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Effect of arsenic on transcription factor AP-1 and NF-kappa B DNA binding activity and related gene expression


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Hu, Y and Jin, XM and Snow, ET (2002) Effect of arsenic on transcription factor AP-1 and NF-kappa B DNA binding activity and related gene expression. Toxicology Letters, 133 (1). pp. 33-45. ISSN 0378-4274

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Both acute (24 h) and chronic (10-20 week) exposure of human fibroblast cells to low dose sodium arsenite (As(III)) significantly affects activating protein-1 (AP-1) and nuclear factor kappa B (NF-kappaB) DNA binding activity. Short-term treatment with 0.1-5 muM As(III) up-regulates expression of c-Fos and c-Jun and the redox regulators, thioredoxin (Trx) and Redox factor-1 (Ref-1) and activates both AP-1 and NF-kappaB binding. Chronic exposure to 0.1 or 0.5 muM As(III) decreased c-Jun, c-Fos and Ref-1 protein levels and AP-1 and NF-KB binding activity, but increased Trx expression. Short term exposure to phorbol 12-myristate 13-acetate (TPA), a phorbol ester tumour promoter, or hydrogen peroxide (H2O2) also activates AP-1 and NF-kappaB binding. However, pre-treatment with As(III) prevents this increase. These results suggest that As(III) may alter AP-1 and NF-KB activity, in part, by up-regulating Trx and Ref-1. The different effects of short- versus long-term As(III) treatment on acute-phase response to oxidative stress reflect changes in the expression of Ref-1, c-Fos and c-Jun, but not Trx. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.

Item Type: Article
Keywords: arsenite; redox; human fibroblasts; thioredoxin
Journal or Publication Title: Toxicology Letters
Page Range: pp. 33-45
ISSN: 0378-4274
Identification Number - DOI: 10.1016/S0378-4274(02)00083-8
Additional Information: The definitive version is available online at http://www.sciencedirect.com/
Date Deposited: 06 Sep 2007
Last Modified: 18 Nov 2014 03:21
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