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.
| Attribute | Value | [@swardfager]
|-----------|-------| [1]
| Gene Symbol | TNF | [2]
| Full Name | Tumor Necrosis Factor |
| Chromosomal Location | 6p21.33 |
| NCBI Gene ID | 7124 |
| Ensembl ID | ENSG00000232890 |
| UniProt ID | P01375 |
| OMIM | 191160 |
| Gene Family | TNF superfamily |
| Protein Class | Cytokine |
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, and has profound effects on neuronal survival and function in the central nervous system.
TNF signals through two receptors:
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 |
| 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 |
The TNF signaling network includes:
| Activity | Mechanism |
|---|---|
| Inflammation | Leukocyte recruitment |
| Cytotoxicity | Apoptosis induction |
| Fever | Hypothalamic effect |
| Cachexia | Metabolic effects |
| Drug | Type | Indication |
|---|---|---|
| Etanercept | TNF receptor-Fc fusion | RA, psoriasis |
| Infliximab | Anti-TNF antibody | IBD, RA |
| Adalimumab | Anti-TNF antibody | Autoimmune |
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.
TNF exerts its effects through two distinct receptors:
TNF plays a central role in neuroinflammatory processes:
| 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 |
Transgenic and knockout mouse models have been instrumental:
TNF and its receptors serve as biomarkers:
TNF (Tumor Necrosis Factor) expression patterns:
TNF is expressed in:
| 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 |
Barnum CJ, et al. Peripheral TNF is elevated in Parkinson's disease. 2014. ↩︎
Komine O, et al. Innate immunity in ALS. 2018. ↩︎