Nrf2 regulates ROS production by mitochondria and NADPH oxidase

Stjepana Kovac, Plamena R. Angelova, Kira M. Holmström, Ying Zhang, Albena T. Dinkova-Kostova (Lead / Corresponding author), Andrey Y. Abramov (Lead / Corresponding author)

    Research output: Contribution to journalArticle

    216 Citations (Scopus)

    Abstract

    BACKGROUND: Nuclear factor (erythroid-derived 2) factor 2 (Nrf2) is a crucial transcription factor mediating protection against oxidants. Nrf2 is negatively regulated by cytoplasmic Kelch-like ECH associated protein 1 (Keap1) thereby providing inducible antioxidant defence. Antioxidant properties of Nrf2 are thought to be mainly exerted by stimulating transcription of antioxidant proteins, whereas its effects on ROS production within the cell are uncertain.

    METHODS: Live cell imaging and qPCR in mouse embryonic fibroblasts (MEFs), brain hippocampal glio-neuronal cultures and explants slice cultures with graded expression of Nrf2, i.e. Nrf2-knockout (Nrf2-KO), wild-type (WT), and Keap1-knockdown (Keap1-KD).

    RESULTS: We here show that ROS production in Nrf2-KO cells and tissues is increased compared to their WT counterparts. Mitochondrial ROS production is regulated by the Keap1-Nrf2 pathway by controlling mitochondrial bioenergetics. Surprisingly, Keap1-KD cells and tissues also showed higher rates of ROS production when compared to WT, although with a smaller magnitude. Analysis of the mRNA expression levels of the two NOX isoforms implicated in brain pathology showed, that NOX2 is dramatically upregulated under conditions of Nrf2 deficiency, whereas NOX4 is upregulated when Nrf2 is constitutively activated (Keap1-KD) to a degree which paralleled the increases in ROS production.

    CONCLUSIONS: These observations suggest that the Keap1-Nrf2 pathway regulates both mitochondrial and ROS production through NADPH oxidase.

    GENERAL SIGNIFICANCE: Findings supports a key role of the Keap1-Nrf2 pathway in redox homeostasis within the cell.

    Original languageEnglish
    Pages (from-to)794-801
    Number of pages8
    JournalBiochimica et Biophysica Acta: General Subjects
    Volume1850
    Issue number4
    DOIs
    Publication statusPublished - Apr 2015

    Keywords

    • Keap1
    • NADPH oxidase
    • NOX
    • Nrf2
    • ROS

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    Dinkova-Kostova, Albena

    • Cellular Medicine - Professor (Teaching and Research) & Professor of Chemical Biology

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