10.1128/jvi.66.11.6288-6293.1992

Antioxidants selectively suppress activation of NF-kappa B by human T-cell leukemia virus type I Tax protein.

R Schreck 1, R Grassmann 1, B Fleckenstein 1, P A Baeuerle 1
PMCID: PMC240120  PMID: 1404592

Abstract

Oxygen radical scavengers, such as dithiocarbamates and cysteine derivatives, inhibit activation of the ubiquitous transcription factor nuclear factor kappa B (NF-kappa B) after treatment of cells with tumor necrosis factor, phorbol ester, and interleukin-1. An involvement of oxygen radicals was more directly evident from the induction of NF-kappa B by low concentrations of H2O2 and the demonstration that cells stimulated with various NF-kappa B inducers release H2O2 and superoxide. In this study, we used the antioxidant pyrrolidine dithiocarbamate (PDTC) to investigate whether the activation of NF-kappa B by the viral transactivator Tax from human T-cell leukemia virus type I also depends on the production of reactive oxygen intermediates. The Tax-induced activation of the DNA-binding activity of NF-kappa B in Jurkat T cells was potently suppressed by micromolar concentrations of PDTC. Within the same concentration range, PDTC and two other dithiocarbamates also strongly interfered with transactivation of the long terminal repeat (LTR) of human immunodeficiency virus type 1 by Tax but had no effect on transactivation of the same LTR by Tat. Transactivation of the human T-cell leukemia virus type I LTR by Tax was also barely influenced. Tax seems to activate NF-kappa B by a mechanism shared with all other inducers of NF-kappa B tested so far. It appears that one of the pleiotropic activities of Tax leads to an enhanced production of oxygen radicals that are required for activation of NF-kappa B.

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Selected References

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