Nrf3 negatively regulates antioxidant-response element-mediated expression and antioxidant induction of NAD(P)H:quinone oxidoreductase1 gene.

The Journal of Biological Chemistry
Kannan Sankaranarayanan, Anil K Jaiswal

Abstract

Antioxidant-response element (ARE) and nuclear factor Nrf2-mediated expression and coordinated induction of genes encoding chemopreventive proteins, including NQO1, are critical mechanisms in chemoprotection. Recently, Nrf3, a new member of the Nrf family with substantial homology to Nrf2, was identified and cloned. In this report, we have investigated the role of Nrf3 in ARE-mediated gene expression and induction of NQO1 in response to antioxidants. Overexpression of Nrf3 in Hep-G2 cells led to a concentration-dependent decrease in transfected and endogenous NQO1 gene expression and induction in response to antioxidant tert-butylhydroquinone (t-BHQ). Deletion mutation analysis revealed that Nrf3 repression of NQO1 gene expression required heterodimerization and DNA binding domains but not transcriptional activation domain of Nrf3. Bandshift and supershift assays with in vitro transcribed and translated proteins and nuclear extracts from Hep-G2 cells treated with Me2SO and t-BHQ and immunoprecipitation assays demonstrated that Nrf3 associates with small Maf proteins to bind to the ARE. RNA interference specific to Nrf3 reduced intracellular Nrf3 leading to increased expression and induction of transfected and endogenous NQO1 ge...Continue Reading

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