GO:0035713 response to nitrogen dioxide: Inflammatory Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0035713 (response to nitrogen dioxide) is a biological_process defined as any process that changes a cell or organism's state or activity in response to a nitrogen dioxide (NO2) stimulus.
• NO2 exposure triggers airway inflammation, with increased neutrophils, cytokines and airway hyper-responsiveness in humans and animal models.
• Sex modifies the inflammatory response to NO2, with differential effects on oxidative stress and immune cell recruitment.
• Long-term NO2 exposure is associated with increased cardiovascular mortality in large cohort studies.
• In plants, NO2 suppresses hypocotyl elongation by inhibiting phytochrome interacting factor 4 (PIF4) activity.
• Research tools include controlled human exposure, animal models, transcriptomics, and CRISPR knockout/knock-in cell models to dissect NO2-responsive pathways.
Description
GO:0035713, response to nitrogen dioxide, is a Gene Ontology biological process term that describes any process resulting in a change in state or activity of a cell or organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a nitrogen dioxide (NO2) stimulus. NO2 is a common air pollutant generated by combustion, and its effects on biological systems range from plant growth regulation to human respiratory and cardiovascular pathology. Understanding this response is critical for environmental health, toxicology, and plant biology, as it links air quality to molecular and physiological outcomes. Researchers study GO:0035713 to identify biomarkers of exposure, elucidate inflammatory mechanisms, and develop interventions for pollution-related diseases.
response to nitrogen dioxide At A Glance
| GO ID | GO:0035713 |
|---|---|
| GO term | response to nitrogen dioxide |
| Ontology | biological_process |
| Synonym | response to NO2 |
| Definition | Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a nitrogen dioxide (NO2) stimulus. |
| Major function | Mediating cellular and systemic responses to NO2 exposure, including inflammation, oxidative stress, and gene expression changes. |
| Taxonomic range | Across plants and animals, including human, mouse, and Arabidopsis. |
| Related processes | Response to oxidative stress, inflammatory response, airway hyper-responsiveness. |
What Is GO:0035713?
In our own words, GO:0035713 encompasses all cellular and organismal responses triggered by exposure to nitrogen dioxide (NO2). This includes changes in gene expression, secretion of inflammatory mediators, cell movement, and enzyme production that occur as a direct or indirect consequence of NO2 stimulation. The term is used to annotate gene products involved in sensing, transducing, and responding to NO2, from plants to humans.
Why Is response to nitrogen dioxide Important in Cell Biology?
GO:0035713 is important because nitrogen dioxide is a ubiquitous air pollutant with significant impacts on human health and plant physiology. In humans, NO2 exposure exacerbates asthma, increases airway inflammation, and is linked to cardiovascular mortality. In plants, NO2 affects growth and development by modulating transcription factor activity. Understanding the molecular players in this response can inform public health policies, therapeutic strategies, and crop improvement.
• NO2 exposure increases inflammatory mediators and airway hyper-responsiveness in allergic airways disease.
• Controlled human exposure studies show neutrophil influx and cytokine release after NO2 inhalation.
• Sex-specific differences in response to NO2 highlight the need for personalized risk assessment.
• Long-term NO2 exposure is associated with cardiovascular mortality in nationwide cohorts.
• In plants, NO2 suppresses hypocotyl elongation via PIF4 inhibition, linking air quality to growth.
• Asthma patients may experience airway hyper-responsiveness after NO2 exposure, though evidence is debated.
• NO2 is a model stimulus for studying environmental effects on gene expression and cell signaling.
• Research on GO:0035713 can identify therapeutic targets for pollution-related diseases.
What Happens During response to nitrogen dioxide?
Sensing and Immediate Cellular Responses
In simple terms: Cells detect NO2 and quickly activate defense mechanisms.
Upon NO2 exposure, cells initiate signaling cascades that lead to changes in gene expression and secretion. In human airways, NO2 triggers the release of inflammatory mediators such as cytokines and chemokines, recruiting immune cells like neutrophils. In plants, NO2 is sensed and leads to suppression of PIF4 activity, affecting growth.
Inflammatory Mediator Release
In simple terms: NO2 causes the release of molecules that drive inflammation.
NO2 exposure results in increased production of inflammatory mediators, including interleukins and tumor necrosis factor, which contribute to airway inflammation and hyper-responsiveness. Controlled human exposure studies show elevated neutrophils and inflammatory markers in bronchoalveolar lavage fluid after NO2 inhalation.
Oxidative Stress and Cellular Damage
In simple terms: NO2 can cause oxidative stress, damaging cells.
NO2 induces oxidative stress by generating reactive oxygen species, leading to lipid peroxidation and cellular damage. This oxidative burst is a key component of the response to NO2 and contributes to the pathogenesis of respiratory and cardiovascular diseases.
Systemic Effects and Disease Associations
In simple terms: NO2 effects extend beyond the lungs, affecting the whole body.
Long-term exposure to NO2 is associated with increased cardiovascular mortality, as shown in a nationwide cohort study. Sex modifies the response, with differential effects on oxidative stress and immune cell recruitment. These systemic effects highlight the importance of understanding GO:0035713 in public health.
Key Genes Involved in GO:0035713 response to nitrogen dioxide
The following genes and proteins have been implicated in the response to nitrogen dioxide across various organisms.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PIF4 | Phytochrome interacting factor 4; suppresses hypocotyl elongation in response to NO2 | Plant growth regulation under air pollution |
| IL6 | Interleukin 6; pro-inflammatory cytokine | Mediator of NO2-induced airway inflammation |
| TNF | Tumor necrosis factor; pro-inflammatory cytokine | Key mediator of NO2-induced inflammation |
| CXCL8 | Interleukin 8; neutrophil chemoattractant | Recruits neutrophils to airways after NO2 exposure |
| NFKB1 | Nuclear factor kappa B subunit 1; transcription factor | Regulates inflammatory gene expression in response to NO2 |
| HMOX1 | Heme oxygenase 1; antioxidant enzyme | Protects against NO2-induced oxidative stress |
| NOS2 | Nitric oxide synthase 2; produces nitric oxide | Contributes to NO2-induced nitrosative stress |
| TP53 | Tumor protein p53; tumor suppressor | May respond to NO2-induced DNA damage |
| CYP1A1 | Cytochrome P450 family 1 subfamily A member 1 | Metabolizes pollutants; may be induced by NO2 |
| GCLC | Glutamate-cysteine ligase catalytic subunit | Glutathione synthesis; antioxidant defense |
| SOD2 | Superoxide dismutase 2; mitochondrial antioxidant | Protects against NO2-induced oxidative stress |
| CAT | Catalase; antioxidant enzyme | Detoxifies hydrogen peroxide |
| MPO | Myeloperoxidase; neutrophil enzyme | Marker of neutrophil activation in NO2 response |
| ICAM1 | Intercellular adhesion molecule 1 | Facilitates immune cell adhesion in inflammation |
| VCAM1 | Vascular cell adhesion molecule 1 | Mediates leukocyte adhesion in cardiovascular response |
| CRP | C-reactive protein; acute phase protein | Systemic inflammation marker in NO2 exposure |
| PIF4 (Arabidopsis) | Transcription factor regulating growth | NO2 suppresses its activity to inhibit hypocotyl elongation |
How Is response to nitrogen dioxide Regulated?
The response to nitrogen dioxide is regulated at multiple levels. Inflammatory signaling pathways, such as NF-kB and MAPK, are activated upon NO2 exposure, leading to transcriptional upregulation of cytokines and adhesion molecules. In plants, NO2 modulates PIF4 activity, which is a key regulator of growth. Sex hormones may influence the response, as sex differences have been observed in human exposure studies. Additionally, antioxidant response elements (ARE) regulate the expression of detoxifying enzymes like HMOX1 and GCLC.
response to nitrogen dioxide and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| IL6 | Asthma, airway inflammation | Human bronchial epithelial cells (KO, overexpression) |
| TNF | Allergic airway disease | Mouse models of asthma (KO, knock-in) |
| PIF4 | Plant growth regulation | Arabidopsis thaliana (KO, point mutation) |
| CRP | Cardiovascular mortality | Human cohort studies, hepatocyte cell models (KO) |
| HMOX1 | Oxidative stress-related diseases | Macrophage cell lines (KO, overexpression) |
Asthma and Allergic Airway Disease
NO2 exposure potentiates the effects of inhaled allergens in allergic airways disease, leading to increased inflammation and airway hyper-responsiveness. Individuals with asthma may experience worsening symptoms after NO2 exposure, although the evidence for airway hyper-responsiveness is debated. Inflammatory mediators such as IL-6, TNF, and CXCL8 play central roles.
Cardiovascular Disease
Long-term exposure to NO2 is associated with increased cardiovascular mortality, as demonstrated in a nationwide cohort study. Systemic inflammation and oxidative stress are thought to mediate this effect, with markers like CRP and VCAM1 implicated. Sex modifies the response, with differential effects on cardiovascular outcomes.
Plant Growth and Development
In plants, NO2 suppresses hypocotyl elongation by inhibiting PIF4, affecting growth and development. This has implications for agriculture in polluted environments, where NO2 may alter crop growth patterns.
From response to nitrogen dioxide-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X mediate NO2-induced inflammation? | CRISPR knockout in human airway epithelial cells |
| What is the effect of a specific point mutation in gene Y on NO2 response? | Point mutation knock-in in cell lines |
| How does overexpression of gene Z affect NO2-induced oxidative stress? | Overexpression cell models |
| Does NO2 exposure alter PIF4 activity in plants? | Arabidopsis PIF4 knockout and tagged knock-in |
| What is the role of sex in NO2 response? | Humanized mouse models or sex-specific cell lines |
| Can CRISPR library screening identify novel NO2-responsive genes? | Genome-wide CRISPR knockout library in lung cells |
How to Study the response to nitrogen dioxide Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify NO2-responsive genes and pathways |
| Proteomics | Protein abundance and modifications | Quantify inflammatory mediators |
| CRISPR knockout screening | Gene function loss effects | Discover novel regulators of NO2 response |
| CRISPR activation screening | Gene overexpression effects | Identify enhancers of NO2 response |
| Cytokine multiplex assays | Secreted inflammatory proteins | Measure IL-6, TNF, CXCL8 in cell culture |
| Immunohistochemistry | Protein localization in tissues | Detect neutrophil infiltration in lungs |
| Controlled human exposure | Physiological and inflammatory responses | Assess airway hyper-responsiveness and biomarkers |
Transcriptomics and RNA-seq
RNA sequencing can identify global gene expression changes in response to NO2 exposure. This method has been used to uncover inflammatory pathways and novel responsive genes in human and animal models. It is particularly useful for hypothesis generation and biomarker discovery.
Proteomics and Cytokine Profiling
Proteomic approaches and multiplex cytokine assays measure protein-level changes in inflammatory mediators after NO2 exposure. These methods have quantified increases in IL-6, TNF, and CXCL8 in human studies. They provide functional validation of transcriptomic findings.
CRISPR Screening
Genome-wide CRISPR knockout or activation screens can identify genes that modulate cellular responses to NO2. This unbiased approach is powerful for discovering novel regulators of GO:0035713. Libraries targeting inflammatory pathways are particularly relevant.
Controlled Human Exposure and Animal Models
Controlled human exposure studies, such as those measuring inflammatory markers in bronchoalveolar lavage, provide direct evidence of NO2 effects. Animal models, including mice and rats, allow mechanistic dissection of pathways and genetic manipulation. Sex differences can be studied in these models.
How CRISPR Can Be Used to Study GO:0035713 response to nitrogen dioxide
Knockout
CRISPR knockout of candidate genes (e.g., IL6, TNF, HMOX1) in cell models can determine their necessity for NO2-induced inflammatory responses. For example, knocking out NFKB1 would test its role in mediating cytokine induction after NO2 exposure. This approach provides causal evidence in the GO:0035713 pathway.
Point Mutation
Introducing specific point mutations (e.g., in PIF4 or SOD2) can mimic naturally occurring variants or disrupt catalytic activity, allowing researchers to study their impact on NO2 response. This is useful for understanding structure-function relationships and genetic susceptibility.
Knock-in
Knock-in of tagged versions of genes (e.g., HMOX1-FLAG) enables tracking of protein localization and interactions during NO2 exposure. This can reveal dynamic changes in protein trafficking and complex formation. Knock-in of reporter genes (e.g., GFP) can also monitor transcriptional activity.
Overexpression
Overexpression of protective genes like HMOX1 or SOD2 can test whether increased levels mitigate NO2-induced oxidative stress and inflammation. Conversely, overexpression of pro-inflammatory genes can exacerbate responses. This approach helps identify therapeutic targets.
How EDITGENE Supports response to nitrogen dioxide Research
Researchers studying response to nitrogen dioxide-related genes often need to determine whether a candidate gene is causally involved in mediating cellular responses to NO2. EDITGENE provides comprehensive CRISPR-based services to enable such investigations, from knockout to overexpression and library screening.
Contact EDITGENE today to design your custom CRISPR model for response to nitrogen dioxide research.
Frequently Asked Questions About response to nitrogen dioxide
What is GO:0035713?
GO:0035713 is the Gene Ontology term for 'response to nitrogen dioxide', defined as any process that results in a change in state or activity of a cell or organism as a result of a nitrogen dioxide (NO2) stimulus.
What genes are involved in response to nitrogen dioxide?
Key genes include inflammatory cytokines (IL6, TNF, CXCL8), antioxidant enzymes (HMOX1, SOD2), and transcription factors (NFKB1, PIF4 in plants).
How does nitrogen dioxide cause inflammation?
NO2 exposure triggers release of inflammatory mediators like IL-6 and TNF, recruits neutrophils, and induces oxidative stress, leading to airway inflammation.
Is response to nitrogen dioxide the same in plants and humans?
No, the downstream effects differ: in plants, NO2 suppresses PIF4 to inhibit growth; in humans, it causes inflammation and cardiovascular effects.
What are the health effects of nitrogen dioxide exposure?
NO2 exposure is linked to asthma exacerbation, airway hyper-responsiveness, and increased cardiovascular mortality.
Does sex affect the response to nitrogen dioxide?
Yes, a controlled human exposure study found that sex modifies the inflammatory and oxidative stress response to NO2.
What model systems are used to study response to nitrogen dioxide?
Models include human bronchial epithelial cells, mouse models of asthma, Arabidopsis thaliana, and controlled human exposure studies.
How can CRISPR be used to study response to nitrogen dioxide?
CRISPR knockout, knock-in, and overexpression can test the causal role of specific genes in NO2-induced pathways, and library screens can identify novel regulators.
What is the role of PIF4 in response to nitrogen dioxide?
In Arabidopsis, NO2 suppresses PIF4 activity, leading to inhibited hypocotyl elongation.
What are the research methods for studying response to nitrogen dioxide?
Common methods include RNA-seq, proteomics, cytokine assays, CRISPR screening, and controlled human exposure.
Conclusion
GO:0035713 response to nitrogen dioxide is a critical biological process with implications for human health and plant biology. Understanding the genes and mechanisms involved can inform therapeutic strategies for pollution-related diseases and agricultural practices. EDITGENE provides the tools to dissect this response with precision.
References
- 1. Takahashi M et al.. 2024. Atmospheric nitrogen dioxide suppresses the activity of phytochrome interacting factor 4 to suppress hypocotyl elongation.. Planta 260(2):42 PMID: 38958765
- 2. Krishna MT et al.. 1999. Inflammatory mechanisms underlying potentiation of effects of inhaled aeroallergens in response to nitrogen dioxide in allergic airways disease.. Clin Exp Allergy 29(2):150-4 PMID: 10051716
- 4. Krishna MT et al.. 1996. Mediators of inflammation in response to air pollution: a focus on ozone and nitrogen dioxide.. J R Coll Physicians Lond 30(1):61-6 PMID: 8745367
- 5. Pulczinski JC et al.. 2026. Sex modifies response to ozone and nitrogen dioxide: a controlled human exposure study.. Inhal Toxicol 38(1):1-12 PMID: 41246912
- 6. Goodman JE et al.. 2017. Do individuals with asthma experience airway hyper-responsiveness after exposure to nitrogen dioxide?. Regul Toxicol Pharmacol 89:279-287 PMID: 28751262
- 7. Devlin RB et al.. 1999. Inflammatory response in humans exposed to 2.0 ppm nitrogen dioxide.. Inhal Toxicol 11(2):89-109 PMID: 10380161
- 8. Li X et al.. 2026. Effects of long-term exposure to nitrogen dioxide with cardiovascular mortality: Evidence from a nationwide cohort study.. Ecotoxicol Environ Saf 313:119950 PMID: 41806667
