NF kappa B-independent transcriptional induction of the human manganous superoxide dismutase gene

Archives of Biochemistry and Biophysics
S Borrello, B Demple

Abstract

Numerous conditions induce expression of manganese-containing superoxide dismutase (MnSOD) in mammalian cells. The reported inducers of MnSOD are all agents that activate two transcription factors, AP-1 and NF kappa B, but several reports have suggested that MnSOD induction relies solely on NF kappa B. We investigated the contribution of the individual transcription factors by using antioxidants and metal chelators to modulate MnSOD transcriptional activation in response to phorbol esters or hydrogen peroxide. The results indicate substantial transcriptional induction of the MnSOD gene independent of NF kappa B. The metal chelator and antioxidant pyrrolidine dithiocarbamate (PDTC) at 60 or 100 microM induced the MnSOD transcript in HeLa cells while diminishing expression of the NF kappa B-responsive transcript I kappa B-alpha. Induction of the MnSOD mRNA by phorbol-12-myristate-13-acetate (PMA) was only slightly diminished in the presence of PDTC, which in contrast virtually eliminated induction of the NF kappa B-dependent transcript I kappa B-alpha by PMA. MnSOD RNA induction by H2O2 was only approximately 1.5-fold, compared to a ca. 3-fold activation of I kappa B-alpha expression. Two other antioxidants, N-acetyl-L-cysteine a...Continue Reading

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Citations

Aug 11, 2010·Omics : a Journal of Integrative Biology·Nathalie LandstetterKarl Kuchler
Jul 30, 2009·Journal of Biomedicine & Biotechnology·Xiuli ChangZhijun Zhou
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