GPX4 Gene - Glutathione Peroxidase 4

GPX4 Gene - Glutathione Peroxidase 4

Introduction

Pathway Diagram

```mermaid
flowchart TD
GPX4["GPX4<br/>Glutathione Peroxidase 4"]
SLC7A11["SLC7A11<br/>Cystine/Glutamate<br/>Antiporter"]
AUTOPHAGY["AUTOPHAGY<br/>Cellular Degradation<br/>Pathway"]
FERROPTOSIS["FERROPTOSIS<br/>Iron-dependent<br/>Cell Death"]
REDOX_HOMEOSTASIS["REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance"]
LIPID_PEROXIDATION["LIPID PEROXIDATION<br/>Membrane Damage"]
ALZHEIMER["Alzheimer's Disease<br/>Neurodegeneration"]
ALS["Amyotrophic Lateral<br/>Sclerosis"]
MS["Multiple Sclerosis<br/>Demyelination"]
DEMENTIA["Dementia<br/>Cognitive Decline"]
ISCHEMIA["Cerebral Ischemia<br/>Stroke"]
NEURONAL_DEATH["NEURONAL DEATH<br/>Cell Loss"]
GSH["Glutathione<br/>Antioxidant"]
IRON_METABOLISM["Iron Metabolism<br/>Dysregulation"]

SLC7A11 -->|"regulates"| GPX4
GSH -->|"cofactor"| GPX4
GPX4 -->|"inhibits"| FERROPTOSIS
GPX4 -->|"maintains"| REDOX_HOMEOSTASIS
GPX4 -->|"prevents"| LIPID_PEROXIDATION
AUTOPHAGY -->|"degrades"| GPX4
IRON_METABOLISM -->|"promotes"| FERROPTOSIS
FERROPTOSIS -->|"causes"| NEURONAL_DEATH
LIPID_PEROXIDATION -->|"triggers"| FERROPTOSIS
NEURONAL_DEATH -->|"leads_to"| ALZHEIMER
NEURONAL_DEATH -->|"leads_to"| ALS
NEURONAL_DEATH -->|"leads_to"| MS
NEURONAL_DEATH -->|"leads_to"| DEMENTIA
ISCHEMIA -->|"activates"| FERROPTOSIS
GPX4 -->|"therapeutic_target"| ALS
GPX4 -->|"therapeutic_target"| MS

GPX4 Gene - Glutathione Peroxidase 4

Introduction

Pathway Diagram

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.

<div class="infobox infobox-gene"> [@selenium]
<table> [@ferroptosis]
<tr><th colspan="2" style="background:#f0f0f0;">GPX4</th></tr> [@lipid]
<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]
<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>
<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>
<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>
<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>
<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>
</table>
</div>

Overview

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.

Molecular Function

Enzymatic Activity

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

Unique Substrate Specificity

What distinguishes GPX4 from other glutathione peroxidases:

Expression Pattern

Brain Expression

GPX4 is expressed in various neural cell types:

• [Neurons](/entities/neurons): High expression, especially in pyramidal neurons of cortex and hippocampus
• [Astrocytes](/entities/astrocytes): Moderate expression, supports antioxidant defense
• Oligodendrocytes: Critical for myelin protection (high lipid content)
• [Microglia](/entities/microglia): Expression in activated states

Regional Distribution

• [Hippocampus](/brain-regions/hippocampus): High expression in CA1-CA3 pyramidal neurons
• [Cortex](/brain-regions/cortex): Moderate to high expression in cortical layers
• Cerebellum: Purkinje cells show high expression
• Substantia Nigra: Dopaminergic neurons express GPX4

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

• GPX4 activity is reduced in ALS motor neurons
• [Ferroptosis](/entities/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

Parkinson's Disease

• 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

Alzheimer's Disease

• [Aβ](/proteins/amyloid-beta) 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

Epilepsy

• GPX4 deficiency increases seizure susceptibility
• Ferroptosis may contribute to seizure-induced neuronal damage

Therapeutic Targeting

GPX4 Activators

| Compound | Mechanism | Stage | Notes |
|----------|-----------|-------|-------|
| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |
| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |
| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |
| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |

Indirect Modulators

| Strategy | Approach | Status |
|----------|----------|--------|
| GSH precursors | N-acetylcysteine | Clinical trials |
| Iron chelation | Deferoxamine | Approved |
| Vitamin E | Lipid antioxidant | Supplements |

Genetic Variants

• Selenocysteine variants: Affect enzyme activity
• Polymorphisms: Associated with disease risk
• Knockout models: Embryonic lethal in mice (essential gene)

Research Directions

• Develop small molecule GPX4 activators
• Understand cell-type specific GPX4 regulation
• Explore gene therapy approaches
• Identify ferroptosis biomarkers

Key Publications

Background

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.

See Also

• [Ferroptosis Pathway](/entities/ferroptosis)
• [SLC7A11 Gene](/genes/slc7a11)
• [Oxidative Stress Pathway](/mechanisms/oxidative-stress)
• [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)
• [Parkinson's Disease Genes](/content/genes)
• [Alzheimer's Disease Genes](/content/genes)

External Links

• [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)
• [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)
• [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)
• [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)

References

Related Hypotheses

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

• [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style="color:#ffd54f;font-weight:600">0.54</span> · Target: GPX4/SLC7A11

Pathway Diagram

The following diagram shows the key molecular relationships involving GPX4 Gene - Glutathione Peroxidase 4 discovered through SciDEX knowledge graph analysis: