Activation of the NRF2 Signaling Pathway by Copper-Mediated Redox Cycling of Para- and Ortho-Hydroquinones

Xiu Jun Wang, John D. Hayes, Larry G. Higgins, C. Roland Wolf, Albena T. Dinkova-Kostova

Research output: Contribution to journalArticle

Abstract

Transcription factor NF-E2 p45-related factor 2 (Nrf2) mediates adaptation to oxidants and electrophiles through up-regulating genes that contain antioxidant response elements (AREs) in their promoters. Using the stably transfected human AREc32 reporter cell line, we found that copper and other transition metals enhanced induction of ARE-driven luciferase by 2-tert-butyl-1,4-hydroquinone (tBHQ) as a result of increased oxidation to 2-tert-butyl-1,4-benzoquinone (tBQ). Following exposure to tBHQ for 30 min, ARE-luciferase activity measured after 24 hr was dependent on the presence of Cu2+. In contrast, tBQ-induced activity was Cu2+-independent. The metal-catalyzed oxidation of tBHQ to tBQ occured rapidly and stoichiometrically. Compounds that share para- or ortho-hydroquinone structures, such as catechol estrogens, dopamine, and l-DOPA, also induced ARE-driven luciferase in a Cu2+-dependent manner. Thus, the oxidation of para- and ortho-hydroquinones to quinones represents the rate-limiting step in the activation of Nrf2.

Original languageEnglish (US)
Pages (from-to)75-85
Number of pages11
JournalChemistry and Biology
Volume17
Issue number1
DOIs
StatePublished - Jan 29 2010

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Antioxidant Response Elements
Hydroquinones
Oxidation-Reduction
Copper
Luciferases
Chemical activation
NF-E2-Related Factor 2
Oxidation
NF-E2 Transcription Factor
Metals
Catechol Estrogens
Quinones
Oxidants
Transition metals
Dopamine
Transcription Factors
Genes
Cells
Cell Line
hydroquinone

Keywords

  • CHEMBIO
  • SIGNALING

ASJC Scopus subject areas

  • Biochemistry
  • Drug Discovery
  • Molecular Biology
  • Clinical Biochemistry
  • Molecular Medicine
  • Pharmacology

Cite this

Activation of the NRF2 Signaling Pathway by Copper-Mediated Redox Cycling of Para- and Ortho-Hydroquinones. / Wang, Xiu Jun; Hayes, John D.; Higgins, Larry G.; Wolf, C. Roland; Dinkova-Kostova, Albena T.

In: Chemistry and Biology, Vol. 17, No. 1, 29.01.2010, p. 75-85.

Research output: Contribution to journalArticle

Wang, Xiu Jun ; Hayes, John D. ; Higgins, Larry G. ; Wolf, C. Roland ; Dinkova-Kostova, Albena T. / Activation of the NRF2 Signaling Pathway by Copper-Mediated Redox Cycling of Para- and Ortho-Hydroquinones. In: Chemistry and Biology. 2010 ; Vol. 17, No. 1. pp. 75-85.
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