Version history

{
  "content_md": "# GPX4 Gene - Glutathione Peroxidase 4\n\n## Introduction\n\n\n## Pathway Diagram\n\n```mermaid\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 --|\"regulates\"|--> GPX4\n    GSH --|\"cofactor\"|--> GPX4\n    GPX4 --|\"inhibits\"|--> FERROPTOSIS\n    GPX4 --|\"maintains\"|--> REDOX_HOMEOSTASIS\n    GPX4 --|\"prevents\"|--> LIPID_PEROXIDATION\n    AUTOPHAGY --|\"degrades\"|--> GPX4\n    IRON_METABOLISM --|\"promotes\"|--> FERROPTOSIS\n    FERROPTOSIS --|\"causes\"|--> NEURONAL_DEATH\n    LIPID_PEROXIDATION --|\"triggers\"|--> FERROPTOSIS\n    NEURONAL_DEATH --|\"leads_to\"|--> ALZHEIMER\n    NEURONAL_DEATH --|\"leads_to\"|--> ALS\n    NEURONAL_DEATH --|\"leads_to\"|--> MS\n    NEURONAL_DEATH --|\"leads_to\"|--> DEMENTIA\n    ISCHEMIA --|\"activates\"|--> FERROPTOSIS\n    GPX4 --|\"therapeutic_target\"|--> ALS\n    GPX4 --|\"therapeutic_target\"|--> MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n```\n\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n\n## Pathway Diagram\n\nThe following diagram shows the key molecular relationships involving GPX4 Gene - Glutathione Peroxidase 4 discovered through SciDEX knowledge graph analysis:\n\n```mermaid\ngraph TD\n    SLC7A11[\"SLC7A11\"] -->|\"activates\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    TMEM16F[\"TMEM16F\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -->|\"targets\"| GPX4[\"GPX4\"]\n    NRF2[\"NRF2\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    copper[\"copper\"] -->|\"binds to\"| GPX4[\"GPX4\"]\n    HNRNPA2B1[\"HNRNPA2B1\"] -->|\"associated with\"| GPX4[\"GPX4\"]\n    Emodin[\"Emodin\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    Lactoferrin[\"Lactoferrin\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    TAX1BP1[\"TAX1BP1\"] -->|\"modulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    Rotenone[\"Rotenone\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    HSP90[\"HSP90\"] -->|\"interacts with\"| GPX4[\"GPX4\"]\n    autophagy[\"autophagy\"] -->|\"degrades\"| GPX4[\"GPX4\"]\n    style SLC7A11 fill:#ce93d8,stroke:#333,color:#000\n    style GPX4 fill:#4fc3f7,stroke:#333,color:#000\n    style TMEM16F fill:#ce93d8,stroke:#333,color:#000\n    style STING fill:#4fc3f7,stroke:#333,color:#000\n    style NRF2 fill:#4fc3f7,stroke:#333,color:#000\n    style copper fill:#ff8a65,stroke:#333,color:#000\n    style HNRNPA2B1 fill:#4fc3f7,stroke:#333,color:#000\n    style Emodin fill:#ff8a65,stroke:#333,color:#000\n    style Lactoferrin fill:#4fc3f7,stroke:#333,color:#000\n    style TAX1BP1 fill:#4fc3f7,stroke:#333,color:#000\n    style Rotenone fill:#ff8a65,stroke:#333,color:#000\n    style HSP90 fill:#4fc3f7,stroke:#333,color:#000\n    style autophagy fill:#4fc3f7,stroke:#333,color:#000\n```\n\n",
  "entity_type": "gene"
}

{
  "content_md": "# GPX4 Gene - Glutathione Peroxidase 4\n\n## Introduction\n\n\n## Pathway Diagram\n\n```mermaid\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 -->|\"regulates\"| GPX4\n    GSH -->|\"cofactor\"| GPX4\n    GPX4 -->|\"inhibits\"| FERROPTOSIS\n    GPX4 -->|\"maintains\"| REDOX_HOMEOSTASIS\n    GPX4 -->|\"prevents\"| LIPID_PEROXIDATION\n    AUTOPHAGY -->|\"degrades\"| GPX4\n    IRON_METABOLISM -->|\"promotes\"| FERROPTOSIS\n    FERROPTOSIS -->|\"causes\"| NEURONAL_DEATH\n    LIPID_PEROXIDATION -->|\"triggers\"| FERROPTOSIS\n    NEURONAL_DEATH -->|\"leads_to\"| ALZHEIMER\n    NEURONAL_DEATH -->|\"leads_to\"| ALS\n    NEURONAL_DEATH -->|\"leads_to\"| MS\n    NEURONAL_DEATH -->|\"leads_to\"| DEMENTIA\n    ISCHEMIA -->|\"activates\"| FERROPTOSIS\n    GPX4 -->|\"therapeutic_target\"| ALS\n    GPX4 -->|\"therapeutic_target\"| MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n```\n\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n\n## Pathway Diagram\n\nThe following diagram shows the key molecular relationships involving GPX4 Gene - Glutathione Peroxidase 4 discovered through SciDEX knowledge graph analysis:\n\n```mermaid\ngraph TD\n    SLC7A11[\"SLC7A11\"] -->|\"activates\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    TMEM16F[\"TMEM16F\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -->|\"targets\"| GPX4[\"GPX4\"]\n    NRF2[\"NRF2\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    copper[\"copper\"] -->|\"binds to\"| GPX4[\"GPX4\"]\n    HNRNPA2B1[\"HNRNPA2B1\"] -->|\"associated with\"| GPX4[\"GPX4\"]\n    Emodin[\"Emodin\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    Lactoferrin[\"Lactoferrin\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    TAX1BP1[\"TAX1BP1\"] -->|\"modulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    Rotenone[\"Rotenone\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    HSP90[\"HSP90\"] -->|\"interacts with\"| GPX4[\"GPX4\"]\n    autophagy[\"autophagy\"] -->|\"degrades\"| GPX4[\"GPX4\"]\n    style SLC7A11 fill:#ce93d8,stroke:#333,color:#000\n    style GPX4 fill:#4fc3f7,stroke:#333,color:#000\n    style TMEM16F fill:#ce93d8,stroke:#333,color:#000\n    style STING fill:#4fc3f7,stroke:#333,color:#000\n    style NRF2 fill:#4fc3f7,stroke:#333,color:#000\n    style copper fill:#ff8a65,stroke:#333,color:#000\n    style HNRNPA2B1 fill:#4fc3f7,stroke:#333,color:#000\n    style Emodin fill:#ff8a65,stroke:#333,color:#000\n    style Lactoferrin fill:#4fc3f7,stroke:#333,color:#000\n    style TAX1BP1 fill:#4fc3f7,stroke:#333,color:#000\n    style Rotenone fill:#ff8a65,stroke:#333,color:#000\n    style HSP90 fill:#4fc3f7,stroke:#333,color:#000\n    style autophagy fill:#4fc3f7,stroke:#333,color:#000\n```\n\n",
  "entity_type": "gene"
}

{
  "content_md": "# GPX4 Gene - Glutathione Peroxidase 4\n\n## Introduction\n\n\n## Pathway Diagram\n\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 --|\"regulates\"|--> GPX4\n    GSH --|\"cofactor\"|--> GPX4\n    GPX4 --|\"inhibits\"|--> FERROPTOSIS\n    GPX4 --|\"maintains\"|--> REDOX_HOMEOSTASIS\n    GPX4 --|\"prevents\"|--> LIPID_PEROXIDATION\n    AUTOPHAGY --|\"degrades\"|--> GPX4\n    IRON_METABOLISM --|\"promotes\"|--> FERROPTOSIS\n    FERROPTOSIS --|\"causes\"|--> NEURONAL_DEATH\n    LIPID_PEROXIDATION --|\"triggers\"|--> FERROPTOSIS\n    NEURONAL_DEATH --|\"leads_to\"|--> ALZHEIMER\n    NEURONAL_DEATH --|\"leads_to\"|--> ALS\n    NEURONAL_DEATH --|\"leads_to\"|--> MS\n    NEURONAL_DEATH --|\"leads_to\"|--> DEMENTIA\n    ISCHEMIA --|\"activates\"|--> FERROPTOSIS\n    GPX4 --|\"therapeutic_target\"|--> ALS\n    GPX4 --|\"therapeutic_target\"|--> MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n\n## Pathway Diagram\n\nThe following diagram shows the key molecular relationships involving GPX4 Gene - Glutathione Peroxidase 4 discovered through SciDEX knowledge graph analysis:\n\n```mermaid\ngraph TD\n    SLC7A11[\"SLC7A11\"] -->|\"activates\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    TMEM16F[\"TMEM16F\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -->|\"targets\"| GPX4[\"GPX4\"]\n    NRF2[\"NRF2\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    copper[\"copper\"] -->|\"binds to\"| GPX4[\"GPX4\"]\n    HNRNPA2B1[\"HNRNPA2B1\"] -->|\"associated with\"| GPX4[\"GPX4\"]\n    Emodin[\"Emodin\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    Lactoferrin[\"Lactoferrin\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    TAX1BP1[\"TAX1BP1\"] -->|\"modulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    Rotenone[\"Rotenone\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    HSP90[\"HSP90\"] -->|\"interacts with\"| GPX4[\"GPX4\"]\n    autophagy[\"autophagy\"] -->|\"degrades\"| GPX4[\"GPX4\"]\n    style SLC7A11 fill:#ce93d8,stroke:#333,color:#000\n    style GPX4 fill:#4fc3f7,stroke:#333,color:#000\n    style TMEM16F fill:#ce93d8,stroke:#333,color:#000\n    style STING fill:#4fc3f7,stroke:#333,color:#000\n    style NRF2 fill:#4fc3f7,stroke:#333,color:#000\n    style copper fill:#ff8a65,stroke:#333,color:#000\n    style HNRNPA2B1 fill:#4fc3f7,stroke:#333,color:#000\n    style Emodin fill:#ff8a65,stroke:#333,color:#000\n    style Lactoferrin fill:#4fc3f7,stroke:#333,color:#000\n    style TAX1BP1 fill:#4fc3f7,stroke:#333,color:#000\n    style Rotenone fill:#ff8a65,stroke:#333,color:#000\n    style HSP90 fill:#4fc3f7,stroke:#333,color:#000\n    style autophagy fill:#4fc3f7,stroke:#333,color:#000\n```\n\n",
  "entity_type": "gene"
}

{
  "content_md": "# GPX4 Gene - Glutathione Peroxidase 4\n\n## Introduction\n\n\n## Pathway Diagram\n\n```mermaid\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 --|\"regulates\"|--> GPX4\n    GSH --|\"cofactor\"|--> GPX4\n    GPX4 --|\"inhibits\"|--> FERROPTOSIS\n    GPX4 --|\"maintains\"|--> REDOX_HOMEOSTASIS\n    GPX4 --|\"prevents\"|--> LIPID_PEROXIDATION\n    AUTOPHAGY --|\"degrades\"|--> GPX4\n    IRON_METABOLISM --|\"promotes\"|--> FERROPTOSIS\n    FERROPTOSIS --|\"causes\"|--> NEURONAL_DEATH\n    LIPID_PEROXIDATION --|\"triggers\"|--> FERROPTOSIS\n    NEURONAL_DEATH --|\"leads_to\"|--> ALZHEIMER\n    NEURONAL_DEATH --|\"leads_to\"|--> ALS\n    NEURONAL_DEATH --|\"leads_to\"|--> MS\n    NEURONAL_DEATH --|\"leads_to\"|--> DEMENTIA\n    ISCHEMIA --|\"activates\"|--> FERROPTOSIS\n    GPX4 --|\"therapeutic_target\"|--> ALS\n    GPX4 --|\"therapeutic_target\"|--> MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n```\n\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n\n## Pathway Diagram\n\nThe following diagram shows the key molecular relationships involving GPX4 Gene - Glutathione Peroxidase 4 discovered through SciDEX knowledge graph analysis:\n\n```mermaid\ngraph TD\n    SLC7A11[\"SLC7A11\"] -->|\"activates\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    SLC7A11[\"SLC7A11\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    TMEM16F[\"TMEM16F\"] -->|\"regulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -->|\"targets\"| GPX4[\"GPX4\"]\n    NRF2[\"NRF2\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    copper[\"copper\"] -->|\"binds to\"| GPX4[\"GPX4\"]\n    HNRNPA2B1[\"HNRNPA2B1\"] -->|\"associated with\"| GPX4[\"GPX4\"]\n    Emodin[\"Emodin\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    Lactoferrin[\"Lactoferrin\"] -->|\"upregulates\"| GPX4[\"GPX4\"]\n    TAX1BP1[\"TAX1BP1\"] -->|\"modulates\"| GPX4[\"GPX4\"]\n    STING[\"STING\"] -.->|\"inhibits\"| GPX4[\"GPX4\"]\n    Rotenone[\"Rotenone\"] -.->|\"downregulates\"| GPX4[\"GPX4\"]\n    HSP90[\"HSP90\"] -->|\"interacts with\"| GPX4[\"GPX4\"]\n    autophagy[\"autophagy\"] -->|\"degrades\"| GPX4[\"GPX4\"]\n    style SLC7A11 fill:#ce93d8,stroke:#333,color:#000\n    style GPX4 fill:#4fc3f7,stroke:#333,color:#000\n    style TMEM16F fill:#ce93d8,stroke:#333,color:#000\n    style STING fill:#4fc3f7,stroke:#333,color:#000\n    style NRF2 fill:#4fc3f7,stroke:#333,color:#000\n    style copper fill:#ff8a65,stroke:#333,color:#000\n    style HNRNPA2B1 fill:#4fc3f7,stroke:#333,color:#000\n    style Emodin fill:#ff8a65,stroke:#333,color:#000\n    style Lactoferrin fill:#4fc3f7,stroke:#333,color:#000\n    style TAX1BP1 fill:#4fc3f7,stroke:#333,color:#000\n    style Rotenone fill:#ff8a65,stroke:#333,color:#000\n    style HSP90 fill:#4fc3f7,stroke:#333,color:#000\n    style autophagy fill:#4fc3f7,stroke:#333,color:#000\n```\n\n",
  "entity_type": "gene"
}

{
  "content_md": "# GPX4 Gene - Glutathione Peroxidase 4\n\n## Introduction\n\n\n## Pathway Diagram\n\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 --|\"regulates\"|--> GPX4\n    GSH --|\"cofactor\"|--> GPX4\n    GPX4 --|\"inhibits\"|--> FERROPTOSIS\n    GPX4 --|\"maintains\"|--> REDOX_HOMEOSTASIS\n    GPX4 --|\"prevents\"|--> LIPID_PEROXIDATION\n    AUTOPHAGY --|\"degrades\"|--> GPX4\n    IRON_METABOLISM --|\"promotes\"|--> FERROPTOSIS\n    FERROPTOSIS --|\"causes\"|--> NEURONAL_DEATH\n    LIPID_PEROXIDATION --|\"triggers\"|--> FERROPTOSIS\n    NEURONAL_DEATH --|\"leads_to\"|--> ALZHEIMER\n    NEURONAL_DEATH --|\"leads_to\"|--> ALS\n    NEURONAL_DEATH --|\"leads_to\"|--> MS\n    NEURONAL_DEATH --|\"leads_to\"|--> DEMENTIA\n    ISCHEMIA --|\"activates\"|--> FERROPTOSIS\n    GPX4 --|\"therapeutic_target\"|--> ALS\n    GPX4 --|\"therapeutic_target\"|--> MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n",
  "entity_type": "gene"
}

{
  "content_md": "# GPX4 Gene - Glutathione Peroxidase 4\n\n## Introduction\n\n\n## Pathway Diagram\n\n```mermaid\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 --|\"regulates\"|--> GPX4\n    GSH --|\"cofactor\"|--> GPX4\n    GPX4 --|\"inhibits\"|--> FERROPTOSIS\n    GPX4 --|\"maintains\"|--> REDOX_HOMEOSTASIS\n    GPX4 --|\"prevents\"|--> LIPID_PEROXIDATION\n    AUTOPHAGY --|\"degrades\"|--> GPX4\n    IRON_METABOLISM --|\"promotes\"|--> FERROPTOSIS\n    FERROPTOSIS --|\"causes\"|--> NEURONAL_DEATH\n    LIPID_PEROXIDATION --|\"triggers\"|--> FERROPTOSIS\n    NEURONAL_DEATH --|\"leads_to\"|--> ALZHEIMER\n    NEURONAL_DEATH --|\"leads_to\"|--> ALS\n    NEURONAL_DEATH --|\"leads_to\"|--> MS\n    NEURONAL_DEATH --|\"leads_to\"|--> DEMENTIA\n    ISCHEMIA --|\"activates\"|--> FERROPTOSIS\n    GPX4 --|\"therapeutic_target\"|--> ALS\n    GPX4 --|\"therapeutic_target\"|--> MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n\n```\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n",
  "entity_type": "gene"
}

{
  "content_md": "# GPX4 Gene - Glutathione Peroxidase 4\n\n## Introduction\n\n\n## Pathway Diagram\n\n```mermaid\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 --|regulates|--> GPX4\n    GSH --|cofactor|--> GPX4\n    GPX4 --|inhibits|--> FERROPTOSIS\n    GPX4 --|maintains|--> REDOX_HOMEOSTASIS\n    GPX4 --|prevents|--> LIPID_PEROXIDATION\n    AUTOPHAGY --|degrades|--> GPX4\n    IRON_METABOLISM --|promotes|--> FERROPTOSIS\n    FERROPTOSIS --|causes|--> NEURONAL_DEATH\n    LIPID_PEROXIDATION --|triggers|--> FERROPTOSIS\n    NEURONAL_DEATH --|leads_to|--> ALZHEIMER\n    NEURONAL_DEATH --|leads_to|--> ALS\n    NEURONAL_DEATH --|leads_to|--> MS\n    NEURONAL_DEATH --|leads_to|--> DEMENTIA\n    ISCHEMIA --|activates|--> FERROPTOSIS\n    GPX4 --|therapeutic_target|--> ALS\n    GPX4 --|therapeutic_target|--> MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n```\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n",
  "entity_type": "gene"
}

{
  "content_md": "## Introduction\n\n\n## Pathway Diagram\n\n```mermaid\nflowchart TD\n    GPX4[\"GPX4<br/>Glutathione Peroxidase 4\"]\n    SLC7A11[\"SLC7A11<br/>Cystine/Glutamate<br/>Antiporter\"]\n    AUTOPHAGY[\"AUTOPHAGY<br/>Cellular Degradation<br/>Pathway\"]\n    FERROPTOSIS[\"FERROPTOSIS<br/>Iron-dependent<br/>Cell Death\"]\n    REDOX_HOMEOSTASIS[\"REDOX HOMEOSTASIS<br/>Cellular Antioxidant<br/>Balance\"]\n    LIPID_PEROXIDATION[\"LIPID PEROXIDATION<br/>Membrane Damage\"]\n    ALZHEIMER[\"Alzheimer's Disease<br/>Neurodegeneration\"]\n    ALS[\"Amyotrophic Lateral<br/>Sclerosis\"]\n    MS[\"Multiple Sclerosis<br/>Demyelination\"]\n    DEMENTIA[\"Dementia<br/>Cognitive Decline\"]\n    ISCHEMIA[\"Cerebral Ischemia<br/>Stroke\"]\n    NEURONAL_DEATH[\"NEURONAL DEATH<br/>Cell Loss\"]\n    GSH[\"Glutathione<br/>Antioxidant\"]\n    IRON_METABOLISM[\"Iron Metabolism<br/>Dysregulation\"]\n\n    SLC7A11 --|regulates|--> GPX4\n    GSH --|cofactor|--> GPX4\n    GPX4 --|inhibits|--> FERROPTOSIS\n    GPX4 --|maintains|--> REDOX_HOMEOSTASIS\n    GPX4 --|prevents|--> LIPID_PEROXIDATION\n    AUTOPHAGY --|degrades|--> GPX4\n    IRON_METABOLISM --|promotes|--> FERROPTOSIS\n    FERROPTOSIS --|causes|--> NEURONAL_DEATH\n    LIPID_PEROXIDATION --|triggers|--> FERROPTOSIS\n    NEURONAL_DEATH --|leads_to|--> ALZHEIMER\n    NEURONAL_DEATH --|leads_to|--> ALS\n    NEURONAL_DEATH --|leads_to|--> MS\n    NEURONAL_DEATH --|leads_to|--> DEMENTIA\n    ISCHEMIA --|activates|--> FERROPTOSIS\n    GPX4 --|therapeutic_target|--> ALS\n    GPX4 --|therapeutic_target|--> MS\n\n    style GPX4 fill:#006494\n    style SLC7A11 fill:#4a1a6b\n    style GSH fill:#1b5e20\n    style REDOX_HOMEOSTASIS fill:#1b5e20\n    style FERROPTOSIS fill:#ef5350\n    style LIPID_PEROXIDATION fill:#ef5350\n    style NEURONAL_DEATH fill:#ef5350\n    style ALZHEIMER fill:#5d4400\n    style ALS fill:#5d4400\n    style MS fill:#5d4400\n    style DEMENTIA fill:#5d4400\n    style ISCHEMIA fill:#5d4400\n    style AUTOPHAGY fill:#4a1a6b\n    style IRON_METABOLISM fill:#4a1a6b\n```\n\n\nGpx4 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.\n\n<div class=\"infobox infobox-gene\"> [@selenium]\n<table> [@ferroptosis]\n<tr><th colspan=\"2\" style=\"background:#f0f0f0;\">GPX4</th></tr> [@lipid]\n<tr><td><b>Gene Symbol</b></td><td>GPX4</td></tr> [@gpxa]\n<tr><td><b>Full Name</b></td><td>Glutathione Peroxidase 4</td></tr>\n<tr><td><b>Chromosomal Location</b></td><td>19p13.3</td></tr>\n<tr><td><b>NCBI Gene ID</b></td><td>[2879](https://www.ncbi.nlm.nih.gov/gene/2879)</td></tr>\n<tr><td><b>OMIM</b></td><td>[138320](https://www.omim.org/entry/138320)</td></tr>\n<tr><td><b>Ensembl ID</b></td><td>ENSG00000167468</td></tr>\n<tr><td><b>UniProt ID</b></td><td>[P36969](https://www.uniprot.org/uniprot/P36969)</td></tr>\n<tr><td><b>Protein</b></td><td>Glutathione Peroxidase 4 (GPX4)</td></tr>\n<tr><td><b>Associated Diseases</b></td><td>Amyotrophic Lateral Sclerosis (ALS), Parkinson's Disease, Alzheimer's Disease, Ferroptosis-related disorders</td></tr>\n</table>\n</div>\n\n## Overview\n\n**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.\n\n## Molecular Function\n\n### Enzymatic Activity\n\nGPX4 catalyzes the reduction of lipid hydroperoxides using glutathione (GSH):\n\n- **Substrates**: Phospholipid hydroperoxides (PLOOH), cholesterol hydroperoxides, lipid peroxides\n- **Co-substrate**: Glutathione (two molecules per reaction)\n- **Products**: Corresponding alcohols, oxidized glutathione (GSSG)\n- **Selenocysteine**: Contains a selenocysteine at the active site, conferring high catalytic efficiency\n\n### Unique Substrate Specificity\n\nWhat distinguishes GPX4 from other glutathione peroxidases:\n\n1. Reduces lipid peroxides in membranes and lipoproteins\n2. Works directly on phospholipid bilayers\n3. Prevents ferroptotic cell death\n4. Essential for survival of cells with high lipid content (neurons)\n\n## Expression Pattern\n\n### Brain Expression\n\nGPX4 is expressed in various neural cell types:\n\n- **[Neurons](/entities/neurons)**: High expression, especially in pyramidal neurons of cortex and hippocampus\n- **[Astrocytes](/entities/astrocytes)**: Moderate expression, supports antioxidant defense\n- **Oligodendrocytes**: Critical for myelin protection (high lipid content)\n- **[Microglia](/entities/microglia)**: Expression in activated states\n\n### Regional Distribution\n\n- **[Hippocampus](/brain-regions/hippocampus)**: High expression in CA1-CA3 pyramidal neurons\n- **[Cortex](/brain-regions/cortex)**: Moderate to high expression in cortical layers\n- **Cerebellum**: Purkinje cells show high expression\n- **Substantia Nigra**: Dopaminergic neurons express GPX4\n\n## Disease Associations\n\n### Amyotrophic Lateral Sclerosis (ALS)\n\n- GPX4 activity is reduced in ALS motor neurons\n- [Ferroptosis](/entities/ferroptosis) is implicated as a cell death mechanism\n- Lipid peroxidation markers are elevated in ALS patients\n- GPX4 overexpression protects motor neurons in models\n- Selenoproteins are dysregulated in ALS\n\n### Parkinson's Disease\n\n- GPX4 expression is decreased in substantia nigra\n- Lipid peroxidation is a hallmark of PD\n- Iron accumulation in PD brains promotes ferroptosis\n- Enhancing GPX4 may protect dopaminergic neurons\n\n### Alzheimer's Disease\n\n- [Aβ](/proteins/amyloid-beta) induces lipid peroxidation in neurons\n- GPX4 activity declines with age and in AD\n- Ferroptosis may contribute to neuronal loss\n- Therapeutic strategies aim to boost GPX4\n\n### Epilepsy\n\n- GPX4 deficiency increases seizure susceptibility\n- Ferroptosis may contribute to seizure-induced neuronal damage\n\n## Therapeutic Targeting\n\n### GPX4 Activators\n\n| Compound | Mechanism | Stage | Notes |\n|----------|-----------|-------|-------|\n| Selenium | Selenocysteine incorporation | Clinical | Essential cofactor |\n| Selenomethionine | Selenoprotein synthesis | Supplements | Precursor |\n| Ferrostatin-1 | Lipid [ROS](/entities/reactive-oxygen-species) scavenger | Research | Ferroptosis inhibitor |\n| Liproxstatin-1 | GPX4 pathway stabilizer | Research | In vivo efficacy |\n\n### Indirect Modulators\n\n| Strategy | Approach | Status |\n|----------|----------|--------|\n| GSH precursors | N-acetylcysteine | Clinical trials |\n| Iron chelation | Deferoxamine | Approved |\n| Vitamin E | Lipid antioxidant | Supplements |\n\n## Genetic Variants\n\n- **Selenocysteine variants**: Affect enzyme activity\n- **Polymorphisms**: Associated with disease risk\n- **Knockout models**: Embryonic lethal in mice (essential gene)\n\n## Research Directions\n\n- Develop small molecule GPX4 activators\n- Understand cell-type specific GPX4 regulation\n- Explore gene therapy approaches\n- Identify ferroptosis biomarkers\n\n## Key Publications\n\n## Background\n\nThe 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.\n\nHistorical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.\n\n## See Also\n\n- [Ferroptosis Pathway](/entities/ferroptosis)\n- [SLC7A11 Gene](/genes/slc7a11)\n- [Oxidative Stress Pathway](/mechanisms/oxidative-stress)\n- [ALS Gene List](/diseases/amyotrophic-lateral-sclerosis)\n- [Parkinson's Disease Genes](/content/genes)\n- [Alzheimer's Disease Genes](/content/genes)\n\n## External Links\n\n- [NCBI Gene: GPX4](https://www.ncbi.nlm.nih.gov/gene/2879)\n- [UniProt: P36969](https://www.uniprot.org/uniprot/P36969)\n- [Ensembl: ENSG00000167468](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167468)\n- [GeneCards: GPX4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GPX4)\n\n## References\n\n1. [Unknown, *GPX4 and ferroptosis in neurodegeneration*. Nature Reviews Neurology (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n2. [Unknown, *Selenium and selenoproteins in brain health*. Free Radical Biology and Medicine (n.d.)]([PMID:28799612](https://pubmed.ncbi.nlm.nih.gov/28799612/))\n3. [Unknown, *Ferroptosis: A regulated necrosis driven by lipid peroxidation*. Nature Reviews Drug Discovery (n.d.)]([PMID:32877946](https://pubmed.ncbi.nlm.nih.gov/32877946/))\n4. [Unknown, *Lipid peroxidation in ALS: Role of GPX4*. Annals of Neurology (n.d.)]([PMID:32472567](https://pubmed.ncbi.nlm.nih.gov/32472567/))\n5. [Unknown, *GPX4 overexpression protects against neurodegeneration*. Cell (n.d.)]([PMID:28065621](https://pubmed.ncbi.nlm.nih.gov/28065621/))\n\n## Related Hypotheses\n\n*From the [SciDEX Exchange](/exchange) — scored by multi-agent debate*\n\n- [Senescence-Induced Lipid Peroxidation Spreading](/hypothesis/h-7957bb2a) — <span style=\"color:#ffd54f;font-weight:600\">0.54</span> · Target: GPX4/SLC7A11\n",
  "entity_type": "gene"
}