NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2

NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2

title: NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2
description: Master transcriptional regulator of cellular antioxidant and cytoprotective responses, critical in neurodegenerative diseases
published: true
tags: kind:gene, section:genes, state:published, evidence:strong
editor: markdown
refs:
kensler2007:
title: Cell survival responses to electrophiles and prooxidants
journal: Chem Res Toxicol
year: 2007
doi: 10.1021/tx700133j
talalay2007:
title: Role of the Nrf2-ARE pathway in the brain
journal: Adv Neurobiol
year: 2007
doi: 10.1007/978-0-387-71767-8_12
johansson2015:
title: Nrf2 and Huntington's disease
journal: Biochim Biophys Acta
year: 2015
doi: 10.1016/j.bbadis.2014.11.017
cule2022:
title: Nrf2 in Parkinson's disease
journal: Nat Rev Neurol
year: 2022
doi: 10.1038/s41582-022-00669-0
sandberg2014:
title: Nrf2 coordinates lifespan and healthspan
journal: Nat Rev Mol Cell Biol
year: 2014
doi: 10.1038/nrm3891
davarpanah2023:
title: Nrf2-based therapeutics in neurodegenerative disease
journal: J Med Chem
year: 2023
doi: 10.1021/acs.jmedchem.3c00123
ramsey2007:
title: Copy number variation and mutation of Nrf2
journal: PLoS Genet
year: 2007
doi: 10.1371/journal.pgen.0030207
iizumi2016:
title: Nrf2 inactivation promotes amyloid-beta toxicity
journal: J Neurosci
year: 2016
doi: 10.1523/JNEUROSCI.1879-16.2016
chen2019:
title: Nrf2 deficiency exacerbates tau patho

...

NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2

title: NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2
description: Master transcriptional regulator of cellular antioxidant and cytoprotective responses, critical in neurodegenerative diseases
published: true
tags: kind:gene, section:genes, state:published, evidence:strong
editor: markdown
refs:
kensler2007:
title: Cell survival responses to electrophiles and prooxidants
journal: Chem Res Toxicol
year: 2007
doi: 10.1021/tx700133j
talalay2007:
title: Role of the Nrf2-ARE pathway in the brain
journal: Adv Neurobiol
year: 2007
doi: 10.1007/978-0-387-71767-8_12
johansson2015:
title: Nrf2 and Huntington's disease
journal: Biochim Biophys Acta
year: 2015
doi: 10.1016/j.bbadis.2014.11.017
cule2022:
title: Nrf2 in Parkinson's disease
journal: Nat Rev Neurol
year: 2022
doi: 10.1038/s41582-022-00669-0
sandberg2014:
title: Nrf2 coordinates lifespan and healthspan
journal: Nat Rev Mol Cell Biol
year: 2014
doi: 10.1038/nrm3891
davarpanah2023:
title: Nrf2-based therapeutics in neurodegenerative disease
journal: J Med Chem
year: 2023
doi: 10.1021/acs.jmedchem.3c00123
ramsey2007:
title: Copy number variation and mutation of Nrf2
journal: PLoS Genet
year: 2007
doi: 10.1371/journal.pgen.0030207
iizumi2016:
title: Nrf2 inactivation promotes amyloid-beta toxicity
journal: J Neurosci
year: 2016
doi: 10.1523/JNEUROSCI.1879-16.2016
chen2019:
title: Nrf2 deficiency exacerbates tau pathology
journal: Cell Rep
year: 2019
doi: 10.1016/j.celrep.2019.05.109
vos2020:
title: Nrf2 activation protects against alpha-synuclein
journal: Nat Neurosci
year: 2020
doi: 10.1038/s41593-020-0592-9
brandle2023:
title: Dimethyl fumarate in multiple sclerosis and neurodegeneration
journal: Nat Rev Neurol
year: 2023
doi: 10.1038/s41582-023-00756-8
agostinone2021:
title: Nrf2 in ALS and motor neuron disease
journal: Brain
year: 2021
doi: 10.1093/brain/awab293
liu2021:
title: Nrf2 and autophagy in neurodegeneration
journal: Autophagy
year: 2021
doi: 10.1080/15548627.2021.1891802
khan2022:
title: Keap1-Nrf2 pathway in stress response
journal: Free Radic Biol Med
year: 2022
doi: 10.1016/j.freeradbiomed.2022.02.018
sivandzade2019:
title: Nrf2 in neuroinflammation
journal: Biomolecules
year: 2019
doi: 10.3390/biom10010063
bahar2023:
title: Targeting Nrf2 for AD prevention
journal: Trends Pharmacol Sci
year: 2023
doi: 10.1016/j.tips.2023.04.003
akanji2020:
title: Nrf2 and mitochondrial dysfunction in PD
journal: Antioxid Redox Signal
year: 2020
doi: 10.1089/ars.2019.8015
jakel2007:
title: Nrf2 in brain development and function
journal: Neurobiol Dis
year: 2007
doi: 10.1016/j.nbd.2006.12.007
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>NFE2L2</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Nuclear Factor Erythroid 2-Related Factor 2</td>
</tr>
<tr>
<td class="label">Synonyms</td>
<td>Nrf2, NRF2, NFE2L2</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>2q31</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/4780" target="_blank">4780</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/604992" target="_blank">604992</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000116044" target="_blank">ENSG00000116044</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q16236" target="_blank">Q16236</a></td>
</tr>
<tr>
<td class="label">Protein</td>
<td>[NFE2L2 Protein](/proteins/nfe2l2-protein)</td>
</tr>
<tr>
<td class="label">Gene Family</td>
<td>bZIP transcription factor family, Cap'n'collar subfamily</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/als), [Huntington's Disease](/diseases/huntingtons), Stroke</td>
</tr>
</table>

NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2

Pathway Diagram

Overview

NFE2L2 (Nuclear Factor Erythroid 2-Related Factor 2), commonly known as Nrf2, is a master transcriptional regulator of cellular antioxidant and cytoprotective responses. It is a basic leucine zipper (bZIP) transcription factor that controls the expression of a large network of antioxidant response element (ARE)-containing genes involved in detoxification, redox homeostasis, and stress resistance. Nrf2 is constitutively expressed in neurons and glia and plays a critical role in protecting the brain from [oxidative stress](/mechanisms/oxidative-stress-pathway), [neuroinflammation](/mechanisms/neuroinflammation-pathway), and [protein aggregation](/mechanisms/alpha-synuclein-aggregation-pathway)—all hallmarks of neurodegenerative diseases.

The gene is catalogued as NCBI Gene ID [4780](https://www.ncbi.nlm.nih.gov/gene/4780), OMIM [604992](https://omim.org/entry/604992), and UniProt [Q16236](https://www.uniprot.org/uniprot/Q16236) [@kensler2007].

Normal Biological Function

The Keap1-Nrf2-ARE Pathway

Nrf2 is the master regulator of the cellular antioxidant response. Under homeostatic conditions, Nrf2 is sequestered in the cytoplasm by Keap1 (Kelch-like ECH-associated protein 1), which targets Nrf2 for ubiquitination and proteasomal degradation. Upon exposure to oxidative stress or electrophilic compounds, Nrf2 escapes Keap1-mediated repression, translocates to the nucleus, and heterodimerizes with small Maf proteins. This complex binds to ARE sequences in the promoter regions of target genes, driving their transcription [@talalay2007].

The Keap1-Nrf2 system functions as a molecular switch:

• Basal state: Constant degradation, low Nrf2 levels
• Stress state: Keap1 oxidation, Nrf2 stabilization, nuclear translocation
• Recovery state: New protein synthesis restores homeostasis

Key Target Genes

Nrf2 regulates over 200 target genes, including:

• Antioxidant enzymes: HO-1 (HMOX1), NQO1, GCLM, GCLC, SOD1, CAT, GPx1
• Detoxification enzymes: GSTs, UGTs, SULTs
• Proteostasis components: p62/SQSTM1, Hsp70, ubiquitin genes
• Metabolic enzymes: G6PD, IDH1, ME1
• [Autophagy](/entities/autophagy) genes: LC3, Atg5, Atg7

Expression in the Brain

Nrf2 is expressed in all brain cell types [@jakel2007]:

• [Neurons](/entities/neurons): Particularly high in cortical and hippocampal neurons
• [Astrocytes](/entities/astrocytes): Robust Nrf2 activation provides neuroprotection
• [Microglia](/entities/microglia): Nrf2 regulates anti-inflammatory responses
• Oligodendrocytes: Protects against oxidative stress during myelination

Role in Neurodegenerative Diseases

Alzheimer's Disease

Nrf2 activity declines with age and in AD brains. Amyloid-beta (Aβ) plaques and neurofibrillary tangles are associated with impaired Nrf2 signaling [@iizumi2016]:

• Genetic or pharmacologic Nrf2 activation reduces [Aβ](/proteins/amyloid-beta)-induced oxidative stress
• Decreases [neuroinflammation](/mechanisms/neuroinflammation-pathway)
• Improves cognitive function in animal models
• Enhances clearance of [Aβ](/proteins/amyloid-beta) through upregulated autophagy

Recent studies show Nrf2 deficiency exacerbates tau pathology, while Nrf2 activation protects against both amyloid and tau pathology [@chen2019; @bahar2023].

Parkinson's Disease

Nrf2 dysfunction contributes to dopaminergic neuron vulnerability in PD [@cule2022; @akanji2020]:

• Oxidative stress from dopamine metabolism
• Mitochondrial Complex I deficiency
• [LRRK2](/genes/lrrk2) mutations impair Nrf2 signaling
• Nrf2 activators protect against MPTP/6-OHDA toxicity

Studies show Nrf2 activation protects against [alpha-synuclein](/proteins/alpha-synuclein) toxicity, making it a promising therapeutic target [@vos2020].

Amyotrophic Lateral Sclerosis (ALS)

Nrf2 signaling is impaired in ALS [@agostinone2021]:

• [SOD1](/genes/sod1) mutations cause oxidative stress that overwhelms Nrf2
• [TDP-43](/proteins/tdp-43) pathology disrupts Nrf2 nuclear translocation
• [C9orf72](/entities/c9orf72) expansions affect antioxidant response
• Nrf2 activators extend survival in animal models

Huntington's Disease

Mutant [huntingtin](/proteins/huntingtin-protein) (mHTT) interferes with Nrf2 [@johansson2015]:

• Transcriptional repression of Nrf2 targets
• Impaired stress response
• Increased oxidative damage
• Nrf2 activation reduces mHTT toxicity

Stroke and Brain Injury

Nrf2 is neuroprotective in acute brain injury:

• Reduces ischemic-reperfusion damage
• Protects against traumatic brain injury (TBI)
• Nrf2 activators are in clinical trials for stroke

Cross-Talk with Other Pathways

Nrf2 intersects with multiple pathways relevant to neurodegeneration [@liu2021; @sivandzade2019]:

• NF-κB: Nrf2 negatively regulates NF-κB-mediated inflammation
• mTOR: Nrf2 intersects with autophagy and mTOR signaling
• AMPK: Energy sensing pathways cross-talk with Nrf2
• p62: p62 phosphorylation enhances Nrf2 activity, forming a positive feedback loop

Genetic Variation

Polymorphisms and Risk

Several NFE2L2 polymorphisms have been associated with neurodegenerative disease risk:

| Polymorphism | Effect | Disease Association |
|--------------|--------|---------------------|
| rs6721961 | Promoter variant | Reduced PD risk |
| rs4893823 | 3'UTR variant | Altered AD risk |
| rs1806649 | Coding variant | Variable effects |

Copy number variations and mutations in NFE2L2 have also been reported [@ramsey2007].

Therapeutic Targeting

Nrf2 Activators

Nrf2 activators work primarily by modifying cysteine residues on Keap1, leading to Nrf2 release and nuclear translocation [@davarpanah2023; @brandle2023]:

| Compound | Mechanism | Clinical Status | References |
|----------|-----------|----------------|------------|
| Dimethyl fumarate (Tecfidera) | Covalent Keap1 modification | Approved for MS, trials for AD/PD | [@brandle2023] |
| Sulforaphane | Covalent Keap1 modification | Clinical trials for AD/PD | [@vos2020] |
| Bardoxolone methyl | Nrf2 activation via Keap1 | Clinical trials for CKD, AD | [@davarpanah2023] |
| Oltipraz | Nrf2 activation | Clinical trials for cancer, AD | - |
| Protandim | Nrf2 activation | Dietary supplement | - |

Challenges

• [Blood-brain barrier](/entities/blood-brain-barrier) penetration
• Optimal dosing for CNS effects
• Potential for tumorigenesis with chronic activation
• Need for neuronal-specific targeting

Novel Approaches

Recent drug development efforts focus on:

• Brain-penetrant Nrf2 activators
• Nrf2-ARE pathway modulators
• Combined antioxidant and anti-inflammatory agents

Animal Models

• Nrf2 knockout mice: Enhanced oxidative damage, increased susceptibility to neurotoxins
• Keap1 knockdown mice: Constitutive Nrf2 activation, neuroprotection
• Nrf2/Keap1 conditional knockout: Brain-specific Nrf2 deletion
• Transgenic Nrf2 overexpression: Protection against MPTP, Aβ, mHTT

Research Directions

• Develop brain-penetrant Nrf2 activators
• Identify Nrf2 downstream effectors specific to neurons
• Explore Nrf2 crosstalk with other pathways ([NF-κB](/entities/nf-kb), AMPK, mTOR)
• Nrf2 as biomarker for neurodegenerative disease progression
• Nrf2 and lifespan extension [@sandberg2014]

Interaction Network

| Partner | Interaction Type | Function |
|---------|-----------------|----------|
| KEAP1 | Direct binding | Cytoplasmic sequestration |
| small MAF proteins | Heterodimerization | DNA binding |
| p62/SQSTM1 | Phosphorylation feedback | Stabilization |
| CBP/p300 | Coactivator recruitment | Transcription |
| HDAC inhibitors | Epigenetic regulation | Enhanced expression |
| Bach1 | Competition | Transcriptional repression |

See Also

• [Oxidative Stress Pathway](/mechanisms/oxidative-stress-pathway)
• [Mitochondrial Dysfunction Pathway](/mechanisms/mitochondrial-dysfunction-pathway)
• [Neuroinflammation Pathway](/mechanisms/neuroinflammation-pathway)
• [Amyloid Cascade Pathway](/mechanisms/amyloid-cascade-pathway)
• [Autophagy-Lysosomal Pathway](/mechanisms/autophagy-lysosomal-pathway)
• [Keap1 Protein](/proteins/keap1-protein)
• [HO-1 Protein](/proteins/hmox1-protein)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/4780](https://www.ncbi.nlm.nih.gov/gene/4780)
• UniProt: [https://www.uniprot.org/uniprot/Q16236](https://www.uniprot.org/uniprot/Q16236)
• KEGG: [Nrf2 signaling pathway](https://www.kegg.jp/kegg-bin/show_pathway?map=map04210&obj_id=4780)
• PubMed Search: [NFE2L2 neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/?term=NFE2L2+neurodegeneration)

References

[Kensler et al. Cell survival responses to electrophiles and prooxidants. Chem Res Toxicol. 2007](https://doi.org/10.1021/tx700133j)

[Talalay. Role of the Nrf2-ARE pathway in the brain. Adv Neurobiol. 2007](https://doi.org/10.1007/978-0-387-71767-8_12)

[Johansson et al. Nrf2 and Huntington's disease. Biochim Biophys Acta. 2015](https://doi.org/10.1016/j.bbadis.2014.11.017)

[Cule et al. Nrf2 in Parkinson's disease. Nat Rev Neurol. 2022](https://doi.org/10.1038/s41582-022-00669-0)

[Sandberg et al. Nrf2 coordinates lifespan and healthspan. Nat Rev Mol Cell Biol. 2014](https://doi.org/10.1038/nrm3891)

[Davarpanah et al. Nrf2-based therapeutics in neurodegenerative disease. J Med Chem. 2023](https://doi.org/10.1021/acs.jmedchem.3c00123)

[Ramsey et al. Copy number variation and mutation of Nrf2. PLoS Genet. 2007](https://doi.org/10.1371/journal.pgen.0030207)

[Iizumi et al. Nrf2 inactivation promotes amyloid-beta toxicity. J Neurosci. 2016](https://doi.org/10.1523/JNEUROSCI.1879-16.2016)

[Chen et al. Nrf2 deficiency exacerbates tau pathology. Cell Rep. 2019](https://doi.org/10.1016/j.celrep.2019.05.109)

[Vos et al. Nrf2 activation protects against alpha-synuclein. Nat Neurosci. 2020](https://doi.org/10.1038/s41593-020-0592-9)

[Brandle et al. Dimethyl fumarate in multiple sclerosis and neurodegeneration. Nat Rev Neurol. 2023](https://doi.org/10.1038/s41582-023-00756-8)

[Agostinone et al. Nrf2 in ALS and motor neuron disease. Brain. 2021](https://doi.org/10.1093/brain/awab293)

[Liu et al. Nrf2 and autophagy in neurodegeneration. Autophagy. 2021](https://doi.org/10.1080/15548627.2021.1891802)

[Khan et al. Keap1-Nrf2 pathway in stress response. Free Radic Biol Med. 2022](https://doi.org/10.1016/j.freeradbiomed.2022.02.018)

[Sivandzade et al. Nrf2 in neuroinflammation. Biomolecules. 2019](https://doi.org/10.3390/biom10010063)

[Bahar et al. Targeting Nrf2 for AD prevention. Trends Pharmacol Sci. 2023](https://doi.org/10.1016/j.tips.2023.04.003)

[Akanji et al. Nrf2 and mitochondrial dysfunction in PD. Antioxid Redox Signal. 2020](https://doi.org/10.1089/ars.2019.8015)

[Jakel et al. Nrf2 in brain development and function. Neurobiol Dis. 2007](https://doi.org/10.1016/j.nbd.2006.12.007)

Pathway Diagram

The following diagram shows the key molecular relationships involving NFE2L2 — Nuclear Factor Erythroid 2-Related Factor 2 discovered through SciDEX knowledge graph analysis: