GO:1902042 negative regulation of extrinsic apoptotic signaling pathway via death domain receptors: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902042 describes any process that stops, prevents or reduces the frequency, rate or extent of extrinsic apoptotic signaling pathway via death domain receptors.
• Death domain receptors such as TNFR1, FAS, TRAIL-R1/R2, and DR3 transmit extracellular death signals; their negative regulation is critical for preventing inappropriate apoptosis.
• Cordyceps militaris induces apoptosis in ovarian cancer cells through TNF-alpha/TNFR1-mediated inhibition of NF-kappaB phosphorylation, illustrating how death receptor signaling can be modulated.
• TLR3 induces apoptosis via death receptors and mitochondria by up-regulating TAP63alpha, showing crosstalk between innate immune sensing and death receptor pathways.
• Dysregulation of this process contributes to cancer, autoimmune diseases, and neurodegeneration, making it a therapeutic target.
• CRISPR knockout, point mutation, knock-in, and overexpression models enable precise dissection of negative regulators of death receptor-mediated apoptosis.
Description
The extrinsic apoptotic signaling pathway via death domain receptors is a fundamental mechanism by which cells respond to extracellular death ligands, including TNF-alpha, FasL, and TRAIL. This pathway is initiated when ligands bind to death receptors such as TNFR1, FAS, DR4, and DR5, leading to receptor trimerization and recruitment of adaptor proteins like FADD and TRADD. While activation of this pathway is essential for immune surveillance and tissue homeostasis, its excessive or inappropriate activation can cause tissue damage and autoimmune pathology. Consequently, cells have evolved multiple layers of negative regulation to keep death receptor signaling in check. GO:1902042, negative regulation of extrinsic apoptotic signaling pathway via death domain receptors, captures these protective mechanisms. Understanding this GO term is crucial for researchers studying cancer resistance to apoptosis, inflammatory diseases, and neurodegenerative disorders. Recent studies have shown that natural compounds like Cordyceps militaris can modulate TNF-alpha/TNFR1 signaling to induce apoptosis in ovarian cancer cells, highlighting the therapeutic potential of targeting this pathway. Additionally, TLR3 activation can up-regulate TAP63alpha, which in turn promotes apoptosis via death receptors, demonstrating the complex interplay between innate immunity and cell death machinery. This article provides a comprehensive overview of GO:1902042, covering its definition, biological significance, key genes, regulatory mechanisms, disease associations, and state-of-the-art research methods including CRISPR-based models.
negative regulation of extrinsic apoptotic signaling pathway via death domain receptors At A Glance
| GO ID | GO:1902042 |
|---|---|
| GO term | negative regulation of extrinsic apoptotic signaling pathway via death domain receptors |
| Ontology | biological_process |
| Synonym | down regulation of death receptor-mediated apoptosis; inhibition of extrinsic apoptotic signaling pathway via death domain receptors; negative regulation of death receptor-mediated apoptosis |
| Major function | Suppression of death receptor-induced apoptosis to maintain cellular homeostasis and prevent inappropriate cell death |
| Related pathways | TNF-alpha/TNFR1 signaling, Fas/FasL pathway, TRAIL/TRAIL-R pathway, TLR3-mediated apoptosis |
| Key regulators | NF-kappaB, c-FLIP, Bcl-2 family proteins, IAPs, decoy receptors |
| Disease relevance | Cancer, autoimmune diseases, neurodegeneration, inflammatory disorders |
What Is GO:1902042?
GO:1902042 is defined as any process that stops, prevents or reduces the frequency, rate or extent of extrinsic apoptotic signaling pathway via death domain receptors. In other words, it encompasses all molecular events that dampen or block the cascade of reactions triggered when death ligands bind to death domain receptors such as TNFR1, FAS, or TRAIL receptors. This negative regulation can occur at multiple levels, including ligand sequestration, receptor internalization, decoy receptor competition, inhibition of adaptor protein recruitment, and blockade of downstream caspase activation. The term is a biological process and is distinct from positive regulation of the same pathway.
Why Is negative regulation of extrinsic apoptotic signaling pathway via death domain receptors Important in Cell Biology?
GO:1902042 is critically important because the balance between pro-apoptotic and anti-apoptotic signals determines cell fate in numerous physiological and pathological contexts. Negative regulation of death receptor signaling prevents accidental apoptosis in healthy tissues, but its dysregulation can lead to cancer cell survival, autoimmune reactions, or neurodegeneration. For example, many tumors overexpress anti-apoptotic proteins or decoy receptors to evade death receptor-induced apoptosis, contributing to chemoresistance. Conversely, excessive negative regulation may promote autoimmunity by allowing autoreactive lymphocytes to survive. Understanding the molecular players and mechanisms of GO:1902042 is therefore essential for developing targeted therapies that can either sensitize cancer cells to apoptosis or protect vulnerable neurons from death.
• Maintains tissue homeostasis by preventing unwanted apoptosis in healthy cells.
• Contributes to immune evasion in cancer by blocking death receptor-mediated apoptosis.
• Dysregulation is linked to autoimmune diseases due to survival of autoreactive immune cells.
• Plays a role in neurodegeneration where inappropriate apoptosis contributes to neuronal loss.
• Modulates response to chemotherapy and targeted therapies in oncology.
• Crosstalks with innate immune signaling pathways such as TLR3.
• Provides targets for therapeutic intervention in inflammatory diseases.
• Essential for understanding resistance mechanisms to apoptosis-inducing agents.
• Involved in development and tissue remodeling.
• Key area for CRISPR-based functional genomics and drug discovery.
What Happens During negative regulation of extrinsic apoptotic signaling pathway via death domain receptors?
Ligand sequestration and decoy receptors
In simple terms: Cells can block death signals by trapping the death ligands or using decoy receptors that bind ligands but do not trigger apoptosis.
Negative regulation of extrinsic apoptosis can occur at the ligand level. Soluble decoy receptors such as DcR1, DcR2, and osteoprotegerin compete with death receptors for ligand binding, thereby preventing receptor activation. Additionally, soluble forms of death receptors can sequester ligands, reducing their availability to membrane-bound functional receptors. This mechanism is particularly relevant in cancer, where overexpression of decoy receptors contributes to resistance to TRAIL-induced apoptosis.
Receptor internalization and degradation
In simple terms: After activation, death receptors can be pulled inside the cell and destroyed, stopping the death signal.
Upon ligand binding, death receptors can undergo endocytosis and subsequent degradation in lysosomes, which attenuates the apoptotic signal. This process is regulated by ubiquitination and interactions with adaptor proteins such as c-Cbl. Negative regulation via receptor internalization serves as a rapid desensitization mechanism to prevent excessive apoptosis.
Inhibition of adaptor protein recruitment
In simple terms: Cells can prevent the assembly of the death-inducing signaling complex (DISC) by blocking the recruitment of adaptor proteins like FADD and TRADD.
The formation of the DISC is a critical step in extrinsic apoptosis. Negative regulators such as c-FLIP can bind to FADD and caspase-8, preventing caspase-8 activation. Similarly, proteins like FLIP and PED/PEA-15 inhibit DISC assembly. This level of regulation is crucial for controlling the threshold of apoptosis induction.
Blockade of caspase activation
In simple terms: Even if the death signal starts, cells can stop it by inhibiting the caspases that carry out apoptosis.
Inhibitor of apoptosis proteins (IAPs) such as XIAP, cIAP1, and cIAP2 directly bind and inhibit caspases-3, -7, and -9, thereby blocking apoptosis downstream of death receptor activation. Additionally, the NF-kappaB pathway induced by TNFR1 can up-regulate anti-apoptotic proteins like c-FLIP, Bcl-xL, and A20, further dampening the apoptotic cascade. Cordyceps militaris has been shown to induce apoptosis in ovarian cancer cells through TNF-alpha/TNFR1-mediated inhibition of NF-kappaB phosphorylation, suggesting that NF-kappaB activation is a key negative regulator.
Modulation by TAP63alpha and TLR3 signaling
In simple terms: Immune sensors like TLR3 can influence death receptor pathways by changing the expression of pro- or anti-apoptotic proteins.
TLR3 activation induces apoptosis via death receptors and mitochondria by up-regulating the transactivating p63 isoform alpha (TAP63alpha). TAP63alpha can transcriptionally activate pro-apoptotic genes such as FAS and PUMA, thereby promoting apoptosis. However, negative regulation of this pathway may involve factors that suppress TAP63alpha expression or activity, though the exact mechanisms remain to be fully elucidated.
Key Genes Involved in GO:1902042 negative regulation of extrinsic apoptotic signaling pathway via death domain receptors
The following genes and proteins are key players in the negative regulation of extrinsic apoptotic signaling via death domain receptors, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NFKB1 | Transcription factor that up-regulates anti-apoptotic genes | Central negative regulator of TNF-alpha-induced apoptosis |
| c-FLIP (CFLAR) | Inhibits caspase-8 activation at the DISC | Key anti-apoptotic protein in cancer |
| XIAP | Inhibits caspases-3, -7, and -9 | Therapeutic target in chemoresistance |
| Bcl-xL (BCL2L1) | Anti-apoptotic mitochondrial protein | Modulates intrinsic pathway crosstalk |
| A20 (TNFAIP3) | Ubiquitin-editing enzyme that inhibits NF-kappaB and apoptosis | Negative regulator of TNFR1 signaling |
| DcR1 (TNFRSF10C) | Decoy receptor for TRAIL | Prevents TRAIL-induced apoptosis in cancer |
| DcR2 (TNFRSF10D) | Decoy receptor for TRAIL | Competes with DR5 for ligand binding |
| OPG (TNFRSF11B) | Soluble decoy receptor for TRAIL | Inhibits TRAIL-mediated apoptosis |
| FADD | Adaptor protein that recruits caspase-8 | Its inhibition blocks DISC formation |
| TRADD | Adaptor protein for TNFR1 | Scaffold for NF-kappaB activation and apoptosis |
| TAP63alpha (TP63) | Transcription factor that up-regulates death receptors | Induced by TLR3 to promote apoptosis |
| CASP8 | Initiator caspase in extrinsic apoptosis | Its activation is blocked by c-FLIP |
| CASP3 | Executioner caspase | Inhibited by XIAP |
| TNFRSF1A | Death receptor for TNF-alpha | Central to TNF-induced apoptosis and NF-kappaB activation |
| FAS | Death receptor for FasL | Regulates lymphocyte apoptosis |
| TNFRSF10A/B | TRAIL receptors DR4/DR5 | Mediate TRAIL-induced apoptosis |
| BIRC2/BIRC3 | cIAP1/cIAP2 E3 ubiquitin ligases | Regulate NF-kappaB and apoptosis |
How Is negative regulation of extrinsic apoptotic signaling pathway via death domain receptors Regulated?
The negative regulation of extrinsic apoptotic signaling via death domain receptors is itself tightly regulated at multiple levels. The NF-kappaB pathway is a major transcriptional regulator that induces anti-apoptotic proteins such as c-FLIP, Bcl-xL, and A20 in response to TNFR1 activation. Phosphorylation of NF-kappaB is a key event; inhibition of NF-kappaB phosphorylation by Cordyceps militaris has been shown to sensitize ovarian cancer cells to TNF-alpha/TNFR1-mediated apoptosis. Additionally, ubiquitination and deubiquitination of signaling components by enzymes like A20 and cIAPs modulate the strength and duration of death receptor signals. TLR3 signaling can up-regulate TAP63alpha, which in turn promotes apoptosis, indicating that negative regulation may also involve suppression of TAP63alpha activity. The interplay between these regulatory layers determines cell fate.
negative regulation of extrinsic apoptotic signaling pathway via death domain receptors and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CFLAR (c-FLIP) | Cancer chemoresistance | Knockout in cancer cell lines to sensitize to TRAIL |
| XIAP | Cancer, chemoresistance | Point mutation to disrupt caspase binding |
| TNFRSF10C (DcR1) | Cancer resistance to TRAIL | Overexpression in TRAIL-sensitive cells |
| TP63 (TAP63alpha) | TLR3-mediated apoptosis, cancer | Knock-in of TAP63alpha to study death receptor up-regulation |
| TNFAIP3 (A20) | Autoimmunity, lymphoma | Knockout to study NF-kappaB hyperactivation |
Cancer
Many cancers evade apoptosis by up-regulating negative regulators of death receptor signaling. Overexpression of c-FLIP, XIAP, Bcl-xL, and decoy receptors is frequently observed in tumors and correlates with resistance to chemotherapy and TRAIL-based therapies. For instance, Cordyceps militaris induces apoptosis in ovarian cancer cells through TNF-alpha/TNFR1-mediated inhibition of NF-kappaB phosphorylation, suggesting that targeting negative regulators can restore apoptosis. Therefore, inhibitors of anti-apoptotic proteins are being explored as anticancer agents.
Autoimmune diseases
Defective negative regulation of death receptor apoptosis can lead to the survival of autoreactive lymphocytes, contributing to autoimmune diseases such as systemic lupus erythematosus and rheumatoid arthritis. Mutations in FAS or FASLG cause autoimmune lymphoproliferative syndrome (ALPS), highlighting the importance of proper death receptor regulation.
Neurodegeneration
In neurodegenerative disorders like Alzheimer's and Parkinson's diseases, excessive apoptosis via death receptors contributes to neuronal loss. Enhancing negative regulation or blocking death receptor signaling may be neuroprotective, although the balance must be carefully maintained.
Infectious and inflammatory diseases
TLR3 activation by viral double-stranded RNA up-regulates TAP63alpha, which promotes apoptosis via death receptors, serving as an antiviral defense mechanism. However, dysregulated negative regulation may lead to excessive inflammation or tissue damage.
From negative regulation of extrinsic apoptotic signaling pathway via death domain receptors-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does knockout of c-FLIP sensitize cancer cells to TNF-alpha-induced apoptosis? | CRISPR knockout of CFLAR in HeLa or MCF-7 cells |
| Can a point mutation in XIAP abolish its caspase inhibitory function? | CRISPR point mutation in XIAP BIR domain |
| Does overexpression of DcR1 protect cells from TRAIL-induced apoptosis? | Knock-in of TNFRSF10C under a strong promoter |
| What is the role of TAP63alpha in TLR3-mediated apoptosis? | Knockout of TP63 in TLR3-expressing cells |
| How does A20 regulate TNFR1 signaling? | Tagged knock-in of TNFAIP3 with GFP for live imaging |
| Can CRISPR library screening identify novel negative regulators of death receptor apoptosis? | Genome-wide CRISPR knockout library in TRAIL-treated cells |
How to Study the negative regulation of extrinsic apoptotic signaling pathway via death domain receptors Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss of gene function | Identify negative regulators of death receptor apoptosis |
| CRISPR point mutation | Specific amino acid changes | Dissect domain functions in XIAP or c-FLIP |
| Knock-in with tag | Protein localization and interactions | Live imaging of A20 dynamics |
| Overexpression | Gain of function | Test decoy receptor protection against TRAIL |
| CRISPR library screening | Genome-wide fitness | Discover novel regulators of apoptosis |
| RNA-seq | Transcriptional changes | Measure NF-kappaB target genes upon TNF-alpha treatment |
| Proteomics | Protein abundance and modifications | Analyze DISC composition |
| Flow cytometry | Apoptosis quantification | Measure caspase-3/7 activity or Annexin V staining |
CRISPR knockout and point mutation
CRISPR-Cas9 knockout is widely used to ablate candidate negative regulators such as CFLAR, XIAP, and TNFAIP3 to assess their role in death receptor apoptosis. Point mutations can be introduced to dissect specific domains, e.g., caspase-binding sites in XIAP. These approaches enable causal inference in cancer cell lines and primary cells.
Knock-in and overexpression
Knock-in of tagged versions of genes like TNFAIP3 (A20) allows live-cell imaging and proteomic analysis. Overexpression of decoy receptors such as DcR1 can be achieved via lentiviral transduction to study their protective effects against TRAIL. These models are essential for understanding gain-of-function mechanisms.
CRISPR library screening
Genome-wide CRISPR knockout or activation libraries can be used to identify novel negative regulators of extrinsic apoptosis. Cells are treated with death ligands (e.g., TRAIL, TNF-alpha) and surviving cells are sequenced to find enriched sgRNAs targeting candidate genes. This unbiased approach has revealed numerous regulators and is a powerful tool for drug target discovery.
Bioinformatics and pathway analysis
RNA-seq and proteomics data from CRISPR models can be integrated with pathway databases to map the regulatory network of GO:1902042. Computational tools such as GSEA and STRING help identify enriched processes and interactions. These analyses guide hypothesis generation and validation.
How CRISPR Can Be Used to Study GO:1902042 negative regulation of extrinsic apoptotic signaling pathway via death domain receptors
Knockout
CRISPR knockout of negative regulators such as CFLAR, XIAP, or TNFAIP3 can sensitize cells to death receptor-induced apoptosis. For example, knocking out CFLAR in cancer cells enhances TRAIL-induced caspase-8 activation and cell death. These models are invaluable for validating targets identified in screens.
Point Mutation
Point mutations can be introduced to disrupt specific functional domains, such as the caspase-binding site of XIAP or the death effector domain of c-FLIP. This allows precise mapping of residues critical for negative regulation. Such models help distinguish between scaffolding and catalytic functions.
Knock-in
Knock-in of tagged or reporter genes (e.g., GFP-A20) enables real-time monitoring of protein dynamics and interactions during death receptor signaling. Knock-in of disease-associated mutations can also model human pathologies.
Overexpression
Overexpression of anti-apoptotic genes like BCL2L1 or decoy receptors such as TNFRSF10C can protect cells from apoptosis, mimicking cancer resistance mechanisms. These models are useful for testing drugs that overcome resistance.
How EDITGENE Supports negative regulation of extrinsic apoptotic signaling pathway via death domain receptors Research
Researchers studying negative regulation of extrinsic apoptotic signaling pathway via death domain receptors-related genes often need to determine whether a candidate gene is causally involved in modulating cell death. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation and drug discovery.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of extrinsic apoptotic signaling pathway via death domain receptors research.
Frequently Asked Questions About negative regulation of extrinsic apoptotic signaling pathway via death domain receptors
What is GO:1902042?
GO:1902042 is a Gene Ontology biological process term defined as any process that stops, prevents or reduces the frequency, rate or extent of extrinsic apoptotic signaling pathway via death domain receptors.
What genes are involved in negative regulation of extrinsic apoptotic signaling pathway via death domain receptors?
Key genes include CFLAR (c-FLIP), XIAP, BCL2L1, TNFAIP3 (A20), TNFRSF10C (DcR1), and TP63 (TAP63alpha).
How does negative regulation of death receptor apoptosis work?
It works through multiple mechanisms including ligand sequestration by decoy receptors, receptor internalization, inhibition of DISC formation by c-FLIP, and blockade of caspase activation by IAPs.
What diseases are associated with dysregulation of this pathway?
Cancer, autoimmune diseases, neurodegeneration, and inflammatory disorders are associated with dysregulated negative regulation of death receptor apoptosis.
What is the role of NF-kappaB in this process?
NF-kappaB up-regulates anti-apoptotic proteins such as c-FLIP, Bcl-xL, and A20, thereby negatively regulating death receptor-induced apoptosis.
How can CRISPR be used to study GO:1902042?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional dissection of genes involved in this pathway.
What is TAP63alpha and how does it relate to death receptor apoptosis?
TAP63alpha is a p63 isoform up-regulated by TLR3 that promotes apoptosis via death receptors and mitochondria.
What are decoy receptors in death receptor signaling?
Decoy receptors such as DcR1, DcR2, and OPG bind death ligands but do not transmit apoptotic signals, thus negatively regulating the pathway.
Can natural compounds modulate negative regulation of death receptor apoptosis?
Yes, Cordyceps militaris has been shown to induce apoptosis in ovarian cancer cells through TNF-alpha/TNFR1-mediated inhibition of NF-kappaB phosphorylation.
What research methods are used to study this GO term?
Common methods include CRISPR screens, RNA-seq, proteomics, flow cytometry, and bioinformatics pathway analysis.
Conclusion
GO:1902042, negative regulation of extrinsic apoptotic signaling pathway via death domain receptors, is a critical biological process that controls cell fate decisions in health and disease. Its dysregulation contributes to cancer, autoimmunity, and neurodegeneration, making it a prime target for therapeutic intervention. Advances in CRISPR-based models and high-throughput screening are accelerating the discovery of novel regulators and drugs targeting this pathway. EDITGENE's comprehensive services empower researchers to dissect these mechanisms with precision and speed.
References
- 1. Jo E et al.. 2020. Cordyceps militaris induces apoptosis in ovarian cancer cells through TNF-α/TNFR1-mediated inhibition of NF-κB phosphorylation.. BMC Complement Med Ther 20(1):1 PMID: 32020859
- 2. Sun R et al.. 2011. Toll-like receptor 3 (TLR3) induces apoptosis via death receptors and mitochondria by up-regulating the transactivating p63 isoform alpha (TAP63alpha).. J Biol Chem 286(18):15918-28 PMID: 21367858
