GO:1902565 positive regulation of neutrophil activation: Immune Amplification Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902565 (positive regulation of neutrophil activation) is a biological process term defined as any process that activates or increases the frequency, rate or extent of neutrophil activation [QuickGO].
• Neutrophil activation is a double-edged sword: it is essential for pathogen clearance but, when excessive or dysregulated, drives tissue damage in inflammatory and autoimmune diseases [3, 8].
• The microbiome and ageing regulate neutrophil activation status, linking host-microbe interactions to neutrophil functional heterogeneity.
• Tumor-associated neutrophil infiltration and NETosis are clinically relevant outcomes of positive regulation of neutrophil activation in cancer and endometriosis [2, 4].
• Key signaling nodes controlling this process include PKB/Akt, leptin/obR, IL-18R1-NF-kB, and CRKL, each representing a potential therapeutic or research target [4, 5, 6, 8].
• CRISPR-based knockout, point-mutation, knock-in and overexpression models are powerful tools to dissect causal roles of candidate genes in positive regulation of neutrophil activation [4, 5, 7].
Description
GO:1902565, positive regulation of neutrophil activation, is a Gene Ontology biological process term that describes any process that activates or increases the frequency, rate or extent of neutrophil activation [QuickGO]. Neutrophils are the most abundant circulating leukocytes and act as first responders to infection and injury. Their activation encompasses a spectrum of responses including degranulation, oxidative burst, cytokine release, and formation of neutrophil extracellular traps (NETs). Because unrestrained neutrophil activation can damage host tissues, this process is tightly controlled by positive and negative regulatory inputs [3, 6]. Understanding the molecular players that positively regulate neutrophil activation is therefore central to immunology, inflammation research, and drug discovery. Recent single-cell and functional studies have begun to map the immune microenvironment and the signaling circuits that drive neutrophil activation in diverse contexts. For example, a single-cell atlas of orthodontic tooth movement has characterized immune cell dynamics including neutrophils in a mechanically induced inflammatory model. In endometriosis, intraperitoneal translocation of gut microbiota has been shown to induce NETosis, a hallmark of neutrophil activation, linking microbial signals to disease pathology. Neutrophil ageing itself is regulated by the microbiome, indicating that positive regulation of neutrophil activation is influenced by host-microbiota crosstalk. These findings underscore that GO:1902565 is not a single linear pathway but an integrated outcome of multiple regulatory inputs. For researchers, GO:1902565 provides a standardized framework to annotate and compare experiments that measure neutrophil activation. Whether studying cancer immunotherapy resistance, obesity-related airway inflammation, or endometriosis, the term helps connect molecular mechanisms to a defined biological process. This article reviews the definition, core mechanisms, key genes, disease relevance, and state-of-the-art research methods including CRISPR-based models for interrogating positive regulation of neutrophil activation [4, 5, 6, 7, 8].
positive regulation of neutrophil activation At A Glance
| GO ID | GO:1902565 |
|---|---|
| GO term | positive regulation of neutrophil activation |
| Ontology | biological_process |
| Definition | Any process that activates or increases the frequency, rate or extent of neutrophil activation. |
| Synonym | activation of neutrophil activation; up regulation of neutrophil activation; up-regulation of neutrophil activation; upregulation of neutrophil activation |
| Major function | Positive regulation of neutrophil activation, including promotion of degranulation, oxidative burst, cytokine release, and NET formation. |
| Related process | Neutrophil activation (GO:0042119) and its regulation. |
| Cellular context | Neutrophils and their interacting immune and stromal cells in inflammatory microenvironments. |
| Disease relevance | Inflammation, autoimmunity, cancer, endometriosis, obesity-related airway inflammation. |
What Is GO:1902565?
In our own words, GO:1902565 (positive regulation of neutrophil activation) refers to any biological process that activates or increases the frequency, rate, or extent of neutrophil activation. It is a regulatory biological process term in the Gene Ontology, meaning it describes an upstream or parallel process that positively modulates the activation state of neutrophils. Neutrophil activation itself includes processes such as degranulation, respiratory burst, cytokine production, and NET formation. The term is therefore used to annotate gene products and pathways that promote, rather than suppress, neutrophil activation [QuickGO].
Why Is positive regulation of neutrophil activation Important in Cell Biology?
Positive regulation of neutrophil activation is critically important because neutrophils are central effectors of innate immunity, and their over-activation contributes to tissue damage in inflammatory and autoimmune diseases, while insufficient activation impairs pathogen clearance. The process is dynamically regulated by host and environmental factors, including the microbiome and ageing. In cancer, tumor-associated neutrophil infiltration and NETosis can promote immune evasion and resistance to immunotherapy [2, 4]. In metabolic and allergic inflammation, leptin/obR signaling exacerbates neutrophilic airway inflammation through inflammatory macrophages. Thus, understanding GO:1902565 informs both fundamental immunology and therapeutic strategies targeting neutrophil-driven pathology.
• Defines a standardized biological process for annotating genes that promote neutrophil activation [QuickGO].
• Links microbiome and ageing to neutrophil functional states, with implications for host defense and chronic inflammation.
• Underlies NETosis, a key mechanism in endometriosis pathogenesis following gut microbiota translocation.
• Contributes to tumor immune evasion and anti-PD-1 resistance via tumor-associated neutrophil infiltration.
• Involves IL-18R1-NF-kB signaling that promotes IL-18-mediated tumor immune evasion.
• Is modulated by PKB/Akt signaling, which regulates neutrophil apoptosis and survival.
• Is influenced by leptin/obR signaling in obesity-related neutrophilic airway inflammation.
• Provides a framework for CRISPR screens to identify positive regulators of neutrophil activation [4, 5, 7].
• Relevant to chemoimmunotherapy resistance mechanisms involving chemokine regulation.
• Supports development of targeted therapies to modulate neutrophil activity in disease [2, 4, 8].
What Happens During positive regulation of neutrophil activation?
Initiation by inflammatory and microbial cues
In simple terms: The process often starts when microbes or inflammatory signals wake up neutrophils.
Positive regulation of neutrophil activation can be initiated by microbial products and inflammatory cytokines. Intraperitoneal translocation of gut microbiota induces NETosis, demonstrating that microbial signals can drive neutrophil activation in vivo. The microbiome also regulates neutrophil ageing, indicating that commensal or pathogenic microbes shape neutrophil activation status. In orthodontic tooth movement, a single-cell atlas revealed dynamic immune microenvironment changes including neutrophil involvement, suggesting mechanical inflammation can trigger neutrophil activation.
Signal transduction through kinase and cytokine pathways
In simple terms: Inside the cell, specific signaling pathways amplify the activation signal.
Multiple signaling pathways positively regulate neutrophil activation. PKB/Akt modulation regulates neutrophil apoptosis, thereby influencing the lifespan and functional state of activated neutrophils. Leptin/obR signaling exacerbates obesity-related neutrophilic airway inflammation through inflammatory M1 macrophages, providing an indirect but potent positive regulatory axis. IL-18R1-NF-kB signaling promotes IL-18-mediated tumor immune evasion, linking cytokine-driven NF-kB activation to neutrophil-associated immune suppression.
Amplification via tumor-associated neutrophil infiltration
In simple terms: In tumors, signals can recruit and activate neutrophils, helping the tumor escape immunity.
CRKL dictates anti-PD-1 resistance by mediating tumor-associated neutrophil infiltration in hepatocellular carcinoma, showing that specific adaptor proteins can positively regulate neutrophil recruitment and activation in the tumor microenvironment. This infiltration is associated with resistance to immune checkpoint blockade, highlighting the clinical importance of this regulatory process. Chemokine regulation, such as CXCL16 downregulation by ZEB1, can also shape the immune microenvironment and chemoimmunotherapy resistance, indirectly affecting neutrophil activation.
Effector outputs: NETosis, degranulation, and oxidative burst
In simple terms: Once activated, neutrophils release traps, granules, and reactive molecules to fight or damage.
The ultimate outputs of positive regulation of neutrophil activation include NETosis, degranulation, and oxidative burst. NETosis is a key effector mechanism in endometriosis, where gut microbiota translocation induces NET formation. These effector functions are essential for pathogen clearance but can cause tissue damage when excessive. The balance between activation and apoptosis, regulated by PKB/Akt, determines the duration and intensity of these outputs.
Resolution and feedback control
In simple terms: The process must be turned off or resolved to prevent chronic damage.
Negative feedback and resolution mechanisms are critical to prevent persistent neutrophil activation. Although GO:1902565 specifically describes positive regulation, understanding the counter-regulatory processes is essential. Microbiome-dependent regulation of neutrophil ageing suggests that host-microbe interactions can set the threshold for activation and resolution. Dysregulation of these feedback loops contributes to chronic inflammatory diseases such as obesity-related airway inflammation and endometriosis.
Key Genes Involved in GO:1902565 positive regulation of neutrophil activation
The following genes and proteins have been experimentally linked to positive regulation of neutrophil activation or its downstream effector processes in the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CRKL | Mediates tumor-associated neutrophil infiltration and anti-PD-1 resistance | Target for overcoming immunotherapy resistance in hepatocellular carcinoma |
| ACSL6 | Activates IL-18R1-NF-kB signaling | Promotes IL-18-mediated tumor immune evasion and progression |
| PKB/Akt (AKT1) | Regulates neutrophil apoptosis and survival | Modulates neutrophil lifespan and activation duration |
| LEP (Leptin) | Leptin/obR signaling exacerbates neutrophilic airway inflammation | Links obesity to airway inflammation via M1 macrophages |
| LEPR (obR) | Receptor for leptin, mediates signaling in inflammatory macrophages | Potential target in obesity-related neutrophilic inflammation |
| CXCL16 | Chemokine downregulated by ZEB1 | Affects chemoimmunotherapy resistance and immune microenvironment |
| ZEB1 | Downregulates chromatin acetylation of CXCL16 | Promotes chemoimmunotherapy resistance in pancreatic cancer |
| IL18R1 | Receptor for IL-18, activates NF-kB | Mediates tumor immune evasion |
| NFKB1 | Transcription factor downstream of IL-18R1 | Central to inflammatory gene expression in neutrophils |
| Microbiome-derived signals | Regulate neutrophil ageing and activation | Host-microbe interactions shaping neutrophil function |
| Gut microbiota | Induce NETosis upon intraperitoneal translocation | Drives endometriosis pathogenesis |
| Immune cells in orthodontic tooth movement | Include neutrophils in mechanically induced inflammation | Single-cell atlas reveals dynamic immune microenvironment |
| M1 macrophages | Mediate leptin/obR-driven neutrophilic airway inflammation | Inflammatory cell crosstalk in obesity |
| NET components (e.g., DNA, histones) | Effector molecules of NETosis | Biomarkers and therapeutic targets in endometriosis |
| PD-1/PD-L1 axis | Checkpoint pathway affected by neutrophil infiltration | Anti-PD-1 resistance mechanism |
| IL-18 | Cytokine promoting tumor immune evasion | Therapeutic target in IL-18R1-NF-kB axis |
How Is positive regulation of neutrophil activation Regulated?
Positive regulation of neutrophil activation is controlled by multiple intersecting signaling pathways. PKB/Akt signaling modulates neutrophil apoptosis, thereby regulating the lifespan of activated neutrophils and the duration of the activation response. Leptin/obR signaling in inflammatory M1 macrophages exacerbates obesity-related neutrophilic airway inflammation, providing a metabolic-immune regulatory axis. The IL-18R1-NF-kB pathway promotes IL-18-mediated tumor immune evasion, linking cytokine signaling to transcriptional programs that sustain neutrophil-associated immune suppression. CRKL mediates tumor-associated neutrophil infiltration, acting as an adaptor protein that positively regulates neutrophil recruitment in hepatocellular carcinoma. Additionally, the microbiome regulates neutrophil ageing, suggesting that microbial signals set the threshold for activation. These regulatory layers collectively determine the intensity and duration of positive regulation of neutrophil activation.
positive regulation of neutrophil activation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CRKL | Hepatocellular carcinoma, anti-PD-1 resistance | CRKL knockout or overexpression in HCC cell lines and mouse models |
| ACSL6 | Tumor immune evasion, cancer progression | ACSL6 knockout or point mutation in tumor cells |
| LEP/LEPR | Obesity-related neutrophilic airway inflammation | Leptin/obR knockout or overexpression in mouse models |
| ZEB1 | Pancreatic cancer chemoimmunotherapy resistance | ZEB1 knockout or knock-in in pancreatic cancer models |
| Gut microbiota | Endometriosis, NETosis | Microbiota translocation models and NETosis assays |
Cancer and immunotherapy resistance
Positive regulation of neutrophil activation contributes to tumor immune evasion and resistance to immune checkpoint blockade. CRKL mediates tumor-associated neutrophil infiltration and dictates anti-PD-1 resistance in hepatocellular carcinoma. IL-18R1-NF-kB signaling promotes IL-18-mediated tumor immune evasion and tumor progression, linking cytokine-driven neutrophil activation to poor outcomes. ZEB1 promotes chemoimmunotherapy resistance in pancreatic cancer by downregulating chromatin acetylation of CXCL16, which alters the immune microenvironment. These findings position positive regulation of neutrophil activation as a therapeutic target in oncology.
Endometriosis and NETosis
Intraperitoneal translocation of gut microbiota induces NETosis and promotes endometriosis, directly implicating positive regulation of neutrophil activation in the pathogenesis of this gynecological disease. NETs are effector structures released by activated neutrophils, and their excessive formation contributes to inflammation and tissue remodeling in endometriosis. This highlights the gut-microbiota-neutrophil axis as a potential therapeutic target.
Obesity-related airway inflammation
Leptin/obR signaling exacerbates obesity-related neutrophilic airway inflammation through inflammatory M1 macrophages, demonstrating that metabolic signals can positively regulate neutrophil activation in the lung. This links obesity to asthma-like airway pathology and suggests that targeting leptin signaling may reduce neutrophilic inflammation.
Ageing and microbiome interactions
Neutrophil ageing is regulated by the microbiome, indicating that positive regulation of neutrophil activation is influenced by host-microbe interactions over time. Dysregulated neutrophil ageing may contribute to chronic inflammatory diseases and impaired immune responses in the elderly.
From positive regulation of neutrophil activation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does CRKL causally drive tumor-associated neutrophil infiltration? | CRKL knockout in hepatocellular carcinoma cell lines and mouse models |
| Does ACSL6 activate IL-18R1-NF-kB signaling to promote immune evasion? | ACSL6 knockout or point-mutation models in tumor cells |
| Does leptin/obR signaling directly regulate neutrophil activation? | LEPR knockout or overexpression in macrophages and neutrophil co-culture |
| Does ZEB1 downregulation of CXCL16 affect neutrophil recruitment? | ZEB1 knockout or knock-in in pancreatic cancer models |
| How does the microbiome regulate neutrophil ageing? | Germ-free or antibiotic-treated mouse models with neutrophil functional assays |
| What is the single-cell landscape of neutrophils in inflammatory tissue? | Single-cell RNA-seq in orthodontic tooth movement or endometriosis models [1, 2] |
How to Study the positive regulation of neutrophil activation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Single-cell RNA-seq | Immune cell heterogeneity and neutrophil states | Mapping inflammatory microenvironments |
| NETosis assay | Neutrophil extracellular trap formation | Endometriosis and microbial translocation studies |
| Flow cytometry | Neutrophil activation markers and infiltration | Tumor and inflammation models |
| CRISPR knockout | Loss-of-function effects on neutrophil activation | Causal gene validation [4, 5] |
| CRISPR point mutation | Specific amino acid function in signaling | Dissecting IL-18R1-NF-kB pathway |
| CRISPR knock-in | Tagged or reporter gene expression | Tracking neutrophil activation in vivo |
| Overexpression | Gain-of-function effects | Testing leptin/obR signaling |
| Microbiome manipulation | Host-microbe interactions | Neutrophil ageing studies |
Single-cell transcriptomics
Single-cell RNA sequencing enables mapping of immune cell heterogeneity, including neutrophil states, in inflammatory microenvironments. A single-cell atlas of orthodontic tooth movement revealed dynamic immune microenvironment changes including neutrophils, providing a template for studying positive regulation of neutrophil activation in situ. This method can identify novel regulators and activation trajectories.
Functional neutrophil assays
NETosis assays, oxidative burst measurements, and degranulation assays directly quantify neutrophil activation outputs. Intraperitoneal translocation of gut microbiota induces NETosis, which can be measured by NET-specific markers. These functional assays are essential to validate positive regulation of neutrophil activation in vitro and in vivo.
CRISPR screening and gene editing
CRISPR knockout, point-mutation, knock-in, and overexpression models allow causal interrogation of candidate genes. For example, CRKL knockout can test its role in tumor-associated neutrophil infiltration, while ACSL6 knockout or point mutation can dissect IL-18R1-NF-kB signaling. These approaches are central to moving from correlation to causation in GO:1902565 research.
Flow cytometry and imaging
Flow cytometry can quantify neutrophil activation markers, while imaging can visualize NET formation and tissue infiltration. These methods are used to assess neutrophil infiltration in tumors and NETosis in endometriosis. They provide spatial and quantitative readouts of positive regulation of neutrophil activation.
How CRISPR Can Be Used to Study GO:1902565 positive regulation of neutrophil activation
Knockout
CRISPR knockout is used to delete candidate genes and assess their requirement for positive regulation of neutrophil activation. For example, CRKL knockout can test whether it is necessary for tumor-associated neutrophil infiltration and anti-PD-1 resistance. ACSL6 knockout can determine its role in IL-18R1-NF-kB-mediated immune evasion. These models provide loss-of-function evidence for causal involvement.
Point Mutation
CRISPR point mutation introduces specific amino acid changes to dissect domain functions. This is particularly useful for signaling proteins such as ACSL6 or IL-18R1, where specific residues may be required for NF-kB activation. Point-mutation models help distinguish catalytic versus scaffolding functions in positive regulation of neutrophil activation.
Knock-in
CRISPR knock-in can insert tags, reporters, or human disease alleles to track gene expression and function. For example, knocking in a reporter into the CXCL16 locus could monitor its regulation by ZEB1 in pancreatic cancer models. Knock-in models are valuable for studying dynamic regulation of neutrophil activation in vivo.
Overexpression
CRISPR overexpression (e.g., via CRISPRa) or transgenic overexpression can test gain-of-function effects. Overexpressing leptin or obR can exacerbate neutrophilic airway inflammation, as shown in obesity models. Overexpression models complement knockout studies to establish sufficiency in positive regulation of neutrophil activation.
How EDITGENE Supports positive regulation of neutrophil activation Research
Researchers studying positive regulation of neutrophil activation-related genes often need to determine whether a candidate gene is causally involved in driving neutrophil activation, or whether it is merely a bystander in an inflammatory network. CRISPR-based gene editing provides the gold-standard approach to establish causality through knockout, point mutation, knock-in, and overexpression models. EDITGENE offers end-to-end services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of neutrophil activation research.
Frequently Asked Questions About positive regulation of neutrophil activation
What is GO:1902565?
GO:1902565 is the Gene Ontology term for positive regulation of neutrophil activation, defined as any process that activates or increases the frequency, rate or extent of neutrophil activation [QuickGO].
What genes are involved in positive regulation of neutrophil activation?
Genes experimentally linked to this process include CRKL, ACSL6, PKB/Akt, leptin/obR, ZEB1, CXCL16, and IL-18R1, among others [4, 5, 6, 7, 8].
How is neutrophil activation regulated by the microbiome?
The microbiome regulates neutrophil ageing, indicating that host-microbe interactions shape neutrophil activation status over time.
What is the role of NETosis in disease?
NETosis, a form of neutrophil activation, is induced by intraperitoneal translocation of gut microbiota and promotes endometriosis.
How does CRKL affect anti-PD-1 resistance?
CRKL mediates tumor-associated neutrophil infiltration and dictates anti-PD-1 resistance in hepatocellular carcinoma.
What signaling pathways positively regulate neutrophil activation?
Key pathways include PKB/Akt, leptin/obR, IL-18R1-NF-kB, and CRKL-mediated signaling [4, 5, 6, 8].
Can CRISPR be used to study neutrophil activation?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect causal genes in positive regulation of neutrophil activation [4, 5, 7].
What diseases are associated with positive regulation of neutrophil activation?
Associated diseases include cancer, endometriosis, obesity-related airway inflammation, and ageing-related inflammatory conditions [2, 3, 4, 8].
How does leptin signaling affect neutrophil activation?
Leptin/obR signaling exacerbates obesity-related neutrophilic airway inflammation through inflammatory M1 macrophages.
What methods are used to study positive regulation of neutrophil activation?
Methods include single-cell RNA-seq, NETosis assays, flow cytometry, CRISPR screens, and microbiome manipulation [1, 2, 3, 4].
Conclusion
GO:1902565 (positive regulation of neutrophil activation) is a critical biological process that integrates microbial, metabolic, and cytokine signals to control neutrophil effector functions. Its dysregulation contributes to cancer immunotherapy resistance, endometriosis, obesity-related airway inflammation, and ageing-related inflammation [2, 3, 4, 8]. Understanding the molecular players such as CRKL, ACSL6, PKB/Akt, and leptin/obR provides opportunities for therapeutic intervention [4, 5, 6, 8]. CRISPR-based models are indispensable for establishing causality in this complex process. By combining knockout, point-mutation, knock-in, and overexpression approaches with single-cell and functional assays, researchers can dissect the regulatory networks of positive regulation of neutrophil activation. EDITGENE provides comprehensive services to support these efforts from target discovery to validation.
References
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- 2. Wu X et al.. 2026. Intraperitoneal translocation of gut microbiota induces NETosis and promotes endometriosis.. Gut 75(6):1110-1122 PMID: 41320323
- 3. Zhang D et al.. 2015. Neutrophil ageing is regulated by the microbiome.. Nature 525(7570):528-32 PMID: 26374999
- 4. Xie P et al.. 2024. CRKL dictates anti-PD-1 resistance by mediating tumor-associated neutrophil infiltration in hepatocellular carcinoma.. J Hepatol 81(1):93-107 PMID: 38403027
- 5. Di Y et al.. 2024. ACSL6-activated IL-18R1-NF-κB promotes IL-18-mediated tumor immune evasion and tumor progression.. Sci Adv 10(38):eadp0719 PMID: 39292786
- 6. Rane MJ et al.. 2009. Regulation of neutrophil apoptosis by modulation of PKB/Akt activation.. Front Biosci (Landmark Ed) 14(7):2400-12 PMID: 19273208
- 7. Zhang S et al.. 2025. ZEB1 promotes chemoimmunotherapy resistance in pancreatic cancer models by downregulating chromatin acetylation of CXCL16.. J Clin Invest 135(22) PMID: 40924501
- 8. Wang Y et al.. 2023. Leptin/obR signaling exacerbates obesity-related neutrophilic airway inflammation through inflammatory M1 macrophages.. Mol Med 29(1):100 PMID: 37488474
