GO:0051712 positive regulation of killing of cells of another organism: Immune Cytotoxicity Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0051712 describes any process that activates or increases the frequency, rate or extent of killing by an organism of cells in another organism.
• The term is a biological_process child of positive regulation of killing of cells of another organism and is widely used to annotate host immune effector mechanisms and microbial antagonism [2,8].
• CD8+ T cells, innate lymphoid cells, macrophages and CAR-macrophages are major experimental systems for studying this process [2,3,5].
• Key molecular mediators include cytotoxic granule proteins, death receptor ligands, chemokines such as CXCL10, and checkpoint molecules such as LAG3 and CD24 [1,5,6].
• Loss-of-function and gain-of-function CRISPR models are the standard approach to test whether a candidate gene causally regulates killing of target cells [5,6].
• The term is relevant to cancer immunotherapy, infectious disease, and host-microbe interaction research [1,3,8].
Description
GO:0051712, positive regulation of killing of cells of another organism, is a Gene Ontology biological_process term defined as any process that activates or increases the frequency, rate or extent of the killing by an organism of cells in another organism. It captures the regulatory arm of inter-organism cytotoxicity, in which an effector cell or organism actively enhances the destruction of target cells belonging to a different organism. This includes immune effector mechanisms such as CD8+ T cell and innate lymphoid cell cytotoxicity, as well as microbial antagonism systems that eliminate competing or competent cells [2,3,8]. The term is therefore central to understanding how hosts control pathogens and tumors, and how microbes shape their communities. Because the process is defined by its regulatory outcome rather than by a single molecular mechanism, it integrates signals from chemokine networks, antigen presentation, death receptor pathways, and cytotoxic granule release [1,3,6]. Researchers use GO:0051712 to annotate experiments in which a gene, cell type, or treatment increases target cell death across organismal boundaries. Accurate annotation requires evidence that the killing is directed at cells of another organism and that the annotated factor increases, rather than merely permits, that killing [2,8]. This makes the term a precise tool for comparative immunology, cancer immunotherapy, and microbiome research.
positive regulation of killing of cells of another organism At A Glance
| GO ID | GO:0051712 |
|---|---|
| GO term | positive regulation of killing of cells of another organism |
| Ontology | biological_process |
| Definition | Any process that activates or increases the frequency, rate or extent of the killing by an organism of cells in another organism. |
| Synonym | activation of killing of cells of another organism; enhancement of other organism programmed cell death by organism; stimulation of killing of cells of another organism; up regulation of killing of cells of another organism |
| Major function | Enhancement of inter-organism cytotoxic activity, including immune effector killing of infected or transformed cells and microbial antagonism. |
| Related processes | CD8+ T cell cytotoxicity, innate lymphoid cell activation, macrophage bactericidal activity, contact-dependent growth inhibition. |
| Experimental readouts | Target cell lysis assays, granzyme/perforin detection, chemokine profiling, bacterial killing assays. |
What Is GO:0051712?
In plain terms, GO:0051712 covers any biological process that boosts the ability of one organism to kill cells belonging to a different organism. The QuickGO definition states that it is any process that activates or increases the frequency, rate or extent of the killing by an organism of cells in another organism. It is a positive regulatory term, meaning the annotated gene or process must enhance killing rather than simply be required for it. The term belongs to the biological_process ontology and includes synonyms such as activation of killing of cells of another organism, enhancement of other organism programmed cell death by organism, and stimulation of killing of cells of another organism.
Why Is positive regulation of killing of cells of another organism Important in Cell Biology?
GO:0051712 matters because it formalizes the regulatory logic of inter-organism killing, a process that underlies protective immunity, immunotherapy efficacy, and microbial competition. In cancer, enhancing CD8+ T cell and innate lymphoid cell killing of tumor cells is the goal of checkpoint blockade, bispecific engagers, and CAR-macrophage therapies [1,3,5,6]. In infectious disease, the same term describes how macrophages and other effectors increase bactericidal activity against pathogens. In microbiology, it captures contact-dependent killing of competent cells that shapes genetic exchange and community structure. Because the term is regulatory, it directs researchers to distinguish factors that increase killing from those that are merely required for it, which is essential for target prioritization in drug and cell therapy development [2,5].
• Provides a standardized annotation for experiments that enhance immune-mediated killing of tumor cells [1,3].
• Supports mechanistic studies of CD8+ T cell cytotoxicity across tissues and virus specificities.
• Links chemokine networks such as CXCL10 to improved anti-tumor immunity.
• Enables annotation of macrophage bactericidal enhancement in reproductive and other tissues.
• Captures microbial antagonism systems that kill competent cells and limit horizontal gene transfer.
• Guides development of bispecific aptamers and checkpoint inhibitors that boost T cell killing.
• Helps interpret CAR-macrophage therapies that potentiate killing of hepatocellular carcinoma cells.
• Facilitates cross-species comparison of cytotoxic effector mechanisms [2,3].
• Informs vaccine and adjuvant strategies that aim to increase effector killing.
• Supports functional genomics screens for regulators of inter-organism cytotoxicity [5,6].
What Happens During positive regulation of killing of cells of another organism?
Recognition and effector-target engagement
In simple terms: The killer cell first has to find and physically engage the target cell from another organism.
Positive regulation of killing begins with recognition of target cells by effector cells. CD8+ T cells recognize antigen through their T cell receptor, and their cytotoxic capacity is shaped by tissue origin and virus specificity. Innate lymphoid cells can cross-present antigen to facilitate activation of antitumor CD8+ T cells, thereby increasing the pool of effectors capable of killing target cells. Bispecific aptamers that simultaneously bind LAG3 and HER2 enhance T cell-mediated immunotherapy against HER2-positive cancer cells, illustrating how engagement molecules can positively regulate killing.
Chemokine-driven recruitment and amplification
In simple terms: Chemical signals call more killer cells to the target site and make them more active.
Chemokines such as CXCL10 regulate the recruitment and activity of CD8+ T cells. Huang-Jin-Shuang-Shen decoction promotes CD8+ T-cell-mediated anti-tumor immunity by regulating chemokine CXCL10 in gastric cancer, providing evidence that chemokine modulation can positively regulate killing of tumor cells. This step amplifies the number and activation state of effectors, converting a weak response into an effective killing program.
Cytotoxic granule and death receptor execution
In simple terms: The killer cell releases toxic packets or death signals that make the target cell die.
Once engaged, effector cells deliver cytotoxic granules and death receptor ligands to target cells. Human CD8+ T cell cytotoxicity varies with tissue origin and virus specificity, indicating that execution programs are context-dependent. In macrophages, bactericidal activity against another organism is a measurable output of this execution phase. The regulatory term GO:0051712 is used when a factor increases the frequency or extent of this execution step.
Checkpoint and metabolic modulation
In simple terms: Brakes and fuel signals inside the killer cell can be adjusted to make killing stronger.
Checkpoint molecules and metabolic regulators tune the intensity of killing. USP22 inhibition potentiates GPC3 chimeric antigen receptor macrophage efficacy in hepatocellular carcinoma by downregulating tumor CD24 expression, showing that modulating a checkpoint-like surface protein can positively regulate killing. Bispecific aptamers targeting LAG3 and HER2 similarly enhance T cell-mediated killing of HER2-positive cancer cells. These examples illustrate that positive regulation can occur by removing inhibitory signals or by adding activating engagements.
Microbial antagonism and contact-dependent killing
In simple terms: Bacteria can also kill cells of another organism, for example to eliminate competitors.
In microbes, ComI inhibits transformation in Bacillus subtilis by selectively killing competent cells, a clear example of one organism increasing killing of cells of another organism. This process is studied with bacterial competition assays and is annotated to GO:0051712 when the factor increases the rate or extent of target cell death. Such systems are important for understanding horizontal gene transfer control and microbiome dynamics.
Key Genes Involved in GO:0051712 positive regulation of killing of cells of another organism
The following genes and proteins are experimentally linked to positive regulation of killing of cells of another organism, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CXCL10 | Chemokine that recruits and activates CD8+ T cells | Regulated by Huang-Jin-Shuang-Shen decoction in gastric cancer |
| CD8A | T cell co-receptor for MHC class I antigen recognition | Central to CD8+ T cell cytotoxicity across tissues |
| LAG3 | Inhibitory checkpoint receptor on T cells | Targeted by bispecific aptamers to enhance T cell killing |
| HER2 | Receptor tyrosine kinase tumor antigen | Target of bispecific aptamer in HER2-positive cancer |
| CD24 | Surface molecule with checkpoint-like function | Downregulated by USP22 inhibition in CAR-macrophage therapy |
| USP22 | Deubiquitinase that regulates gene expression | Inhibition potentiates CAR-macrophage efficacy |
| GPC3 | Hepatocellular carcinoma antigen | Target of CAR-macrophage therapy |
| ComI | Peptide that kills competent Bacillus subtilis cells | Model of contact-dependent microbial antagonism |
| ILC2 | Innate lymphoid cells that cross-present antigen | Facilitate activation of antitumor CD8+ T cells |
| Perforin | Pore-forming protein in cytotoxic granules | Effector molecule in target cell killing |
| Granzyme B | Serine protease in cytotoxic granules | Mediates target cell apoptosis |
| FasL | Death receptor ligand | Induces apoptosis in target cells |
| TNF | Cytokine that can promote target cell death | Context-dependent regulator of killing |
| IFN-gamma | Cytokine that enhances antigen presentation and killing | Supports CD8+ T cell effector function |
| MHC class I | Presents antigen to CD8+ T cells | Required for antigen-specific killing |
| Calcium channels | Mediate calcium signaling in effector cells | Calcium signaling orchestrates glioblastoma development and may influence killing |
| Macrophage receptors | Recognize and kill bacterial targets | Bactericidal activity of testicular macrophages |
How Is positive regulation of killing of cells of another organism Regulated?
Positive regulation of killing of cells of another organism is controlled at multiple levels. Chemokine signaling, exemplified by CXCL10, recruits and activates CD8+ T cells and can be modulated by pharmacological agents such as Huang-Jin-Shuang-Shen decoction. Checkpoint molecules including LAG3 and CD24 act as brakes; their inhibition or downregulation enhances killing [5,6]. Antigen cross-presentation by innate lymphoid cells increases the activation of antitumor CD8+ T cells, providing an upstream regulatory node. Calcium signaling is a broad regulator of cell behavior and has been implicated in glioblastoma development, suggesting that calcium-dependent pathways may influence cytotoxic effector functions in some contexts. In bacteria, ComI selectively kills competent cells, and its expression is tied to the competence program, illustrating genetic regulation of antagonistic killing.
positive regulation of killing of cells of another organism and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CXCL10 | Gastric cancer anti-tumor immunity | Knockout or overexpression in gastric cancer cell lines co-cultured with CD8+ T cells |
| LAG3 | HER2-positive cancer immunotherapy | Point mutation or knockout in T cells followed by bispecific aptamer treatment |
| CD24 | Hepatocellular carcinoma CAR-macrophage therapy | Knockdown or knockout in tumor cells to test CAR-macrophage killing |
| USP22 | Hepatocellular carcinoma | Knockout or inhibitor treatment in CAR-macrophage models |
| ComI | Bacterial competence and transformation | Knockout of comI in Bacillus subtilis and competition assays |
Cancer immunotherapy
Enhancing the killing of tumor cells by immune effectors is a major therapeutic goal. Huang-Jin-Shuang-Shen decoction promotes CD8+ T-cell-mediated anti-tumor immunity by regulating CXCL10 in gastric cancer. Innate lymphoid cells can cross-present antigen to activate antitumor CD8+ T cells, expanding the effector pool. Bispecific aptamers targeting LAG3 and HER2 enhance T cell-mediated immunotherapy against HER2-positive cancer cells. USP22 inhibition potentiates GPC3 CAR-macrophage efficacy in hepatocellular carcinoma by downregulating tumor CD24. These studies directly inform strategies to positively regulate killing of cancer cells.
Infectious disease and host defense
Macrophages contribute to bactericidal activity against another organism, as shown for testicular macrophages. CD8+ T cell cytotoxicity is shaped by tissue origin and virus specificity, which has implications for vaccine design and antiviral immunity. Understanding positive regulation of killing in these contexts can guide development of immunotherapies that boost pathogen clearance.
Microbial competition and horizontal gene transfer
ComI inhibits transformation in Bacillus subtilis by selectively killing competent cells, linking inter-organism killing to control of genetic exchange. This process is relevant to the spread of antibiotic resistance genes and to microbiome engineering.
Neurological and developmental contexts
Calcium signaling orchestrates glioblastoma development, and although direct links to inter-organism killing are not established, calcium-dependent pathways may modulate immune effector functions in the tumor microenvironment. This highlights the need for context-specific investigation.
From positive regulation of killing of cells of another organism-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X increase CD8+ T cell killing of tumor cells? | CRISPR knockout of gene X in T cells followed by co-culture with tumor targets |
| Does a point mutation in a checkpoint gene enhance killing? | Knock-in of the point mutation in T cells or tumor cells |
| Does overexpression of a chemokine boost anti-tumor immunity? | Overexpression of CXCL10 in tumor cells or stromal cells |
| Does a bacterial factor kill competent cells? | Knockout of comI in Bacillus subtilis and transformation assays |
| Does CAR-macrophage killing depend on a surface antigen? | Knockout of CD24 in hepatocellular carcinoma cells |
| Does innate lymphoid cell cross-presentation activate CD8+ T cells? | Knockout of antigen presentation machinery in ILC2s |
How to Study the positive regulation of killing of cells of another organism Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Flow-based cytotoxicity assay | Target cell lysis by effector cells | Quantify CD8+ T cell or CAR-macrophage killing [2,5] |
| ELISA/Luminex | Chemokine and cytokine concentrations | Measure CXCL10 regulation in gastric cancer |
| RNA-seq | Transcriptional changes in effectors and targets | Identify regulators of killing [1,5] |
| MHC tetramer staining | Antigen-specific T cell frequency | Assess cross-presentation by ILC2s |
| Bacterial competition assay | Killing of competent cells | Test ComI function in Bacillus subtilis |
| Calcium imaging | Intracellular calcium flux | Probe signaling in effector cells |
| CRISPR knockout screening | Gene requirement for killing | Identify positive regulators of cytotoxicity [5,6] |
| Western blot | Protein expression and modification | Validate USP22 or CD24 changes |
Cytotoxicity assays
Standard chromium release or flow-based killing assays measure the frequency and extent of target cell death. These are used to quantify positive regulation of killing by CD8+ T cells, CAR-macrophages, or bacterial effectors [2,5,8].
Chemokine and cytokine profiling
ELISA, Luminex, or RNA-seq can quantify CXCL10 and other chemokines that recruit and activate effectors. This approach was used to show that Huang-Jin-Shuang-Shen decoction regulates CXCL10 in gastric cancer.
Antigen presentation and cross-presentation assays
Flow cytometry and MHC tetramer staining assess antigen cross-presentation by innate lymphoid cells and subsequent CD8+ T cell activation.
Bacterial competition and transformation assays
Competition assays and transformation efficiency measurements test whether ComI or other factors kill competent Bacillus subtilis cells.
Calcium imaging and signaling assays
Calcium indicators and signaling inhibitors can probe the role of calcium pathways in effector cell function, as reviewed in the context of glioblastoma.
How CRISPR Can Be Used to Study GO:0051712 positive regulation of killing of cells of another organism
Knockout
CRISPR knockout is used to remove candidate genes and test whether they are required for positive regulation of killing. For example, knocking out CD24 in hepatocellular carcinoma cells can test whether its loss enhances CAR-macrophage killing. Knocking out LAG3 or HER2 in target cells can validate bispecific aptamer specificity.
Point Mutation
Point mutations can mimic activating or inactivating alleles in checkpoint or signaling genes. For instance, introducing a point mutation in LAG3 or HER2 may alter T cell-mediated killing and help map functional domains. Point mutations in calcium signaling genes could test their role in effector function.
Knock-in
Knock-in of reporter tags or epitope tags allows tracking of effector molecules such as perforin or granzyme B. Knock-in of a chemokine like CXCL10 under a constitutive promoter can test whether increased expression enhances anti-tumor immunity.
Overexpression
Overexpression of positive regulators, such as CXCL10 or activating forms of immune effectors, can boost killing of target cells. This approach is used to study gain-of-function effects in cancer immunotherapy models [1,3].
How EDITGENE Supports positive regulation of killing of cells of another organism Research
Researchers studying positive regulation of killing of cells of another organism-related genes often need to determine whether a candidate gene is causally involved in enhancing target cell death. EDITGENE provides CRISPR-based cell model services to support these investigations.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of killing of cells of another organism research.
Frequently Asked Questions About positive regulation of killing of cells of another organism
What is GO:0051712?
GO:0051712 is the Gene Ontology term for positive regulation of killing of cells of another organism, defined as any process that activates or increases the frequency, rate or extent of the killing by an organism of cells in another organism.
What genes are involved in positive regulation of killing of cells of another organism?
Genes include CXCL10, CD8A, LAG3, HER2, CD24, USP22, GPC3, and ComI, among others [1,5,6,8].
How is positive regulation of killing of cells of another organism studied?
It is studied using cytotoxicity assays, chemokine profiling, antigen presentation assays, and bacterial competition assays [1,2,3,8].
What is the role of CD8+ T cells in this process?
CD8+ T cells are major effectors that recognize and kill target cells, and their cytotoxicity is shaped by tissue origin and virus specificity.
How do chemokines regulate killing of target cells?
Chemokines such as CXCL10 recruit and activate CD8+ T cells, thereby increasing the frequency and extent of target cell killing.
Can bacteria positively regulate killing of other cells?
Yes, ComI inhibits transformation in Bacillus subtilis by selectively killing competent cells, which is an example of inter-organism killing.
What is the role of checkpoint molecules in this process?
Checkpoint molecules such as LAG3 and CD24 can inhibit killing; blocking or downregulating them enhances T cell and CAR-macrophage killing [5,6].
How are CRISPR models used to study this term?
CRISPR knockout, point mutation, knock-in, and overexpression models are used to test whether specific genes causally regulate killing of target cells [5,6].
What diseases are linked to positive regulation of killing of cells of another organism?
It is linked to cancer immunotherapy, infectious disease, and microbial competition, including gastric cancer, hepatocellular carcinoma, and HER2-positive cancers [1,5,6].
What services does EDITGENE provide for this research?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics services [1,5,6].
Conclusion
GO:0051712 provides a precise framework for annotating and investigating processes that enhance the killing of cells of another organism. From CD8+ T cell cytotoxicity and CAR-macrophage therapy to bacterial antagonism, this term connects diverse experimental systems under a common regulatory concept [1,2,5,8]. Researchers can leverage CRISPR models and functional assays to identify and validate positive regulators, accelerating the development of immunotherapies and antimicrobial strategies.
References
- 1. Yang C et al.. 2024. Huang-Jin-Shuang-Shen Decoction promotes CD8+ T-cell-mediated anti-tumor immunity by regulating chemokine CXCL10 in gastric cancer.. Phytomedicine 135:156065 PMID: 39341128
- 2. Niessl J et al.. 2025. Tissue origin and virus specificity shape human CD8(+) T cell cytotoxicity.. Sci Immunol 10(109):eadq4881 PMID: 40680144
- 3. Kim J et al.. 2025. Antigen Cross-Presentation by Type-2 Innate Lymphoid Cells Facilitates the Activation of Antitumor CD8+ T Cells.. Cancer Res 85(14):2659-2678 PMID: 40245114
- 4. Leclerc C et al.. 2016. Calcium signaling orchestrates glioblastoma development: Facts and conjunctures.. Biochim Biophys Acta 1863(6 Pt B):1447-59 PMID: 26826650
- 5. Pan J et al.. 2026. USP22 inhibition potentiates GPC3 chimeric antigen receptor macrophages efficacy in hepatocellular carcinoma by downregulating tumor CD24 expression.. Cancer Lett 655:218593 PMID: 42155697
- 6. Guo R et al.. 2025. A novel bispecific aptamer targeting LAG3 and HER2 enhances T cell-mediated immunotherapy against HER2-positive cancer cells.. Front Immunol 16:1557910 PMID: 40761795
- 7. Wei RQ et al.. 1988. Bactericidal activity of testicular macrophages.. Biol Reprod 38(4):830-5 PMID: 2840982
- 8. Smith DR et al.. 2024. ComI inhibits transformation in Bacillus subtilis by selectively killing competent cells.. J Bacteriol 206(7):e0041323 PMID: 38874341
