The cytoprotective role of the Keap1-Nrf2 pathway

    Research output: Contribution to journalReview articlepeer-review

    593 Citations (Scopus)

    Abstract

    An elaborate network of highly inducible proteins protects aerobic cells against the cumulative damaging effects of reactive oxygen intermediates and toxic electrophiles, which are the major causes of neoplastic and chronic degenerative diseases. These cytoprotective proteins share common transcriptional regulation, through the Keap1-Nrf2 pathway, which can be activated by various exogenous and endogenous small molecules (inducers). Inducers chemically react with critical cysteine residues of the sensor protein Keap1, leading to stabilisation and nuclear translocation of transcription factor Nrf2, and ultimately to coordinate enhanced expression of genes coding for cytoprotective proteins. In addition, inducers inhibit pro-inflammatory responses, and there is a linear correlation spanning more than six orders of magnitude of concentrations between inducer and anti-inflammatory activity. Genetic deletion of transcription factor Nrf2 renders cells and animals much more sensitive to the damaging effects of electrophiles, oxidants and inflammatory agents in comparison with their wild-type counterparts. Conversely, activation of the Keap1-Nrf2 pathway allows survival and adaptation under various conditions of stress and has protective effects in many animal models. Cross-talks with other signalling pathways broadens the role of the Keap1-Nrf2 pathway in determining the fate of the cell, impacting fundamental biological processes such as proliferation, apoptosis, angiogenesis and metastasis.

    Original languageEnglish
    Pages (from-to)241-272
    Number of pages32
    JournalArchives of Toxicology
    Volume85
    Issue number4
    DOIs
    Publication statusPublished - Apr 2011

    Keywords

    • Keap1
    • Nrf2
    • Cytoprotective enzymes
    • Phase 2 inducer
    • TRANSCRIPTION FACTOR NRF2
    • ANTIOXIDANT-RESPONSE ELEMENT
    • PROTEIN-KINASE-C
    • NF-KAPPA-B
    • GLUTATHIONE-S-TRANSFERASE
    • URINARY-BLADDER CARCINOGENESIS
    • OXIDATIVE STRESS-RESPONSE
    • CANCER-PROTECTIVE ENZYMES
    • ACTIVITY-GUIDED ISOLATION
    • UBIQUITIN LIGASE COMPLEX

    Cite this