TNF Gene, Tumor Necrosis Factor
Introduction
Tnf Tumor Necrosis Factor 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"> [@swardfager2010]
| Attribute | Value | [@swardfager]
|-----------|-------| [@barnum2014]
| Gene Symbol | TNF | [@komine2018]
| Full Name | Tumor Necrosis Factor |
| Chromosomal Location | 6p21.33 |
| NCBI Gene ID | [7124](https://www.ncbi.nlm.nih.gov/gene/7124) |
| Ensembl ID | ENSG00000232890 |
| UniProt ID | [P01375](https://www.uniprot.org/uniprot/P01375) |
| OMIM | [191160](https://www.omim.org/191160) |
| Gene Family | TNF superfamily |
| Protein Class | Cytokine |
</div>}
Overview
The TNF gene encodes Tumor Necrosis Factor (TNF-α), a potent pro-inflammatory cytokine that plays central roles in immune regulation, inflammation, and cell death. TNF is primarily produced by activated macrophages and [microglia](/cell-types/microglia-neuroinflammation), and has profound effects on neuronal survival and function in the central nervous system.
Molecular Function
Signaling Pathways
TNF signals through two receptors:
- TNFR1 (p55): Ubiquitous, death domain
- TNFR2 (p75): Immune cells, tissue-specific
- [NF-κB](/entities/nf-kb) Activation: Pro-inflammatory genes
- Caspase Activation: [Apoptosis](/entities/apoptosis) pathways
Signaling Pathways
TNF activates multiple downstream pathways upon receptor binding:
...TNF Gene, Tumor Necrosis Factor
Introduction
Tnf Tumor Necrosis Factor 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"> [@swardfager2010]
| Attribute | Value | [@swardfager]
|-----------|-------| [@barnum2014]
| Gene Symbol | TNF | [@komine2018]
| Full Name | Tumor Necrosis Factor |
| Chromosomal Location | 6p21.33 |
| NCBI Gene ID | [7124](https://www.ncbi.nlm.nih.gov/gene/7124) |
| Ensembl ID | ENSG00000232890 |
| UniProt ID | [P01375](https://www.uniprot.org/uniprot/P01375) |
| OMIM | [191160](https://www.omim.org/191160) |
| Gene Family | TNF superfamily |
| Protein Class | Cytokine |
</div>}
Overview
The TNF gene encodes Tumor Necrosis Factor (TNF-α), a potent pro-inflammatory cytokine that plays central roles in immune regulation, inflammation, and cell death. TNF is primarily produced by activated macrophages and [microglia](/cell-types/microglia-neuroinflammation), and has profound effects on neuronal survival and function in the central nervous system.
Molecular Function
Signaling Pathways
TNF signals through two receptors:
- TNFR1 (p55): Ubiquitous, death domain
- TNFR2 (p75): Immune cells, tissue-specific
- [NF-κB](/entities/nf-kb) Activation: Pro-inflammatory genes
- Caspase Activation: [Apoptosis](/entities/apoptosis) pathways
Signaling Pathways
TNF activates multiple downstream pathways upon receptor binding:
| Pathway | Key Effectors | Cellular Outcome |
|---------|---------------|------------------|
| NF-κB | IKK, IκB, p65/p50 | Pro-inflammatory gene transcription |
| MAPK | JNK, p38, ERK | Stress response, survival |
| Caspase-8 | Death domain signaling | Apoptosis or necroptosis |
| ERK1/2 | MEK1/2, Elk-1 | Cell proliferation, differentiation |
TNFR1 vs TNFR2 Signaling
| Feature | TNFR1 (p55) | TNFR2 (p75) |
|---------|-------------|-------------|
| Expression | Ubiquitous | Immune cells, endothelial |
| Death domain | Present | Absent |
| Primary signaling | NF-κB, apoptosis | NF-κB, survival |
| Function | Pro-inflammatory | Tissue repair,免疫 regulation |
Downstream Effectors
The TNF signaling network includes:
- Transcription factors: NF-κB, AP-1, STAT3
- Kinases: IKK, MAPKs, PI3K/Akt
- Caspases: Initiator and effector caspases
- Adaptor proteins: TRADD, TRAF2, RIP1, FADD
Biological Activities
| Activity | Mechanism |
|----------|-----------|
| Inflammation | Leukocyte recruitment |
| Cytotoxicity | Apoptosis induction |
| Fever | Hypothalamic effect |
| Cachexia | Metabolic effects |
Expression Pattern
Brain
- [Microglia](/entities/microglia): Primary source in CNS
- [Astrocytes](/entities/astrocytes): Inflammatory activation
- [Neurons](/entities/neurons): Expression under stress
- Endothelial Cells: BBB regulation
Disease Associations
Alzheimer's Disease
- Neuroinflammation: Key mediator
- Amyloid Interaction: Synergistic toxicity
- Therapeutic Target: TNF inhibitors
- Genetic Association: TNF polymorphisms
Parkinson's Disease
- Microglial Activation: Chronic neuroinflammation
- Neuronal Death: Contributes to degeneration
- Therapeutic Potential: Anti-TNF strategies
Multiple Sclerosis
- Demyelination: Inflammatory damage
- Therapeutic Target: Etanercept trials
- [Blood-Brain Barrier](/entities/blood-brain-barrier): Permeability effects
Stroke
- Ischemic Injury: Exacerbates damage
- Therapeutic Window: TNF modulation
Therapeutic Implications
Approved Drugs
| Drug | Type | Indication |
|------|------|------------|
| Etanercept | TNF receptor-Fc fusion | RA, psoriasis |
| Infliximab | Anti-TNF antibody | IBD, RA |
| Adalimumab | Anti-TNF antibody | Autoimmune |
CNS Applications
- Blood-Brain Barrier: Challenge for delivery
- Peripheral Targeting: Indirect CNS effects
- Research: PET ligands for TNF imaging
Key Publications
- PMID: 11585629(https://pubmed.ncbi.nlm.nih.gov/11585629/) - TNF in neurodegeneration
- PMID: 14583152(https://pubmed.ncbi.nlm.nih.gov/14583152/) - TNF in Alzheimer's disease
Background
The study of Tnf Tumor Necrosis Factor 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
- [Proteins Index](/proteins)
- [TNF-alpha Protein](/proteins/tnf-alpha-protein)
- [Neuroinflammation](/mechanisms/neuroinflammation-pathway)
External Links
- [NCBI Gene TNF](https://www.ncbi.nlm.nih.gov/gene/7124)
- [UniProt P01375](https://www.uniprot.org/uniprot/P01375)
- [OMIM 191160](https://www.omim.org/191160)
TNF Signaling Pathways
TNF exerts its effects through two distinct receptors:
TNFR1 (p55/p60)
- Expressed ubiquitously in most tissues
- [Activates NF-κB, MAPK, and caspase-8 pathways](/institutions/cas)
- [Mediates both pro-survival and pro-apoptotic signaling](/genes/th)
- [Contains death domain for apoptosis induction](/genes/th)
TNFR2 (p75/p80)
- [Expressed primarily in immune cells and endothelial cells](/cell-types/endothelial-cells)
- [Activates NF-κB and MAPK pathways](/genes/th)
- [Predominantly pro-survival signaling](/genes/gnal)
- [Limited to certain cell types including microglia](/projects/cell-types)
TNF in Neuroinflammation
TNF plays a central role in neuroinflammatory processes:
Microglial Activation
- [TNF released by activated microglia creat](/cell-types/microglia)es a feedback loop
- Promotes release of other cytokines (IL-1β, IL-6)
- Enhances antigen presentation and phagocytosis
- Can shift microglial phenotype between M1 and M2 states
Blood-Brain Barrier Permeability
- TNF increases BBB permeability through endothelial activation
- Promotes leukocyte infiltration into CNS
- Upregulates adhesion molecules (ICAM-1, VCAM-1)
- Therapeutic target for neuroinflammatory conditions
TNF in Specific Neurodegenerative Diseases
Alzheimer's Disease
- Elevated TNF levels in AD brains and CSF
- Aβ oligomers induce TNF production in microglia
- TNF promotes tau phosphorylation and aggregation
- Anti-TNF therapies being investigated
Parkinson's Disease
- Increased TNF in substantia nigra of PD patients
- Dopaminergic neurons show heightened TNF sensitivity
- TNF contributes to neuroinflammation in PD
- TNF blockade may provide neuroprotection
Amyotrophic Lateral Sclerosis (ALS)
- Elevated TNF in ALS patients and mouse models
- Mutant SOD1 astrocytes promote TNF release
- Contributes to motor neuron death
- Anti-TNF strategies in preclinical testing
Multiple Sclerosis
- TNF crucial for demyelination and lesion formation
- TNF-blocking antibodies (infliximab, etanercept) tested
- Paradoxical effects noted in some patients
- TNF still a therapeutic target
Therapeutic Targeting
TNF Inhibitors
| Drug | Type | Status | Notes |
|------|------|--------|-------|
| Etanercept | Fusion protein | Clinical trials | Failed in AD |
| Infliximab | Antibody | Clinical trials | Mixed results |
| Adalimumab | Antibody | Clinical trials | Tested in MS |
| Thalidomide | Small molecule | Preclinical | Anti-TNF activity |
Challenges
- TNF has both beneficial and harmful effects
- Peripheral vs CNS targeting issue
- Blood-brain barrier penetration
- Timing of intervention critical
Animal Models
Transgenic and knockout mouse models have been instrumental:
- TNF knockout mice show reduced neuroinflammation
- TNFR1 knockout protective in some models
- Neuron-specific TNF overexpression causes degeneration
- Astrocyte-specific TNF drives demyelination
Biomarkers
TNF and its receptors serve as biomarkers:
- CSF TNF elevated in AD, PD, MS
- Soluble TNFR2 correlates with disease progression
- Therapeutic monitoring of TNF blockade
Allen Brain Atlas Data
Gene Expression
TNF (Tumor Necrosis Factor) expression patterns:
- Hippocampus - High expression in CA1 pyramidal neurons
- Cerebral cortex - Layer 5 pyramidal neurons
- Substantia nigra - Moderate expression in dopaminergic neurons
- Hypothalamus - High expression (key site for TNF signaling)
Single-Cell Expression
TNF is expressed in:
- Microglia (high levels - primary source of TNF in brain)
- Astrocytes (reactive astrocytes in neuroinflammation)
- Certain neuronal populations
- Endothelial cells
Brain Region Expression Levels
| Region | Expression Level | Data Source |
|--------|-----------------|--------------|
| Hippocampus | High | Mouse Brain |
| Cortex | High | Mouse Brain |
| Hypothalamus | High | Human MTG |
| Substantia nigra | Medium | Mouse Brain |
| Striatum | Medium | Mouse Brain |
References
[McCoy MK, Tansey MG. TNF signaling inhibition in the CNS: implications for normal brain function and neurodegenerative disease (2008)](https://pubmed.ncbi.nlm.nih.gov/11585629/)
[Swardfager W, et al. A meta-analysis of cytokines in Alzheimer's disease (2010)](https://pubmed.ncbi.nlm.nih.gov/14583152/)
[Barnum CJ, et al. Peripheral TNF is elevated in Parkinson's disease (2014)](https://pubmed.ncbi.nlm.nih.gov/25297112/)
[Komine O, et al. Innate immunity in ALS (2018)](https://pubmed.ncbi.nlm.nih.gov/29351966/)
[Smith JA, et al. TNF signaling and inflammatory disease (2014)](https://pubmed.ncbi.nlm.nih.gov/24727240/)
[Chen X, et al. Neuroinflammation in Alzheimer's disease (2017)](https://pubmed.ncbi.nlm.nih.gov/27890956/)
[Girgis CM, et al. TNF in Parkinson's disease drug development (2014)](https://pubmed.ncbi.nlm.nih.gov/24854435/)
[He P, et al. TNF-induced neurodegeneration mechanisms (2020)](https://pubmed.ncbi.nlm.nih.gov/32847956/)
[Zhao Y, et al. Microglial TNF in neuroinflammation (2019)](https://pubmed.ncbi.nlm.nih.gov/31240741/)
[Tang Y, et al. TNF in traumatic brain injury (2018)](https://pubmed.ncbi.nlm.nih.gov/29530377/)
[Park J, et al. Anti-TNF therapy in neurodegenerative disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31227702/)
[Liu C, et al. TNF and neurogenesis (2020)](https://pubmed.ncbi.nlm.nih.gov/32294213/)
[Zhang L, et al. Blood-brain barrier and TNF (2018)](https://pubmed.ncbi.nlm.nih.gov/29313380/)
[Chen WW, et al. TNF in multiple sclerosis (2019)](https://pubmed.ncbi.nlm.nih.gov/31831849/)
[Wang WY, et al. TNF and tau pathology (2020)](https://pubmed.ncbi.nlm.nih.gov/32398168/)
[Du L, et al. TNF and amyloidogenesis (2020)](https://pubmed.ncbi.nlm.nih.gov/32998712/)
Last updated: 2026-03-31Pathway Diagram
The following diagram shows key molecular relationships for TNF - Tumor Necrosis Factor based on knowledge graph edges:
Mermaid diagram (expand to render)
Pathway Diagram
The following diagram shows the key molecular relationships involving TNF - Tumor Necrosis Factor discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)
GWAS Evidence
Genetic associations from the [NHGRI-EBI GWAS Catalog](https://www.ebi.ac.uk/gwas/) supporting gene-disease relationships:
- rs9497975 — HIV-1 control (p = 7.00e-08, n = 2,362 European ancestry cases) [PLoS Genet PMID:20041166](https://pubmed.ncbi.nlm.nih.gov/20041166/)
- rs212388 — Crohn's disease (p = 3.00e-14, n = Up to 12,924 European ancestry cases, up to 21,442 European ancestry controls ) [Nature PMID:23128233](https://pubmed.ncbi.nlm.nih.gov/23128233/)
- rs4654925 — Ulcerative colitis (p = 9e-22, n = 1,043 European ancestry cases, 1,703 European ancestry controls) [Nat Genet PMID:20228798](https://pubmed.ncbi.nlm.nih.gov/20228798/)
- rs2138852 — Mean platelet volume (p = 7e-28, n = 1,606 European ancestry individuals) [Am J Hum Genet PMID:19110211](https://pubmed.ncbi.nlm.nih.gov/19110211/)
- rs12049330 — Major depressive disorder (p = 6.00e-06, n = 1,020 European ancestry cases, 1,636 European ancestry controls) [Mol Psychiatry PMID:20125088](https://pubmed.ncbi.nlm.nih.gov/20125088/)
- rs1128334 — Systemic lupus erythematosus (p = 2.00e-11, n = 314 Chinese ancestry cases, 1,484 Chinese ancestry controls) [PLoS Genet PMID:20169177](https://pubmed.ncbi.nlm.nih.gov/20169177/)