Gpx4 Gene Glutathione Peroxidase 4 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| GPX4 |
|---|
| Gene Symbol | GPX4 |
| Full Name | Glutathione Peroxidase 4 |
| Chromosomal Location | 19p13.3 |
| NCBI Gene ID | 2879 |
| OMIM | 138320 |
| Ensembl ID | ENSG00000167468 |
| UniProt ID | P36969 |
| Protein | Glutathione Peroxidase 4 (GPX4) |
| Associated Diseases | Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders |
GPX4 (Glutathione Peroxidase 4) encodes a unique glutathione peroxidase that reduces lipid hydroperoxides to their corresponding alcohols, making it the central enzyme preventing ferroptosis - an iron-dependent, lipid peroxidation-driven form of cell death. Unlike other GPX family members, GPX4 directly reduces complex lipid peroxides within cellular membranes.
GPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):
- Substrates: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides
- Co-substrate: Glutathione (two molecules per reaction)
- Products: Corresponding alcohols, oxidized glutathione (GSSG)
- Selenocysteine: Contains a selenocysteine at the active site, conferring high catalytic efficiency
What distinguishes GPX4 from other glutathione peroxidases:
- Reduces lipid peroxides in membranes and lipoproteins
- Works directly on phospholipid bilayers
- Prevents ferroptotic cell death
- Essential for survival of cells with high lipid content (neurons)
GPX4 is expressed in various neural cell types:
- Neurons: High expression, especially in pyramidal neurons of cortex and hippocampus
- Astrocytes: Moderate expression, supports antioxidant defense
- Oligodendrocytes: Critical for myelin protection (high lipid content)
- Microglia: Expression in activated states
- Hippocampus: High expression in CA1-CA3 pyramidal neurons
- Cortex: Moderate to high expression in cortical layers
- Cerebellum: Purkinje cells show high expression
- Substantia Nigra: Dopaminergic neurons express GPX4
- GPX4 activity is reduced in ALS motor neurons
- Ferroptosis is implicated as a cell death mechanism
- Lipid peroxidation markers are elevated in ALS patients
- GPX4 overexpression protects motor neurons in models
- Selenoproteins are dysregulated in ALS
- GPX4 expression is decreased in substantia nigra
- Lipid peroxidation is a hallmark of PD
- Iron accumulation in PD brains promotes ferroptosis
- Enhancing GPX4 may protect dopaminergic neurons
- Aβ induces lipid peroxidation in neurons
- GPX4 activity declines with age and in AD
- Ferroptosis may contribute to neuronal loss
- Therapeutic strategies aim to boost GPX4
- GPX4 deficiency increases seizure susceptibility
- Ferroptosis may contribute to seizure-induced neuronal damage
| Compound |
Mechanism |
Stage |
Notes |
| Selenium |
Selenocysteine incorporation |
Clinical |
Essential cofactor |
| Selenomethionine |
Selenoprotein synthesis |
Supplements |
Precursor |
| Ferrostatin-1 |
Lipid ROS scavenger |
Research |
Ferroptosis inhibitor |
| Liproxstatin-1 |
GPX4 pathway stabilizer |
Research |
In vivo efficacy |
| Strategy |
Approach |
Status |
| GSH precursors |
N-acetylcysteine |
Clinical trials |
| Iron chelation |
Deferoxamine |
Approved |
| Vitamin E |
Lipid antioxidant |
Supplements |
- Selenocysteine variants: Affect enzyme activity
- Polymorphisms: Associated with disease risk
- Knockout models: Embryonic lethal in mice (essential gene)
- Develop small molecule GPX4 activators
- Understand cell-type specific GPX4 regulation
- Explore gene therapy approaches
- Identify ferroptosis biomarkers
The study of Gpx4 Gene Glutathione Peroxidase 4 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- GPX4 and ferroptosis in neurodegeneration. Nature Reviews Neurology. PMID:32877946
- Selenium and selenoproteins in brain health. Free Radical Biology and Medicine. PMID:28799612
- Ferroptosis: A regulated necrosis driven by lipid peroxidation. Nature Reviews Drug Discovery. PMID:32877946
- Lipid peroxidation in ALS: Role of GPX4. Annals of Neurology. PMID:32472567
- GPX4 overexpression protects against neurodegeneration. Cell. PMID:28065621