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Nrf2 in Cancer, Detoxifying Enzymes and Cell Death Programs
Tabitha Jenkins1, Jerome Gouge1
1Institute of Structural and Molecular Biology, Birkbeck College, University of London, London WC1E 7HX, UK.
Abstract:
Reactive oxygen species (ROS) play an important role in cell proliferation and differentiation. They are also by-products of aerobic living conditions. Their inherent reactivity poses a threat for all cellular components. Cells have, therefore, evolved complex pathways to sense and maintain the redox balance. Among them, Nrf2 (Nuclear factor erythroid 2-related factor 2) plays a crucial role: it is activated under oxidative conditions and is responsible for the expression of the detoxification machinery and antiapoptotic factors. It is, however, a double edge sword: whilst it prevents tumorigenesis in healthy cells, its constitutive activation in cancer promotes tumour growth and metastasis. In addition, recent data have highlighted the importance of Nrf2 in evading programmed cell death. In this review, we will focus on the activation of the Nrf2 pathway in the cytoplasm, the molecular basis underlying Nrf2 binding to the DNA, and the dysregulation of this pathway in cancer, before discussing how Nrf2 contributes to the prevention of apoptosis and ferroptosis in cancer and how it is likely to be linked to detoxifying enzymes containing selenium.
Insights
Nuclear factor erythroid 2-related factor 2 (Nrf2) regulates cellular defense against oxidative stress. While protective in healthy cells, its overactivation in cancer promotes tumor growth and resistance to cell death.
Area of Science:
- Cellular Biology
- Molecular Biology
- Cancer Research
Background:
- Reactive oxygen species (ROS) are vital for cell signaling but can damage cellular components.
- Cells maintain redox balance via complex pathways, with Nrf2 (Nuclear factor erythroid 2-related factor 2) being a key regulator.
- Nrf2 activation under oxidative stress induces detoxification and antiapoptotic factors.
Purpose of the Study:
- To review the activation and function of the Nrf2 pathway.
- To explore the role of Nrf2 dysregulation in cancer.
- To discuss Nrf2's involvement in preventing apoptosis and ferroptosis in cancer.
Main Methods:
- Literature review focusing on Nrf2 pathway activation, DNA binding, and cancer-related dysregulation.
- Analysis of Nrf2's role in apoptosis and ferroptosis evasion.
- Exploration of Nrf2's link to selenium-containing detoxifying enzymes.
Main Results:
- Nrf2 is activated in the cytoplasm under oxidative stress.
- Constitutive Nrf2 activation in cancer fuels tumor growth and metastasis.
- Nrf2 plays a significant role in cancer cells evading programmed cell death, including apoptosis and ferroptosis.
Conclusions:
- The Nrf2 pathway is a critical regulator of cellular redox homeostasis with dual roles in health and disease.
- Dysregulation of Nrf2 in cancer contributes to tumorigenesis and resistance to therapy.
- Further research into Nrf2's interaction with detoxifying enzymes may reveal new therapeutic strategies.
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