TRAIL (TNF-Related Apoptosis-Inducing Ligand) Protein

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<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">TRAIL (TNF-Related Apoptosis-Inducing Ligand) Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>TNFSF10</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>3q26</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P50591</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>32.5 kDa (monomer), ~97.5 kDa (homotrimer)</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>281 amino acids</td>
</tr>
<tr>
<td class="label">Structure</td>
<td>Type II transmembrane protein with extracellular TNF homology domain</td>
</tr>
<tr>
<td class="label">Cellular Location</td>
<td>Cell surface (membrane-bound) and soluble (cleaved form)</td>
</tr>
<tr>
<td class="label">Receptor</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">DR4 (TRAIL-R1)</td>
<td>TNFRSF10A</td>
</tr>
<tr>
<td class="label">DR5 (TRAIL-R2)</td>
<td>TNFRSF10B</td>
</tr>
<tr>
<td class="label">Receptor</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">DcR1 (TRAIL-R3)</td>
<td>TNFRSF10C</td>
</tr>
<tr>
<td class="label">DcR2 (TRAIL-R4)</td>
<td>TNFRSF10D</td>
</tr>
<tr>
<td class="label">Osteoprotegerin (OPG)</td>
<td>TNFRSF11B</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">TRAIL-neutralizing antibodies</td>
<td>Block TRAIL interaction with death receptors</td>
</tr>
<tr>
<td class="label">DR5-Fc decoy receptors</td>
<td>Soluble receptor fusion protein scavenges TRAIL</td>
</tr>
<tr>
<td class="label">siRNA against TRAIL</td>
<td>Reduce TRAIL expression</td>
</tr>
<tr>
<td class="label">FADD dominant-negative</td>
<td>Block DISC formation</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">DR4 (TNFRSF10A)</td>
<td>Receptor binding</td>
</tr>
<tr>
<td class="label">DR5 (TNFRSF10B)</td>
<td>Receptor binding</td>
</tr>
<tr>
<td class="label">FADD</td>
<td>Adaptor protein</td>
</tr>
<tr>
<td class="label">Caspase-8</td>
<td>Proteolysis</td>
</tr>
<tr>
<td class="label">Bid</td>
<td>Proteolysis</td>
</tr>
<tr>
<td class="label">DcR1 (TNFRSF10C)</td>
<td>Decoy binding</td>
</tr>
<tr>
<td class="label">DcR2 (TNFRSF10D)</td>
<td>Decoy binding</td>
</tr>
<tr>
<td class="label">Aβ oligomers</td>
<td>Synergistic toxicity</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/lymphoma" style="color:#ef9a9a">Lymphoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">64 edges</a></td>
</tr>
</table>

TRAIL (TNF-related apoptosis-inducing ligand, encoded by the [TNFSF10](/genes/tnfsf10) gene) is a type II transmembrane protein belonging to the TNF superfamily. It functions as a homotrimeric cytokine capable of inducing apoptosis through engagement of death receptors DR4 (TRAIL-R1) and DR5 (TRAIL-R2). TRAIL plays a dual role in the nervous system: it contributes to immune surveillance and tumor cell killing, but can also mediate pathological neuronal death in [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), and other neurodegenerative conditions. [@burgaletto2020]

Gene and Protein Structure

Mermaid diagram (expand to render)

bfe67bb53c3c532ef4237fa3323691ae27404769

Receptors and Signaling

TRAIL signals through a complex system of receptors:

Death Receptors (Signaling)

Decoy Receptors (Non-signaling)

Apoptosis Signaling Pathway

When TRAIL binds DR4 or DR5:

DISC formation: Death receptors trimerize and recruit the adaptor protein FADD (Fas-associated death domain) and procaspase-8 (or procaspase-10)

Caspase-8 activation: Formation of the death-inducing signaling complex (DISC) leads to autocatalytic cleavage and activation of caspase-8

Execution pathway: Activated caspase-8 directly cleaves and activates effector caspases (caspase-3, caspase-7) and can also cleave Bid to generate tBid, linking to the mitochondrial (intrinsic) apoptosis pathway

Cellular dismantling: Active effector caspases cleave structural proteins and DNases, resulting in apoptotic cell death

Normal Function in the Nervous System

In the healthy CNS, TRAIL has several important physiological roles:

Immune Surveillance

TRAIL expressed on natural killer (NK) cells and some T cell subsets contributes to immune surveillance against brain tumors
Microglial cells can express TRAIL and may use it to eliminate transformed or infected cells

Developmental Apoptosis

TRAIL-mediated apoptosis contributes to developmental pruning of neurons
Regulation of neural progenitor cell populations during brain development

Regulation of Neurogenesis

TRAIL signaling can modulate adult neurogenesis in the hippocampus
Cross-talk with other TNF family cytokines in the neurogenic niche

Role in Alzheimer's Disease

TRAIL is strongly implicated in [Alzheimer's disease](/diseases/alzheimers-disease) pathogenesis through multiple mechanisms. [@burgaletto2020]

Expression in AD Brain

TRAIL is expressed in brain cells of [Alzheimer's disease](/diseases/alzheimers-disease) patients at significantly elevated levels compared to age-matched controls. Both neurons and glial cells can express TRAIL, and its expression colocalizes with amyloid plaques and in vulnerable brain regions including the hippocampus and entorhinal cortex. [@uberto2004]

Aβ-Induced TRAIL Expression

[Aβ](/proteins/amyloid-beta) oligomers induce TRAIL expression in neurons, astrocytes, and microglia through:

NF-κB-dependent transcriptional upregulation
JNK and p38 MAPK pathway activation
Receptor-mediated Aβ signaling through RAGE

Once induced, TRAIL acts in an autocrine and paracrine manner to promote neuronal apoptosis. Aβ-induced neuronal death can be significantly attenuated by neutralizing TRAIL with soluble decoy receptors or blocking antibodies. [@cantarella2003]

Apoptotic Pathways in AD

TRAIL contributes to neuronal death through:

Direct activation of caspase-8: Leading to rapid caspase-3 activation
Cross-talk with mitochondrial pathway: Through Bid cleavage and cytochrome c release
Synergistic toxicity with Aβ: TRAIL and Aβ act together to amplify apoptotic signaling
Microglial-mediated neurotoxicity: Microglial TRAIL can kill nearby neurons

Therapeutic Implications

TRAIL-neutralizing antibodies: Protect neurons from Aβ/TRAIL-mediated toxicity in preclinical models
DR5-Fc decoy receptors: Soluble receptor fusion protein scavenges TRAIL
Decoy receptor overexpression: Viral vector-mediated expression of DcR2 to block TRAIL signaling

Role in Parkinson's Disease

In [Parkinson's disease](/diseases/parkinsons-disease), TRAIL contributes to dopaminergic neuron death:

MPTP and 6-OHDA models show increased TRAIL expression in the substantia nigra
TNF-α and other inflammatory cytokines upregulate TRAIL in dopaminergic neurons
Blocking TRAIL reduces dopaminergic neuron loss in animal models
Cross-talk between α-synuclein aggregation and TRAIL-mediated apoptosis

Role in Other Neurodegenerative Disorders

Amyotrophic Lateral Sclerosis (ALS)

Motor neurons from ALS patients show increased sensitivity to TRAIL
Mutant SOD1 protein promotes TRAIL-mediated motor neuron death
Astrocytes from ALS patients express elevated TRAIL and can kill motor neurons in co-culture
TRAIL-neutralizing strategies are protective in SOD1 mouse models

Multiple Sclerosis (MS) and Demyelination

TRAIL contributes to oligodendrocyte apoptosis in demyelinating diseases
While TRAIL can help eliminate autoreactive immune cells, it also damages oligodendrocytes and neurons
Modulation of TRAIL signaling is being explored as a therapeutic strategy

TRAIL mediates neuronal death in alcohol use disorder through neuroinflammation. [@qin2021]

Therapeutic Targeting

Preclinical Strategies

Clinical Status

No TRAIL-targeted therapies have reached clinical trials for neurodegenerative disease. TRAIL-based anticancer therapies (recombinant TRAIL, agonistic antibodies) have been tested in oncology but faced limitations due to liver toxicity and insufficient efficacy as monotherapy.

Challenges

Systemic vs. CNS targeting: TRAIL-blocking agents may need to cross the blood-brain barrier
Dual roles: TRAIL has beneficial immune surveillance functions; global inhibition may have adverse effects
Delivery: Ensuring adequate CNS concentrations of therapeutic agents
Patient selection: Identifying patients with elevated TRAIL activity who would benefit most

Protein Interactions

References

[Burgaletto C, et al., The immune system on the TRAIL of Alzheimer's disease. Advances in Experimental Medicine and Biology (2020)](https://pubmed.ncbi.nlm.nih.gov/33050925/)

[Huang Y, et al., The role of TNF related apoptosis-inducing ligand in neurodegenerative diseases. Neurochemical Research (2005)](https://pubmed.ncbi.nlm.nih.gov/16191417/)

[Uberti D, et al., TRAIL is expressed in the brain cells of Alzheimer's disease patients. Brain Research (2004)](https://pubmed.ncbi.nlm.nih.gov/15094456/)

[Qin L, et al., TRAIL Mediates Neuronal Death in AUD: A Link between Neuroinflammation and Neurodegeneration. Biomolecules (2021)](https://pubmed.ncbi.nlm.nih.gov/33806288/)

[Di Benedetto G, et al., The Proinflammatory Cytokine GITRL Contributes to TRAIL-mediated Neurotoxicity in the HCN-2 Human Neuronal Cell Line. Journal of Neuroimmune Pharmacology (2017)](https://pubmed.ncbi.nlm.nih.gov/28524007/)

[Cantarella G, et al., Neutralization of TRAIL death pathway protects human neuronal cell line from beta-amyloid toxicity. Molecular Biology of the Cell (2003)](https://pubmed.ncbi.nlm.nih.gov/12655302/)

Pathway Diagram

The following diagram shows the key molecular relationships involving TRAIL (TNF-Related Apoptosis-Inducing Ligand) Protein discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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TRAIL (TNF-Related Apoptosis-Inducing Ligand) Protein