NRF2 supports non-small cell lung cancer growth independently of CBP/p300-enhanced glutathione synthesis
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View abstract on PubMed
Summary
This summary is machine-generated.Nuclear factor erythroid 2-related factor 2 (NRF2) drives non-small cell lung cancer growth independently of glutathione production. NRF2-dependent cancer cell proliferation does not require enhanced antioxidant defenses, challenging established roles.
Area Of Science
- Oncology
- Molecular Biology
- Cancer Genomics
Background
- Nuclear factor erythroid 2-related factor 2 (NRF2) is a transcription factor crucial for cellular defense against oxidative stress.
- Mutational activation of NRF2 occurs in approximately 25% of aggressive non-small cell lung cancers (NSCLC), suggesting its role in cancer progression.
- The precise mechanisms driving NRF2 dependency in NSCLC remain incompletely understood.
Purpose Of The Study
- To identify novel NRF2 target genes associated with NRF2 dependency in NSCLC cell lines.
- To investigate the role of enhancer regions and epigenetic modifications in NRF2-mediated gene regulation.
- To determine the necessity of CBP/p300 coactivation and glutathione production for NRF2-driven NSCLC cell growth.
Main Methods
- Integrated genomic analyses, including NRF2 occupancy studies and H3K27ac profiling.
- Characterization of enhancer RNA (eRNA) synthesis.
- Metabolic profiling and assessment of cell growth in the presence or absence of CBP/p300.
- Analysis of NRF2 target gene sets in NSCLC cell lines.
Main Results
- A novel set of NRF2 target genes was identified, with some lacking promoter-proximal NRF2 binding.
- Extensive NRF2-dependent eRNA synthesis and H3K27ac deposition were observed at regulatory enhancer regions.
- NRF2-dependent NSCLC cell growth proceeded independently of CBP/p300 coactivation.
- CBP/p300 primarily mediated NRF2-dependent accumulation of glutathione and related metabolites, which was not essential for cancer cell proliferation.
Conclusions
- NRF2 sustains transcriptional activity and NSCLC cell growth through mechanisms distinct from CBP/p300 coactivation.
- Enhanced glutathione production, typically linked to NRF2's antioxidant role, is not required for NRF2-dependent NSCLC growth.
- These findings reveal a non-canonical role for NRF2 in driving NSCLC progression, independent of its canonical redox homeostasis functions.
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