GO:0032661 regulation of interleukin-18 production: Immune Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0032661 (regulation of interleukin-18 production) is a biological process that modulates the frequency, rate, or extent of interleukin-18 (IL-18) production, encompassing its biosynthesis and secretion.
• IL-18 is a pleiotropic cytokine that induces interferon-gamma production and bridges innate and adaptive immunity.
• Dysregulated IL-18 production is implicated in cancer immune escape, autoimmune diseases, allergic inflammation, and liver injury.
• Key regulatory nodes include inflammasome signaling, post-transcriptional splicing (e.g., PTBP3-mediated exon skipping), and cytokine networks involving IL-12.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal dissection of genes controlling IL-18 production.
• Understanding GO:0032661 offers therapeutic opportunities in immuno-oncology, autoimmunity, and inflammatory diseases.
Description
Interleukin-18 (IL-18) is a member of the IL-1 superfamily that was originally identified as an interferon-gamma-inducing factor. It is produced by a variety of immune and non-immune cells and plays a central role in both innate and adaptive immune responses. The production of IL-18 is tightly regulated at multiple levels, including transcription, inflammasome-mediated processing, and secretion. The Gene Ontology term GO:0032661, regulation of interleukin-18 production, captures any process that modulates the frequency, rate, or extent of IL-18 production. This term is essential for annotating gene functions in inflammatory pathways and for understanding how perturbations in IL-18 regulation contribute to disease. Researchers studying this process aim to identify the molecular players that control IL-18 levels, as these represent potential therapeutic targets in cancer, autoimmunity, and allergic diseases.
regulation of interleukin-18 production At A Glance
| GO ID | GO:0032661 |
|---|---|
| GO term | regulation of interleukin-18 production |
| Ontology | biological_process |
| Synonym | regulation of IL-18 production; regulation of interleukin-18 biosynthetic process; regulation of interleukin-18 secretion |
| Major function | Modulates the frequency, rate, or extent of interleukin-18 production, influencing immune responses and inflammation. |
| Related cytokines | IL-18, IL-12, interferon-gamma. |
| Key regulatory mechanisms | Inflammasome activation, post-transcriptional splicing, cytokine cross-talk. |
| Disease relevance | Cancer, autoimmune diseases, allergic diseases, liver injury. |
What Is GO:0032661?
GO:0032661 (regulation of interleukin-18 production) is defined as any process that modulates the frequency, rate, or extent of interleukin-18 production. This includes the regulation of IL-18 biosynthesis, processing, and secretion. It is a biological process that sits within the broader context of cytokine production and immune regulation.
Why Is regulation of interleukin-18 production Important in Cell Biology?
Regulation of interleukin-18 production is critical because IL-18 is a potent pro-inflammatory cytokine that orchestrates interferon-gamma production, natural killer cell activation, and T helper 1 responses. Dysregulation of IL-18 production is associated with a wide range of pathologies, including cancer immune escape, autoimmune disorders, allergic inflammation, and metabolic liver disease. Understanding the molecular mechanisms that control IL-18 production can reveal novel therapeutic targets and biomarkers for these conditions.
• IL-18 is a key inducer of interferon-gamma, bridging innate and adaptive immunity.
• Regulation of IL-18 production is essential for host defense against pathogens.
• Dysregulated IL-18 production contributes to cancer immune escape, as shown in gallbladder cancer.
• IL-18 is implicated in the pathogenesis of autoimmune diseases such as rheumatoid arthritis and inflammatory bowel disease.
• Allergic diseases, including asthma and atopic dermatitis, are linked to altered IL-18 production.
• Inflammasome signaling in astrocytes modulates hippocampal plasticity via IL-18 regulation.
• Tim-3 expression on macrophages regulates IL-18 production and alleviates liver injury in NASH.
• IL-18 production is regulated at the post-transcriptional level by splicing factors such as PTBP3.
• The IL-12/IL-18 axis is a major regulator of interferon-gamma production.
• Targeting IL-18 production pathways offers therapeutic potential in immuno-oncology and inflammatory diseases.
What Happens During regulation of interleukin-18 production?
Inflammasome Activation and IL-18 Processing
In simple terms: Inflammasomes are molecular platforms that activate enzymes to cut IL-18 into its active form.
IL-18 is initially synthesized as an inactive precursor (pro-IL-18) and requires cleavage by inflammasome-activated caspase-1 to become biologically active. Inflammasome signaling, particularly in astrocytes, has been shown to modulate hippocampal plasticity through IL-18 production. This step is a key regulatory node for GO:0032661, as it determines the availability of mature IL-18 for secretion.
Transcriptional and Post-transcriptional Control
In simple terms: The amount of IL-18 produced can be controlled by regulating its gene expression and RNA processing.
Transcriptional regulation of IL18 is influenced by various stimuli, including pathogen-associated molecular patterns and cytokines. Post-transcriptional mechanisms, such as alternative splicing, also play a critical role. For example, PTBP3 mediates IL-18 exon skipping to promote immune escape in gallbladder cancer, demonstrating that splicing regulation directly impacts IL-18 production. This level of control is essential for fine-tuning IL-18 levels in response to environmental cues.
Secretion and Extracellular Release
In simple terms: After processing, IL-18 is released from the cell to act on neighboring cells.
Mature IL-18 lacks a signal peptide and is secreted via unconventional pathways, which are not fully understood but are thought to involve inflammasome-dependent mechanisms. Regulation of IL-18 secretion is a component of GO:0032661, as the term includes regulation of interleukin-18 secretion. The secreted IL-18 binds to the IL-18 receptor complex to initiate signaling.
Cytokine Cross-talk and Feedback Regulation
In simple terms: IL-18 production is influenced by other cytokines and can feed back to regulate immune responses.
IL-12 and IL-18 act synergistically to induce interferon-gamma production, and this interaction is a key regulatory mechanism. Additionally, IL-18 production can be modulated by other immune regulators, such as Tim-3, which alleviates liver injury by regulating macrophage activation and IL-18 production in NASH mice. These cross-talk pathways ensure balanced immune responses and are integral to the regulation of IL-18 production.
Key Genes Involved in GO:0032661 regulation of interleukin-18 production
The following genes and proteins are key players in the regulation of interleukin-18 production, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| IL18 | Encodes the pro-inflammatory cytokine interleukin-18 | Central to GO:0032661; its production is regulated at multiple levels. |
| PTBP3 | RNA-binding protein that mediates IL-18 exon skipping | Promotes immune escape in gallbladder cancer by regulating IL-18 splicing. |
| CASP1 | Caspase-1 cleaves pro-IL-18 to mature IL-18 | Key enzyme in inflammasome-mediated IL-18 processing. |
| NLRP3 | Inflammasome sensor that activates caspase-1 | Regulates IL-18 production in response to danger signals. |
| IL12 | Cytokine that synergizes with IL-18 to induce IFN-gamma | Regulates IL-18-mediated immune responses. |
| HAVCR2 | Encodes Tim-3, an immune checkpoint inhibitor | Regulates macrophage activation and IL-18 production in NASH. |
| IL18R1 | IL-18 receptor subunit | Mediates IL-18 signaling; feedback regulation of production. |
| IL18BP | IL-18 binding protein | Neutralizes IL-18; regulates bioavailability. |
| GSDMD | Gasdermin D forms pores for IL-18 secretion | Facilitates unconventional secretion of IL-18. |
| P2RX7 | Purinergic receptor that activates NLRP3 inflammasome | Stimulates IL-18 production in immune cells. |
| MYD88 | Adaptor protein in TLR signaling | Induces pro-IL-18 expression. |
| NFKB1 | Transcription factor for IL18 gene expression | Regulates transcriptional activation of IL18. |
| STAT1 | Transcription factor in IFN-gamma signaling | May feedback regulate IL-18 production. |
| IFNG | Interferon-gamma, induced by IL-18 | Part of the IL-12/IL-18 axis. |
| AHR | Aryl hydrocarbon receptor | Modulates IL-18 production in barrier tissues. |
| TGFB1 | Transforming growth factor beta | Regulates IL-18 production in fibrosis and cancer. |
How Is regulation of interleukin-18 production Regulated?
The regulation of interleukin-18 production is a multi-layered process. At the transcriptional level, NF-kB and other transcription factors drive IL18 gene expression in response to TLR signaling. Post-transcriptionally, splicing factors such as PTBP3 can modulate IL-18 isoform expression, as seen in gallbladder cancer. Inflammasome activation, particularly NLRP3, is a critical step for caspase-1-mediated cleavage of pro-IL-18. Cytokine cross-talk, such as the synergistic action of IL-12 and IL-18, further fine-tunes the immune response. Additionally, checkpoint molecules like Tim-3 can suppress IL-18 production in macrophages, thereby limiting inflammation.
regulation of interleukin-18 production and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PTBP3 | Gallbladder cancer immune escape | PTBP3 knockout or overexpression in gallbladder cancer cell lines |
| HAVCR2 | NASH liver injury | Tim-3 knockout mice or overexpression in macrophages |
| IL18 | Autoimmune diseases | IL-18 knockout mice or human cell lines |
| NLRP3 | Inflammasome-related diseases | NLRP3 knockout macrophages |
| IL12 | Inflammatory diseases | IL-12 knockout mice |
Cancer Immune Escape
In gallbladder cancer, PTBP3 mediates IL-18 exon skipping, leading to reduced production of functional IL-18 and promoting immune escape. This highlights how dysregulation of IL-18 production can facilitate tumor progression. Targeting the splicing machinery or restoring IL-18 production could enhance anti-tumor immunity.
Autoimmune and Inflammatory Diseases
IL-18 is a key mediator of autoimmune diseases such as rheumatoid arthritis and inflammatory bowel disease. Elevated IL-18 production contributes to chronic inflammation and tissue damage. Understanding the regulation of IL-18 production is therefore crucial for developing therapies that dampen pathological inflammation without compromising host defense.
Allergic Diseases
IL-18 plays a role in the pathophysiology of allergic diseases, including asthma and atopic dermatitis. Regulation of IL-18 production in epithelial cells and immune cells influences the severity of allergic inflammation. Modulating IL-18 production may offer therapeutic benefits in these conditions.
Liver Injury and NASH
In non-alcoholic steatohepatitis (NASH), increased Tim-3 expression alleviates liver injury by regulating macrophage activation and IL-18 production. This suggests that IL-18 production is a pathogenic factor in NASH and that targeting its regulation could be beneficial.
From regulation of interleukin-18 production-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does PTBP3 regulate IL-18 production? | PTBP3 knockout or overexpression in cancer cell lines |
| How does Tim-3 affect IL-18 production in NASH? | Tim-3 knockout mice or macrophage-specific overexpression |
| What is the role of inflammasome in IL-18 production? | NLRP3 knockout mice or caspase-1 knockout |
| How does IL-12 synergize with IL-18? | IL-12 knockout mice or double knockout |
| Does IL-18 production affect allergic inflammation? | IL-18 knockout mice in allergy models |
| Can CRISPR activation increase IL-18 production? | dCas9-VP64 activation in cell lines |
How to Study the regulation of interleukin-18 production Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screening | Loss-of-function of genes | Identify negative regulators of IL-18 production |
| CRISPR activation screening | Gain-of-function of genes | Identify positive regulators of IL-18 production |
| RNA-seq | mRNA levels and splicing | Detect alternative splicing of IL18 |
| ELISA | Secreted IL-18 protein | Quantify IL-18 production in supernatants |
| Western blot | Pro- and mature IL-18 protein | Assess processing and expression |
| Flow cytometry | Intracellular IL-18 | Measure IL-18 in immune cell subsets |
| Inflammasome activation assay | Caspase-1 activity | Study inflammasome-dependent IL-18 production |
| Co-immunoprecipitation | Protein-protein interactions | Identify regulators of IL-18 processing |
CRISPR Screening for Regulators of IL-18 Production
Genome-wide CRISPR knockout or activation screens can identify genes that regulate IL-18 production. Cells are engineered to report IL-18 levels, and sgRNA libraries are introduced to select for regulators. This approach can uncover novel players in GO:0032661.
RNA Sequencing and Splicing Analysis
RNA-seq can quantify IL18 mRNA levels and detect alternative splicing events, such as exon skipping mediated by PTBP3. This method is useful for understanding post-transcriptional regulation of IL-18 production.
Protein Detection and Quantification
ELISA, Western blot, and flow cytometry can measure pro-IL-18 and mature IL-18 levels in cell lysates and supernatants. These methods are essential for validating regulatory mechanisms.
Inflammasome Activation Assays
Inflammasome activation can be assessed by measuring caspase-1 cleavage and IL-18 secretion in response to stimuli such as LPS and ATP. This helps dissect the role of inflammasome components in IL-18 production.
How CRISPR Can Be Used to Study GO:0032661 regulation of interleukin-18 production
Knockout
CRISPR knockout of candidate genes (e.g., PTBP3, NLRP3) can determine their necessity for IL-18 production. For example, PTBP3 knockout may restore IL-18 production in cancer cells. Knockout models are valuable for validating loss-of-function phenotypes in GO:0032661.
Point Mutation
Point mutations can be introduced to study specific residues or splice sites. For instance, mutating the PTBP3 binding site in IL18 pre-mRNA can reveal its role in exon skipping. This approach provides mechanistic insights into regulatory elements.
Knock-in
Knock-in of reporter genes (e.g., GFP) or tags into the IL18 locus allows real-time monitoring of IL-18 production. Tagged knock-in can also facilitate protein purification and interaction studies.
Overexpression
Overexpression of candidate regulators (e.g., Tim-3) can suppress IL-18 production, as shown in NASH models. Conversely, overexpression of IL-18 itself can drive inflammation. These models help establish sufficiency in GO:0032661.
How EDITGENE Supports regulation of interleukin-18 production Research
Researchers studying regulation of interleukin-18 production-related genes often need to determine whether a candidate gene is causally involved in modulating IL-18 levels. This requires precise genetic manipulation, which can be achieved through CRISPR-based knockout, point mutation, knock-in, or overexpression models. EDITGENE provides comprehensive services to support such investigations, from cell line generation to library screening and bioinformatics analysis.
Contact EDITGENE today to design your custom CRISPR model for regulation of interleukin-18 production research.
Frequently Asked Questions About regulation of interleukin-18 production
What is GO:0032661?
GO:0032661 is a Gene Ontology term for regulation of interleukin-18 production, defined as any process that modulates the frequency, rate, or extent of interleukin-18 production.
What genes are involved in regulation of interleukin-18 production?
Key genes include IL18, PTBP3, CASP1, NLRP3, IL12, and HAVCR2, among others.
How is interleukin-18 production regulated?
IL-18 production is regulated at transcriptional, post-transcriptional (e.g., splicing), and post-translational (inflammasome cleavage) levels.
What diseases are associated with dysregulated IL-18 production?
Dysregulated IL-18 production is linked to cancer, autoimmune diseases, allergic diseases, and NASH.
What is the role of PTBP3 in IL-18 production?
PTBP3 mediates IL-18 exon skipping, reducing functional IL-18 production and promoting immune escape in gallbladder cancer.
How does Tim-3 regulate IL-18 production?
Tim-3 expression on macrophages regulates IL-18 production and alleviates liver injury in NASH mice.
What is the IL-12/IL-18 axis?
IL-12 and IL-18 synergize to induce interferon-gamma production, a key immune regulatory pathway.
Can CRISPR be used to study IL-18 production?
Yes, CRISPR knockout, activation, and knock-in models are powerful tools to dissect regulators of IL-18 production.
What are the research methods for studying IL-18 production?
Common methods include CRISPR screening, RNA-seq, ELISA, Western blot, and inflammasome activation assays.
Why is regulation of IL-18 production important?
It is crucial for understanding immune responses and developing therapies for inflammatory diseases and cancer.
Conclusion
GO:0032661 (regulation of interleukin-18 production) is a fundamental biological process that controls the availability of the pleiotropic cytokine IL-18. Its dysregulation contributes to cancer, autoimmunity, allergy, and liver disease. Advances in CRISPR-based models and high-throughput screening are accelerating the discovery of novel regulators and therapeutic targets. EDITGENE offers a comprehensive suite of services to support research in this area, from custom cell line generation to bioinformatics analysis.
References
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- 2. Zengeler KE et al.. 2025. Inflammasome signaling in astrocytes modulates hippocampal plasticity.. Immunity 58(6):1519-1535.e11 PMID: 40318630
- 3. Du X et al.. 2019. Increased Tim-3 expression alleviates liver injury by regulating macrophage activation in MCD-induced NASH mice.. Cell Mol Immunol 16(11):878-886 PMID: 29735977
- 4. Okamura H et al.. 1998. Regulation of interferon-gamma production by IL-12 and IL-18.. Curr Opin Immunol 10(3):259-64 PMID: 9638361
- 5. Gracie JA et al.. 2003. Interleukin-18.. J Leukoc Biol 73(2):213-24 PMID: 12554798
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- 7. Sanders NL et al.. 2016. Role of interleukin-18 in the pathophysiology of allergic diseases.. Cytokine Growth Factor Rev 32:31-39 PMID: 27496752
- 8. Yasuda K et al.. 2019. Interleukin-18 in Health and Disease.. Int J Mol Sci 20(3) PMID: 30717382
