GO:1903265 positive regulation of tumor necrosis factor-mediated signaling pathway: Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1903265 describes any process that activates or increases the frequency, rate or extent of tumor necrosis factor (TNF)-mediated signaling.
• TNF-mediated signaling is a central inflammatory and apoptotic pathway; its positive regulation amplifies immune responses and can drive tissue damage.
• CD4, PDGF-BB, bFGF, and FAM83A are among the genes and factors experimentally linked to modulation of TNF-mediated signaling.
• Dysregulation of this process is implicated in steroid-induced necrosis of the femoral head, cancer progression, and radiation-induced intestinal injury.
• CRISPR knockout, point mutation, knock-in, and overexpression models enable causal dissection of positive regulators within this pathway.
• The term is a biological process node in the Gene Ontology, with synonyms including activation of TNF-alpha-mediated signaling pathway.
Description
GO:1903265, positive regulation of tumor necrosis factor-mediated signaling pathway, is a Gene Ontology biological process term defined as any process that activates or increases the frequency, rate or extent of tumor necrosis factor-mediated signaling pathway. Tumor necrosis factor (TNF) is a pleiotropic cytokine that triggers signaling cascades controlling inflammation, apoptosis, and cell survival. Positive regulation of this pathway therefore represents a critical control point in immune and tissue homeostasis. Understanding which genes and factors enhance TNF signaling is essential for researchers studying inflammatory diseases, cancer, and regenerative medicine. This article integrates the QuickGO definition with verified PubMed literature to provide a research-grade overview of the term, its mechanisms, key genes, disease relevance, and experimental methods.
positive regulation of tumor necrosis factor-mediated signaling pathway At A Glance
| GO ID | GO:1903265 |
|---|---|
| GO term | positive regulation of tumor necrosis factor-mediated signaling pathway |
| Ontology | biological_process |
| Synonym | activation of TNF-alpha-mediated signaling pathway; positive regulation of adipocytokine signaling pathway; upregulation of tumor necrosis factor-mediated signaling pathway |
| Major function | Enhances the frequency, rate, or extent of TNF-mediated signaling, amplifying inflammatory and apoptotic responses. |
| Related genes | CD4, PDGF-BB, bFGF, FAM83A, and other modulators of TNF signaling. |
| Disease relevance | Steroid-induced necrosis of the femoral head, cancer progression, radiation-induced intestinal injury. |
| Research methods | CRISPR KO/point mutation/knock-in/overexpression, RNA-seq, proteomics, apoptosis assays. |
What Is GO:1903265?
In our own words, GO:1903265 encompasses any molecular or cellular event that boosts the activity of the signaling cascade initiated by TNF binding to its receptor. This includes increased expression or activity of TNF itself, its receptors (TNFR1/TNFR2), or downstream adaptor proteins such as TRADD, TRAF2, and RIPK1, as well as suppression of negative regulators. The term is a child of positive regulation of signal transduction and is specific to the TNF-mediated branch.
Why Is positive regulation of tumor necrosis factor-mediated signaling pathway Important in Cell Biology?
Positive regulation of TNF-mediated signaling is a double-edged sword: it is required for effective host defense and tissue repair, but excessive activation contributes to chronic inflammation, autoimmune diseases, and cancer progression. Understanding the positive regulators of this pathway can reveal therapeutic targets for modulating inflammation and cell death in diverse pathologies.
• TNF signaling is a master regulator of inflammation and apoptosis; its positive regulation amplifies these responses.
• CD4 expression modulates susceptibility to TNF-mediated apoptosis, linking T-cell biology to this process.
• PDGF-BB and bFGF ameliorate radiation-induced intestinal apoptosis via Akt/p53 signaling, intersecting with TNF pathways.
• Human placenta hydrolysate promotes liver regeneration through cytokine/growth factor-mediated pathways, including TNF-related signaling.
• FAM83A promotes tumor cell proliferation and metastasis, potentially through TNF-mediated signaling in cervical cancer.
• Differential gene expression in steroid-induced necrosis of the femoral head implicates immune cell infiltration and TNF signaling.
• Targeting positive regulators of TNF signaling may treat inflammatory diseases and cancer.
• CRISPR screens can identify novel positive regulators of TNF-mediated signaling.
• The pathway is a key node in cytokine-cytokine receptor interaction networks.
• Understanding positive regulation helps design biologics and small molecules that fine-tune TNF activity.
What Happens During positive regulation of tumor necrosis factor-mediated signaling pathway?
TNF Ligand Binding and Receptor Activation
In simple terms: TNF binds to its receptor, turning on the signaling switch.
The pathway begins when TNF trimer binds to TNFR1 or TNFR2, inducing receptor trimerization and recruitment of adaptor proteins. Positive regulation can occur via increased TNF expression or enhanced receptor sensitivity.
Formation of the Signaling Complex
In simple terms: A protein complex assembles inside the cell to relay the signal.
Upon receptor activation, TRADD, TRAF2, RIPK1, and other proteins form a signaling complex that activates downstream kinases such as IKK and MAPKs. Positive regulators stabilize this complex or promote its assembly.
Activation of NF-kB and MAPK Cascades
In simple terms: The signal travels to the nucleus to turn on inflammatory genes.
The complex activates NF-kB and MAPK pathways, leading to transcription of pro-inflammatory cytokines and survival factors. Positive regulation enhances the magnitude or duration of these signals.
Apoptosis and Cell Death Modulation
In simple terms: The pathway can also tell the cell to die.
TNF signaling can switch to apoptosis via caspase-8 activation. Positive regulators may tip the balance toward cell death, as seen in CD4-mediated susceptibility to TNF-induced apoptosis.
Crosstalk with Growth Factor Signaling
In simple terms: Other growth signals can boost or dampen TNF signaling.
PDGF-BB and bFGF ameliorate radiation-induced apoptosis via Akt/p53, intersecting with TNF pathways. Human placenta hydrolysate activates cytokine/growth factor-mediated pathways, including TNF-related signaling, to promote liver regeneration.
Key Genes Involved in GO:1903265 positive regulation of tumor necrosis factor-mediated signaling pathway
The following genes and proteins have been experimentally linked to the positive regulation of TNF-mediated signaling or its downstream effects.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TNF | Ligand that initiates signaling | Central to pathway activation; target for anti-inflammatory drugs. |
| CD4 | Modulates susceptibility to TNF-mediated apoptosis | Links T-cell biology to TNF signaling. |
| PDGF-BB | Growth factor that ameliorates radiation-induced apoptosis | Crosstalk with Akt/p53 and TNF pathways. |
| bFGF | Growth factor with similar protective effects | Modulates apoptosis via Akt/p53. |
| FAM83A | Promotes tumor proliferation and metastasis | Potential oncogene linked to TNF signaling in cervical cancer. |
| TNFR1 | TNF receptor 1 | Mediates most TNF signaling; positive regulation target. |
| TNFR2 | TNF receptor 2 | Modulates immune cell survival and proliferation. |
| TRADD | Adaptor protein | Recruits TRAF2 and RIPK1 to TNFR1. |
| TRAF2 | E3 ubiquitin ligase | Activates NF-kB and MAPK. |
| RIPK1 | Serine/threonine kinase | Key regulator of NF-kB and cell death. |
| IKK | IkB kinase complex | Activates NF-kB. |
| NF-kB | Transcription factor | Drives pro-inflammatory gene expression. |
| Caspase-8 | Apoptotic initiator caspase | Mediates TNF-induced apoptosis. |
| Akt | Survival kinase | Crosstalk with TNF signaling. |
| p53 | Tumor suppressor | Modulates apoptosis in response to TNF. |
| FADD | Adaptor protein | Recruits caspase-8 to death receptor complex. |
How Is positive regulation of tumor necrosis factor-mediated signaling pathway Regulated?
Positive regulation of TNF-mediated signaling is itself tightly controlled by feedback loops. Negative regulators such as A20, CYLD, and SOCS proteins can dampen the pathway, while positive regulators include kinases like IKK and MAPKs. Growth factors such as PDGF-BB and bFGF can modulate the pathway via Akt/p53. Human placenta hydrolysate activates cytokine/growth factor-mediated pathways, suggesting nutritional or pharmacological modulation. In cancer, FAM83A may enhance TNF signaling to promote proliferation.
positive regulation of tumor necrosis factor-mediated signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FAM83A | Cervical cancer | KO and overexpression in HeLa or SiHa cells |
| CD4 | TNF-mediated apoptosis | CD4 knockout T cells |
| PDGF-BB | Radiation-induced intestinal injury | Mouse intestinal organoids |
| bFGF | Radiation-induced intestinal injury | Mouse models |
| TNF | Inflammatory diseases | TNF knockout mice |
Steroid-induced Necrosis of the Femoral Head
Differential gene expression and immune cell infiltration in patients with steroid-induced necrosis of the femoral head implicate TNF-mediated signaling and positive regulation in disease pathogenesis.
Cancer Progression
FAM83A promotes tumor cell proliferation and metastasis and predicts poor prognosis in cervical cancer, potentially through positive regulation of TNF-mediated signaling.
Radiation-induced Intestinal Injury
PDGF-BB and bFGF ameliorate radiation-induced intestinal progenitor/stem cell apoptosis via Akt/p53 signaling, which intersects with TNF-mediated pathways.
Liver Regeneration
Human placenta hydrolysate promotes liver regeneration via activation of cytokine/growth factor-mediated pathways, including TNF-related signaling.
From positive regulation of tumor necrosis factor-mediated signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate TNF signaling? | CRISPR knockout in HEK293 or HeLa cells |
| Does a point mutation in gene X alter TNF signaling? | CRISPR point mutation knock-in |
| Does overexpression of gene X enhance TNF signaling? | CRISPR overexpression (CRISPRa) or lentiviral overexpression |
| Does tagging gene X affect its function? | Tagged knock-in (e.g., GFP, FLAG) |
| Which genes are positive regulators in a genome-wide screen? | CRISPR library screening |
| What is the transcriptional response to TNF? | RNA-seq after TNF stimulation |
How to Study the positive regulation of tumor necrosis factor-mediated signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Gene essentiality for TNF signaling | Identify positive regulators |
| RNA-seq | Transcriptional changes | Measure TNF-induced gene expression |
| Proteomics | Protein abundance and modifications | Map signaling complexes |
| Phosphoproteomics | Kinase activity | Identify activated pathways |
| Flow cytometry | Apoptosis and cell survival | Quantify TNF-induced death |
| Luciferase reporter | NF-kB activity | Measure pathway activation |
| Co-immunoprecipitation | Protein-protein interactions | Study signaling complex assembly |
| CRISPR activation (CRISPRa) | Gene overexpression | Test positive regulators |
CRISPR Knockout Screening
Genome-wide CRISPR knockout screens can identify genes whose loss reduces TNF-mediated signaling, revealing positive regulators.
RNA-seq and Transcriptomics
RNA-seq after TNF stimulation measures changes in gene expression and can identify pathways co-regulated with TNF signaling.
Proteomics and Phosphoproteomics
Mass spectrometry can quantify phosphorylation events in TNF signaling cascades, identifying activated kinases and substrates.
Apoptosis Assays
Flow cytometry and caspase activity assays measure TNF-induced apoptosis, a key output of positive regulation.
How CRISPR Can Be Used to Study GO:1903265 positive regulation of tumor necrosis factor-mediated signaling pathway
Knockout
CRISPR knockout of candidate positive regulators (e.g., FAM83A) can reduce TNF-mediated signaling and its downstream effects, validating their role.
Point Mutation
Introducing point mutations in genes such as CD4 or TNF receptors can dissect specific residues required for positive regulation of TNF signaling.
Knock-in
Knock-in of tagged versions of signaling components (e.g., GFP-TRAF2) allows live-cell imaging and biochemical isolation of complexes.
Overexpression
CRISPR activation or lentiviral overexpression of genes like PDGF-BB or bFGF can test whether they enhance TNF signaling and protect against apoptosis.
How EDITGENE Supports positive regulation of tumor necrosis factor-mediated signaling pathway Research
Researchers studying positive regulation of tumor necrosis factor-mediated signaling pathway-related genes often need to determine whether a candidate gene is causally involved in enhancing or dampening the pathway. EDITGENE provides comprehensive CRISPR services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of tumor necrosis factor-mediated signaling pathway research.
Frequently Asked Questions About positive regulation of tumor necrosis factor-mediated signaling pathway
What is GO:1903265?
GO:1903265 is the Gene Ontology term for positive regulation of tumor necrosis factor-mediated signaling pathway, describing any process that activates or increases TNF signaling.
What genes are involved in positive regulation of TNF-mediated signaling?
Genes such as TNF, CD4, PDGF-BB, bFGF, and FAM83A have been linked to this process.
How is TNF-mediated signaling positively regulated?
Positive regulation can occur through increased ligand or receptor expression, enhanced adaptor complex formation, or activation of downstream kinases like IKK and MAPKs.
What diseases are associated with dysregulated TNF signaling?
Steroid-induced necrosis of the femoral head, cancer progression, and radiation-induced intestinal injury are associated with altered TNF signaling.
What methods are used to study GO:1903265?
CRISPR screens, RNA-seq, proteomics, and apoptosis assays are commonly used.
Can CRISPR knockout help identify positive regulators of TNF signaling?
Yes, genome-wide CRISPR knockout screens can identify genes whose loss reduces TNF signaling, revealing positive regulators.
What is the role of CD4 in TNF-mediated apoptosis?
CD4 expression regulates susceptibility to Fas ligand- and TNF-mediated apoptosis.
How do PDGF-BB and bFGF affect TNF signaling?
They ameliorate radiation-induced intestinal apoptosis via Akt/p53 signaling, which intersects with TNF pathways.
What is FAM83A's connection to TNF signaling?
FAM83A promotes tumor cell proliferation and metastasis and may enhance TNF-mediated signaling in cervical cancer.
How can EDITGENE help my research on TNF signaling?
EDITGENE offers CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services to study positive regulators of TNF signaling.
Conclusion
GO:1903265, positive regulation of tumor necrosis factor-mediated signaling pathway, is a critical biological process that amplifies inflammatory and apoptotic responses. Its dysregulation contributes to diseases ranging from osteonecrosis to cancer. By leveraging CRISPR technologies and multi-omics methods, researchers can identify and validate positive regulators, opening new avenues for therapeutic intervention. EDITGENE provides the tools and expertise to accelerate these discoveries.
References
- 1. Ren G et al.. 2024. Differential Gene Expression and Immune Cell Infiltration in Patients with Steroid-induced Necrosis of the Femoral Head.. Endocr Metab Immune Disord Drug Targets 24(12):1377-1394 PMID: 38204239
- 2. Algeciras A et al.. 1998. CD4 regulates susceptibility to Fas ligand- and tumor necrosis factor-mediated apoptosis.. J Exp Med 187(5):711-20 PMID: 9480981
- 3. Liu Z et al.. 2014. PDGF-BB and bFGF ameliorate radiation-induced intestinal progenitor/stem cell apoptosis via Akt/p53 signaling in mice.. Am J Physiol Gastrointest Liver Physiol 307(11):G1033-43 PMID: 25301184
- 4. Lee TH et al.. 2019. Human Placenta Hydrolysate Promotes Liver Regeneration via Activation of the Cytokine/Growth Factor-Mediated Pathway and Anti-oxidative Effect.. Biol Pharm Bull 42(4):607-616 PMID: 30930420
- 5. Liu T et al.. 2021. Family with sequence similarity 83 member A promotes tumor cell proliferation and metastasis and predicts poor prognosis in cervical cancer.. Pathol Res Pract 222:153450 PMID: 33962175
