Lipopolysaccharide-induced expression of NAD(P)H:quinone oxidoreductase 1 and heme oxygenase-1 protects against excessive inflammatory responses in human monocytes

Rushworth, Stuart, Macewan, David and O'Connell, Maria (2008) Lipopolysaccharide-induced expression of NAD(P)H:quinone oxidoreductase 1 and heme oxygenase-1 protects against excessive inflammatory responses in human monocytes. Journal of Immunology, 181. pp. 6730-6737. ISSN 0022-1767

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Abstract

Monocytes play a central role in the immunopathological effects of sepsis. This role is mediated by production of the cytokines TNF-a and IL-1ß. The transcription factor NF-E2-related factor 2 (Nrf2) regulates innate immune responses in various experimental disease models. Presently, the role of Nrf2-regulated genes in LPS-treated human monocytes is not well defined. Herein we show that Nrf2 mediates a significant regulation of LPS-induced inflammatory responses. Analysis of Nrf2-regulated gene expression in human monocytes showed that LPS induced the expression of the phase II detoxification gene NAD(P)H:quinone oxidoreductase 1 (NQO1). Furthermore, NQO1 mRNA or protein expression in response to LPS was regulated by Nrf2. Silencing Nrf2 expression in human monocytes inhibited LPS-induced NQO1 expression; however, in contrast, it significantly increased TNF and IL-1ß production. Silencing expression of NQO1 alone, or in combination with heme oxygenase-1 (HO-1) silencing, markedly increased LPS-induced TNF and IL-1ß expression. Additionally, overexpression of NQO1 and/or HO-1 inhibited LPS-induced TNF and IL-1ß expression. These results show for the first time that LPS induces NQO1 and HO-1 expression in human monocytes via Nrf2 to modulate their inflammatory responsiveness, thus providing novel potential therapeutic strategies for the treatment of sepsis.

Item Type: Article
Faculty \ School: Faculty of Science > School of Pharmacy
Depositing User: Rachel Smith
Date Deposited: 15 Mar 2011 16:45
Last Modified: 27 Jun 2019 20:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/26312
DOI:

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