GO:0002429 immune response-activating cell surface receptor signaling pathway: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0002429 describes the molecular signaling cascade triggered when an extracellular ligand binds a cell surface receptor and leads to activation or perpetuation of an immune response.
• This term is a biological process that sits at the interface of innate and adaptive immunity, encompassing receptor-proximal events such as phosphorylation, adaptor recruitment, and transcription factor activation.
• Key receptor families include T cell receptors, B cell receptors, cytokine receptors, and pattern-recognition receptors, all of which can initiate immune response-activating signaling.
• Dysregulation of this pathway is linked to cancer immune evasion, chronic inflammation, and variable responses to immunotherapy.
• Transcriptomic and single-cell studies have identified genes such as ABI3BP, PD-L1 pathway components, and calpains as modulators of immune response-activating signaling in tumors.
• CRISPR knockout, knock-in, and overexpression models are essential for causally testing candidate genes within this pathway.
Description
The Gene Ontology term GO:0002429, immune response-activating cell surface receptor signaling pathway, defines the series of molecular signals initiated by an extracellular ligand binding to a receptor on the surface of a cell, leading to the activation or perpetuation of an immune response. This process is fundamental to how organisms detect pathogens, damaged cells, and foreign antigens, and how they coordinate cellular and humoral immunity. Researchers studying immunology, oncology, and infectious disease rely on this term to annotate genes and pathways that convert extracellular cues into intracellular signaling cascades. The pathway encompasses signaling downstream of T cell receptors, B cell receptors, cytokine receptors, and innate immune receptors, and it often converges on transcription factors such as NF-kB and IRF family members. Because many immunotherapies aim to boost or block these signals, understanding the genes and mechanisms annotated to GO:0002429 is directly relevant to drug discovery and biomarker development. Transcriptomic profiling of patient cohorts has revealed that expression of immune response-activating genes correlates with response to chemo-immunotherapy and with prognosis in multiple cancer types. This article synthesizes authoritative QuickGO annotation data with published literature to provide a research-grade overview of GO:0002429, including its definition, core mechanisms, key genes, disease associations, and experimental methods for functional validation.
immune response-activating cell surface receptor signaling pathway At A Glance
| GO ID | GO:0002429 |
|---|---|
| GO term | immune response-activating cell surface receptor signaling pathway |
| Ontology | biological_process |
| Synonym | activation of immune response by cell surface receptor signaling pathway; immune response-activating cell surface receptor signalling pathway |
| Major function | Transduces extracellular ligand binding at the cell surface into intracellular signals that activate or perpetuate an immune response. |
| Receptor classes involved | T cell receptors, B cell receptors, cytokine receptors, and pattern-recognition receptors. |
| Downstream effectors | NF-kB, IRF, and other transcription factors that drive immune gene expression. |
| Disease relevance | Cancer immunotherapy response, chronic inflammation, and autoimmune conditions. |
What Is GO:0002429?
GO:0002429 is a biological process term that describes the molecular signaling events that begin when an extracellular ligand binds to a receptor on the cell surface and culminate in the activation or perpetuation of an immune response. It includes receptor-proximal signaling, adaptor protein recruitment, kinase activation, and downstream transcriptional changes that collectively amplify or sustain immune cell activity.
Why Is immune response-activating cell surface receptor signaling pathway Important in Cell Biology?
GO:0002429 is important because it provides a standardized framework for annotating and interpreting the signaling events that convert extracellular immune cues into cellular responses. This process is central to vaccine efficacy, cancer immunotherapy, and host defense, and its dysregulation contributes to immune evasion and inflammatory pathology. By studying genes annotated to this term, researchers can identify biomarkers of immunotherapy response and potential therapeutic targets.
• Defines the signaling cascade that activates immune responses upon ligand binding to cell surface receptors.
• Encompasses signaling downstream of T cell receptors, B cell receptors, and innate immune receptors.
• Correlates with response to neoadjuvant chemo-immunotherapy in solid tumors.
• Involves genes such as ABI3BP that are associated with immune infiltration and prognosis in lung cancer.
• Includes PD-L1 pathway components that influence radiosensitivity in gastric cancer.
• Calpain family genes within this pathway are linked to immune infiltration in pancreatic cancer.
• Provides a basis for CRISPR knockout and knock-in studies to causally test immune signaling genes.
• Supports transcriptomic biomarker discovery for seasonal influenza susceptibility.
• Helps interpret single-cell profiling data in tumor immunology.
• Guides development of targeted immunotherapies and combination regimens.
What Happens During immune response-activating cell surface receptor signaling pathway?
Ligand binding and receptor engagement
In simple terms: An immune signal molecule docks onto a receptor on the cell surface, like a key fitting a lock.
The pathway begins when an extracellular ligand, such as a cytokine, antigen, or pathogen-associated molecule, binds to a cell surface receptor. This binding induces receptor conformational changes or oligomerization, which is the first step in transmitting the immune activation signal into the cell.
Receptor-proximal phosphorylation and adaptor recruitment
In simple terms: The receptor tags itself and nearby proteins with phosphate groups to assemble a signaling team.
Upon ligand binding, receptor-associated kinases phosphorylate tyrosine residues on the receptor cytoplasmic domain, creating docking sites for adaptor proteins. These adaptors nucleate a signaling complex that includes kinases and scaffolding molecules, amplifying the initial signal.
Activation of downstream kinase cascades
In simple terms: A chain of molecular switches gets flipped, passing the message deeper into the cell.
Adaptor recruitment leads to activation of kinase cascades, including MAPK and NF-kB pathways, which propagate the signal from the membrane to the nucleus. These cascades involve sequential phosphorylation events that diversify and amplify the immune response.
Transcription factor activation and immune gene expression
In simple terms: The signal reaches the control center and turns on genes that fight infection or inflammation.
Kinase cascades activate transcription factors such as NF-kB and IRF family members, which translocate to the nucleus and induce expression of cytokines, chemokines, and co-stimulatory molecules. This transcriptional program perpetuates and shapes the immune response.
Feedback regulation and signal termination
In simple terms: The cell has brakes to stop the alarm once the threat is handled.
Negative regulators, including phosphatases and ubiquitin ligases, attenuate receptor signaling to prevent excessive immune activation. Dysregulation of these feedback mechanisms can lead to chronic inflammation or autoimmunity.
Key Genes Involved in GO:0002429 immune response-activating cell surface receptor signaling pathway
The following genes and proteins are experimentally or computationally implicated in immune response-activating cell surface receptor signaling pathways across published studies.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ABI3BP | Modulates immune infiltration and extracellular matrix interactions | Prognostic biomarker in lung cancer associated with immune cell infiltration |
| PD-L1 (CD274) | Immune checkpoint ligand that regulates T cell activation | Associated with radiosensitivity in gastric cancer and immunotherapy response |
| CALPAIN family (CAPN1, CAPN2, CAPN5, CAPN9) | Calcium-dependent proteases involved in immune signaling and cell migration | Prognostic value and immune infiltration in pancreatic cancer |
| HLA-DRA | Antigen presentation to CD4+ T cells | Identified in single-cell profiling of esophageal squamous cell carcinoma immunotherapy response |
| CD8A | T cell co-receptor for MHC class I antigen recognition | Marker of cytotoxic T cell infiltration in tumor immune profiling |
| IFNG | Cytokine that amplifies immune response signaling | Correlates with immunotherapy response in esophageal cancer |
| CXCL9 | Chemokine that recruits T cells to tumors | Associated with immune activation in tumor microenvironment |
| CXCL10 | Chemokine that recruits activated T cells | Immune response biomarker in cancer immunotherapy |
| GZMB | Granzyme B mediates cytotoxic T cell killing | Effector molecule downstream of immune receptor signaling |
| PRF1 | Perforin facilitates cytotoxic granule delivery | Cytotoxic effector in anti-tumor immunity |
| STAT1 | Transcription factor downstream of cytokine receptors | Central mediator of interferon signaling and immune activation |
| NFKB1 | Transcription factor activated by immune receptor signaling | Drives expression of pro-inflammatory and immune genes |
| IRF1 | Interferon regulatory factor | Regulates immune response genes downstream of receptor signaling |
| TNF | Pro-inflammatory cytokine | Effector of immune activation with prognostic relevance |
| IL6 | Cytokine that perpetuates immune and inflammatory responses | Associated with tumor microenvironment immune signaling |
| CCL5 | Chemokine for T cell recruitment | Immune infiltration marker in cancer |
| CD274 (PD-L1) | Checkpoint ligand | Target of immunotherapy and radiosensitivity studies |
| ABI3BP (repeat) | Immune-related extracellular protein | Lung tumor prognosis and immune infiltration |
How Is immune response-activating cell surface receptor signaling pathway Regulated?
The immune response-activating cell surface receptor signaling pathway is tightly regulated by positive and negative feedback loops. Phosphatases and ubiquitin ligases attenuate receptor-proximal signals to prevent excessive immune activation. Transcription factors such as STAT1 and NF-kB induce both effector molecules and their own negative regulators, creating self-limiting circuits. In cancer, checkpoint molecules like PD-L1 dampen T cell receptor signaling, and their expression is associated with radiosensitivity and immunotherapy response. Calpain-mediated proteolysis can modulate signaling components and immune cell migration, as suggested by prognostic studies in pancreatic cancer.
immune response-activating cell surface receptor signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ABI3BP | Lung cancer prognosis and immune infiltration | Knockout in lung cancer cell lines followed by immune infiltration assays |
| PD-L1 (CD274) | Gastric cancer radiosensitivity | Knock-in reporter or knockout in gastric cancer cells for radiation response |
| CALPAIN family | Pancreatic cancer immune microenvironment | CRISPR knockout of CAPN genes in pancreatic cancer organoids |
| IFNG | Esophageal cancer immunotherapy response | Overexpression or knockout in T cell co-culture models |
| STAT1 | Interferon signaling in cancer | Point mutation knock-in to test phosphorylation sites |
Cancer immunotherapy response
Single-cell profiling of esophageal squamous cell carcinoma revealed that immune response-activating signaling genes correlate with response to neoadjuvant chemo-immunotherapy. Genes such as IFNG, CXCL9, and GZMB, which are downstream of cell surface receptor signaling, serve as markers of activated tumor-infiltrating lymphocytes. ABI3BP expression is associated with immune infiltration and prognosis in lung cancer, highlighting the clinical relevance of this pathway.
Gastric cancer radiosensitivity
Genes involved in the PD-L1 pathway, a key component of immune response-activating cell surface receptor signaling, are associated with radiosensitivity in gastric cancer patients. This suggests that manipulating this pathway could enhance radiotherapy efficacy.
Pancreatic cancer immune microenvironment
Comprehensive analysis of calpain family genes, which participate in immune signaling, revealed prognostic value and correlation with immune infiltration in pancreatic cancer. These findings link the pathway to tumor immune microenvironment regulation.
Infectious disease susceptibility
Baseline blood transcriptome analysis identified immune response-activating signaling signatures associated with susceptibility to seasonal influenza A/H3N2. This demonstrates the pathway's role in host defense against viral infections.
From immune response-activating cell surface receptor signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ABI3BP alter immune cell recruitment? | ABI3BP knockout in lung cancer cell lines |
| Does PD-L1 expression modulate radiosensitivity? | PD-L1 knockout or overexpression in gastric cancer cells |
| Do calpain proteases regulate immune infiltration? | CRISPR knockout of CAPN genes in pancreatic cancer models |
| Does IFNG signaling enhance immunotherapy response? | IFNG knockout or knock-in in esophageal cancer organoids |
| Can STAT1 phosphorylation mutants affect immune gene expression? | Point mutation knock-in of STAT1 in immune cells |
| Does overexpression of chemokines recruit T cells? | CXCL9/CXCL10 overexpression in tumor cells |
How to Study the immune response-activating cell surface receptor signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Single-cell RNA-seq | Gene expression at single-cell resolution | Identifying immune cell subsets in tumor immunotherapy response |
| Bulk RNA-seq | Transcriptome-wide gene expression | Biomarker discovery in cancer and infectious disease |
| ESTIMATE algorithm | Immune and stromal scores from expression data | Correlating immune infiltration with gene expression in tumors |
| CRISPR knockout screen | Gene requirement for a phenotype | Identifying essential immune signaling genes |
| Phospho-proteomics | Protein phosphorylation states | Mapping receptor-proximal signaling events |
| Flow cytometry | Cell surface and intracellular protein levels | Validating immune cell activation markers |
| Immunohistochemistry | Protein localization in tissue | Assessing immune infiltration in patient samples |
| Multiplex cytokine assays | Secreted cytokine levels | Measuring immune response activation in vitro |
Single-cell RNA sequencing
Single-cell profiling allows researchers to dissect immune response-activating signaling at the resolution of individual cells within tumors, revealing which cell types express key receptors and downstream effectors. This method has been used to identify immune cell subsets associated with immunotherapy response in esophageal cancer.
Bulk transcriptomic profiling
Bulk RNA sequencing of patient cohorts can identify gene expression signatures associated with immune response activation, as demonstrated in studies of influenza susceptibility and lung cancer prognosis. These signatures can serve as biomarkers for disease outcome or treatment response.
Immune infiltration estimation
Computational algorithms such as ESTIMATE and CIBERSORT infer immune cell composition from transcriptomic data, enabling correlation of immune response-activating gene expression with immune infiltration in tumors. This approach has been applied to testicular and pancreatic cancers.
Functional validation with CRISPR screens
CRISPR knockout and activation screens can systematically test which genes in the immune response-activating pathway are required for immune cell activation or tumor cell killing. These screens provide causal evidence linking specific genes to pathway function.
How CRISPR Can Be Used to Study GO:0002429 immune response-activating cell surface receptor signaling pathway
Knockout
CRISPR knockout of genes such as ABI3BP, PD-L1, or calpain family members can determine whether they are required for immune response-activating signaling in cancer cells. Knockout models help establish causal roles in immune evasion or therapy response.
Point Mutation
Point mutation knock-in can be used to test the functional impact of specific phosphorylation sites or disease-associated variants in signaling molecules like STAT1. This approach reveals how single amino acid changes alter immune signaling output.
Knock-in
Knock-in of reporter tags or fluorescent proteins into endogenous loci allows real-time monitoring of immune response-activating gene expression and protein localization. Tagged knock-in models are valuable for tracking receptor trafficking and signaling dynamics.
Overexpression
Overexpression of chemokines such as CXCL9 or cytokines like IFNG can enhance immune cell recruitment and activation in tumor models. Overexpression studies complement knockout approaches by testing gain-of-function effects.
How EDITGENE Supports immune response-activating cell surface receptor signaling pathway Research
Researchers studying immune response-activating cell surface receptor signaling pathway-related genes often need to determine whether a candidate gene is causally involved in immune activation or disease progression. EDITGENE provides comprehensive CRISPR-based services to enable such functional studies.
Contact EDITGENE today to design your custom CRISPR model for immune response-activating cell surface receptor signaling pathway research.
Frequently Asked Questions About immune response-activating cell surface receptor signaling pathway
What is GO:0002429?
GO:0002429 is the Gene Ontology term for immune response-activating cell surface receptor signaling pathway, defined as the series of molecular signals initiated by an extracellular ligand binding to a cell surface receptor, leading to activation or perpetuation of an immune response.
What genes are involved in immune response-activating cell surface receptor signaling pathway?
Genes include ABI3BP, PD-L1 (CD274), calpain family members, STAT1, NFKB1, IFNG, CXCL9, CXCL10, GZMB, and PRF1, among others.
How is immune response-activating cell surface receptor signaling pathway regulated?
It is regulated by phosphorylation and dephosphorylation events, ubiquitin-mediated degradation, and feedback loops involving transcription factors such as STAT1 and NF-kB.
What diseases are associated with GO:0002429?
Dysregulation is associated with cancer immunotherapy response, gastric cancer radiosensitivity, pancreatic cancer immune microenvironment, and susceptibility to influenza A/H3N2.
What methods are used to study immune response-activating cell surface receptor signaling?
Common methods include single-cell RNA-seq, bulk RNA-seq, CRISPR knockout screens, phospho-proteomics, flow cytometry, and immune infiltration estimation algorithms.
How can CRISPR be used to study this pathway?
CRISPR knockout, point mutation knock-in, tagged knock-in, and overexpression models allow causal testing of genes involved in immune response activation.
What is the role of PD-L1 in this pathway?
PD-L1 is an immune checkpoint ligand that modulates T cell receptor signaling and is associated with radiosensitivity in gastric cancer.
What is the role of ABI3BP in immune response signaling?
ABI3BP is associated with immune infiltration and prognosis in lung cancer, suggesting a role in modulating immune response-activating pathways.
How do calpains contribute to immune response-activating signaling?
Calpain family proteases are involved in immune signaling and cell migration, and their expression correlates with immune infiltration in pancreatic cancer.
What cell models are suitable for studying GO:0002429?
Knockout, point mutation, knock-in, and overexpression cell models in cancer cell lines, immune cells, and organoids are suitable for functional studies.
Conclusion
GO:0002429, immune response-activating cell surface receptor signaling pathway, is a central biological process that converts extracellular immune cues into cellular activation programs. Its components are implicated in cancer immunotherapy response, infectious disease susceptibility, and inflammatory pathology. Understanding the genes and mechanisms within this pathway provides a foundation for biomarker discovery and therapeutic targeting. CRISPR-based functional genomics, combined with transcriptomic and proteomic profiling, offers powerful tools to dissect this pathway and identify causal drivers of immune activation. EDITGENE's services support these efforts by providing customizable knockout, knock-in, overexpression, and screening models for immune signaling research.
References
- 1. Ji G et al.. 2024. Single-cell profiling of response to neoadjuvant chemo-immunotherapy in surgically resectable esophageal squamous cell carcinoma.. Genome Med 16(1):49 PMID: 38566201
- 2. Feng Y et al.. 2022. ABI3BP is a prognosis biomarker related with clinicopathological features and immunity infiltration of lung tumor.. Front Genet 13:1085785 PMID: 36744181
- 3. Tang J et al.. 2022. Susceptibility identification for seasonal influenza A/H3N2 based on baseline blood transcriptome.. Front Immunol 13:1048774 PMID: 36713410
- 4. Ke ZB et al.. 2021. Identification of novel genes in testicular cancer microenvironment based on ESTIMATE algorithm-derived immune scores.. J Cell Physiol 236(1):706-713 PMID: 32617980
- 6. Du Z et al.. 2020. Genes Involved in the PD-L1 Pathway Might Associate with Radiosensitivity of Patients with Gastric Cancer.. J Oncol 2020:7314195 PMID: 32963532
- 7. Lan C et al.. 2021. Comprehensive analysis of prognostic value and immune infiltration of calpains in pancreatic cancer.. J Gastrointest Oncol 12(6):2600-2621 PMID: 35070391
