GO:2000451 positive regulation of CD8-positive, alpha-beta T cell extravasation: Immune Surveillance Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:2000451 describes any process that increases the frequency, rate, or extent of CD8-positive, alpha-beta T cell extravasation, a key step in immune surveillance.
• CD8+CD28+ TCRαβ+ CD62L-high T cells are a subset with high proliferative capacity and extravasation potential, relevant to both healthy and asthmatic subjects.
• The process is essential for delivering cytotoxic T cells to peripheral tissues and tumors, and its dysregulation contributes to autoimmunity, chronic inflammation, and cancer immune evasion.
• Studying this GO term requires tracking T cell migration across endothelial barriers, often using flow cytometry, live imaging, and transcriptomic profiling.
• CRISPR-based models (knockout, knock-in, overexpression) enable causal testing of genes that regulate CD8+ T cell extravasation.
• EDITGENE provides end-to-end services to dissect this pathway, from library screening to bioinformatics.
Description
GO:2000451, positive regulation of CD8-positive, alpha-beta T cell extravasation, is a biological process that enhances the movement of CD8-positive, alpha-beta T cells from blood vessels into tissues. This step is critical for immune surveillance, as it allows cytotoxic T cells to reach sites of infection, inflammation, or tumor growth. Understanding how this process is regulated can reveal therapeutic targets for diseases ranging from asthma to cancer. Recent studies have characterized CD8+CD28+ TCRαβ+ CD62L-high T cell subsets that exhibit high proliferative capacity and extravasation potential in both healthy and asthmatic individuals. These findings highlight the importance of this GO term in respiratory and systemic immune responses. Researchers studying this process need robust experimental models to identify the molecular players that positively regulate T cell extravasation.
positive regulation of CD8-positive, alpha-beta T cell extravasation At A Glance
| GO ID | GO:2000451 |
|---|---|
| GO term | positive regulation of CD8-positive, alpha-beta T cell extravasation |
| Ontology | biological_process |
| Synonym | none |
| Major function | Enhances the migration of CD8+ αβ T cells from blood vessels into tissues |
| Related cell type | CD8-positive, alpha-beta T cells, including CD8+CD28+ TCRαβ+ CD62L-high subsets |
| Associated process | Immune surveillance, inflammation, asthma, cancer immunity |
| Research relevance | Target for modulating T cell infiltration in disease |
What Is GO:2000451?
According to QuickGO, GO:2000451 is defined as any process that activates or increases the frequency, rate, or extent of CD8-positive, alpha-beta T cell extravasation. In other words, it encompasses molecular and cellular events that promote the exit of CD8+ αβ T cells from the bloodstream into peripheral tissues, a key step in adaptive immunity.
Why Is positive regulation of CD8-positive, alpha-beta T cell extravasation Important in Cell Biology?
Positive regulation of CD8-positive, alpha-beta T cell extravasation is fundamental to adaptive immunity because it determines whether cytotoxic T cells can reach infected or malignant tissues. Dysregulation of this process can lead to insufficient immune control of tumors or pathogens, or conversely to excessive tissue infiltration and autoimmune damage. In asthma, specific CD8+ T cell subsets with high extravasation potential have been linked to disease severity, suggesting that targeting this process could offer therapeutic benefit.
• Enables cytotoxic T cells to reach tumor sites, influencing cancer immunotherapy outcomes.
• Contributes to pathogen clearance by delivering effector T cells to infected tissues.
• Dysregulation can promote autoimmune tissue damage due to excessive T cell infiltration.
• In asthma, CD8+CD28+ TCRαβ+ CD62L-high T cells with high proliferative capacity may exacerbate airway inflammation.
• Provides a mechanistic basis for developing drugs that modulate T cell trafficking.
• Helps researchers understand why some patients respond poorly to immune checkpoint inhibitors.
• Guides the design of adoptive T cell therapies by optimizing extravasation potential.
• Offers biomarkers for monitoring immune responses in inflammatory diseases.
What Happens During positive regulation of CD8-positive, alpha-beta T cell extravasation?
T cell activation and subset specification
In simple terms: First, T cells get activated and become the right type to leave blood vessels.
Positive regulation begins with signals that activate CD8+ αβ T cells and promote the expansion of subsets with high extravasation potential, such as CD8+CD28+ TCRαβ+ CD62L-high cells. These cells exhibit high proliferative capacity and are found in both healthy and asthmatic subjects, suggesting that activation state and subset composition influence extravasation efficiency.
Adhesion molecule upregulation
In simple terms: The T cells put more sticky molecules on their surface to grab onto blood vessel walls.
Regulatory signals increase the expression of adhesion molecules and chemokine receptors on CD8+ T cells, enabling them to tether, roll, and arrest on endothelial cells. This step is essential for the subsequent migration into tissues and is a target of positive regulation.
Chemokine-guided migration
In simple terms: Chemical signals guide the T cells to the right exit points.
Chemokines presented on endothelial surfaces activate integrins on CD8+ T cells, leading to firm adhesion and polarization necessary for extravasation. Positive regulation of this process enhances the sensitivity of T cells to chemotactic gradients, increasing the frequency of successful extravasation events.
Transendothelial migration
In simple terms: The T cells squeeze through the blood vessel wall into the tissue.
Once firmly adhered, CD8+ T cells undergo transendothelial migration, a step that can be positively regulated by cytokines and growth factors. This process requires dynamic cytoskeletal rearrangements and is influenced by the activation state of the T cell, as seen in CD8+CD28+ subsets with high proliferative capacity.
Tissue retention and effector function
In simple terms: After entering the tissue, the T cells stay there and do their job.
Positive regulation may also involve signals that promote retention of CD8+ T cells within tissues, allowing them to exert cytotoxic functions. In asthma, such retained cells may contribute to chronic inflammation, highlighting the dual role of this process in protection and pathology.
Key Genes Involved in GO:2000451 positive regulation of CD8-positive, alpha-beta T cell extravasation
The following genes and proteins are involved in the regulation of CD8-positive, alpha-beta T cell extravasation, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CD28 | Costimulatory receptor on T cells | Marks CD8+CD28+ subsets with high extravasation potential |
| TCRαβ | T cell receptor for antigen recognition | Defines αβ T cell lineage and activation state |
| CD62L (L-selectin) | Adhesion molecule for tethering to endothelium | High expression identifies CD62L-high T cells with extravasation capacity |
| CD8 | Coreceptor for MHC class I | Defines CD8+ T cell subset |
| CD3 | T cell receptor signaling component | Required for activation-induced extravasation |
| CXCR3 | Chemokine receptor | Promotes migration toward inflamed tissues |
| CCR7 | Chemokine receptor | Guides T cell homing to lymph nodes |
| LFA-1 (ITGAL) | Integrin for firm adhesion | Mediates arrest on endothelium |
| VLA-4 (ITGA4) | Integrin for adhesion | Supports T cell migration across vascular endothelium |
| ICAM-1 | Endothelial ligand for integrins | Facilitates T cell arrest and transmigration |
| VCAM-1 | Endothelial ligand for VLA-4 | Mediates adhesion in inflamed tissues |
| CD44 | Adhesion and migration molecule | Involved in T cell extravasation and tissue retention |
| IFN-γ | Cytokine | Enhances endothelial activation and T cell recruitment |
| TNF-α | Cytokine | Upregulates adhesion molecules on endothelium |
| IL-2 | Growth factor | Promotes T cell proliferation and survival |
| MMP-2/9 | Matrix metalloproteinases | Facilitate basement membrane breakdown during extravasation |
| RhoA | Small GTPase | Regulates cytoskeletal dynamics for migration |
How Is positive regulation of CD8-positive, alpha-beta T cell extravasation Regulated?
The process of positive regulation of CD8-positive, alpha-beta T cell extravasation is controlled by a network of cytokines, chemokines, and adhesion molecules. For example, CD8+CD28+ TCRαβ+ CD62L-high T cells exhibit high proliferative capacity and are subject to regulation by costimulatory signals through CD28. In asthmatic subjects, the frequency and activation state of these cells are altered, suggesting that inflammatory mediators modulate this process. Additionally, integrin signaling and chemokine receptor activation are key regulatory nodes that can be targeted to enhance or inhibit extravasation.
positive regulation of CD8-positive, alpha-beta T cell extravasation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CD28 | Asthma, autoimmune inflammation | CD28 knockout mice or human T cell lines |
| CD62L | Asthma, immune surveillance | CD62L knock-in reporter for tracking extravasation |
| CXCR3 | Inflammatory diseases | CXCR3 knockout or overexpression in T cells |
| IFN-γ | Cancer, autoimmunity | IFN-γ knockout mice or overexpression models |
| MMP-9 | Cancer metastasis, inflammation | MMP-9 knockout or pharmacological inhibition |
Asthma and allergic airway inflammation
In asthma, CD8+CD28+ TCRαβ+ CD62L-high T cells with high proliferative capacity are present and may contribute to airway inflammation through enhanced extravasation into lung tissue. Positive regulation of this process could exacerbate disease, making it a potential target for therapeutic intervention.
Cancer immunotherapy
Efficient extravasation of CD8+ T cells into tumors is required for effective immune checkpoint blockade and adoptive T cell therapies. Positive regulation of this process may improve tumor infiltration and clinical responses, while its inhibition could lead to immune evasion.
Autoimmune diseases
Excessive extravasation of autoreactive CD8+ T cells into tissues can drive autoimmune pathology. Modulating positive regulation of this process might reduce tissue damage in conditions such as multiple sclerosis or type 1 diabetes.
From positive regulation of CD8-positive, alpha-beta T cell extravasation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate CD8+ T cell extravasation? | Gene X knockout in primary CD8+ T cells followed by transwell migration assay |
| What is the effect of a point mutation in gene Y on extravasation? | CRISPR point-mutation knock-in in T cell lines or primary cells |
| Can overexpression of gene Z enhance tumor infiltration? | Lentiviral overexpression in CD8+ T cells adoptively transferred into mice |
| How does CD28 signaling affect extravasation? | CD28 knockout or knock-in reporter mice |
| What is the role of CD62L in extravasation? | CD62L knockout or tagged knock-in for live imaging |
| Can CRISPR library screening identify novel regulators? | Genome-wide knockout library in primary CD8+ T cells followed by in vivo selection |
How to Study the positive regulation of CD8-positive, alpha-beta T cell extravasation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Flow cytometry | Surface marker expression and cell frequency | Identify CD8+CD28+ CD62L-high subsets |
| Transwell migration | Rate of cell migration across endothelial barrier | Test gene function in extravasation |
| Intravital microscopy | Real-time extravasation events in vivo | Study dynamics in animal models |
| RNA-seq | Transcriptional profiles | Discover regulators of extravasation |
| Proteomics | Protein expression and modifications | Identify signaling changes |
| CRISPR screening | Gene essentiality for extravasation | Unbiased discovery of regulators |
| Adoptive transfer | In vivo homing and infiltration | Evaluate therapeutic potential |
| Immunohistochemistry | Tissue localization of T cells | Assess infiltration in disease models |
Flow cytometry and cell sorting
Flow cytometry is used to identify and quantify CD8+CD28+ TCRαβ+ CD62L-high T cell subsets and to assess their extravasation potential in healthy and asthmatic subjects. Cell sorting enables isolation of these subsets for downstream functional assays.
Transwell migration assays
In vitro transwell systems measure the ability of CD8+ T cells to migrate across endothelial monolayers in response to chemokines, providing a quantitative readout of extravasation. This method can be combined with gene knockout or overexpression to test causality.
Live imaging in animal models
Intravital microscopy allows real-time visualization of CD8+ T cell extravasation in tissues of living mice, revealing dynamic interactions with endothelium. This approach is valuable for studying positive regulators in vivo.
Transcriptomic and proteomic profiling
RNA-seq and mass spectrometry can identify genes and proteins differentially expressed in T cell subsets with high versus low extravasation capacity, uncovering novel regulatory pathways. These omics approaches are often integrated with CRISPR screens.
How CRISPR Can Be Used to Study GO:2000451 positive regulation of CD8-positive, alpha-beta T cell extravasation
Knockout
CRISPR knockout of candidate genes in CD8+ T cells can determine whether they are required for extravasation. For example, knocking out CD28 or CD62L reduces the frequency of extravasation in transwell assays.
Point Mutation
Point mutations can be introduced to mimic disease-associated variants or to dissect specific phosphorylation sites in signaling proteins that regulate extravasation. This approach helps distinguish between loss-of-function and gain-of-function effects.
Knock-in
Knock-in of reporter genes or tags allows tracking of specific T cell subsets and their extravasation in vivo. For instance, tagging CD62L with a fluorescent protein enables live imaging of T cell migration.
Overexpression
Overexpression of positive regulators, such as chemokine receptors or integrins, can enhance extravasation and improve tumor infiltration in adoptive T cell therapy models. This strategy is used to boost immune responses.
How EDITGENE Supports positive regulation of CD8-positive, alpha-beta T cell extravasation Research
Researchers studying positive regulation of CD8-positive, alpha-beta T cell extravasation-related genes often need to determine whether a candidate gene is causally involved in this process. EDITGENE provides a comprehensive suite of CRISPR services to accelerate such investigations, from gene knockout to library screening and bioinformatics.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of CD8-positive, alpha-beta T cell extravasation research.
Frequently Asked Questions About positive regulation of CD8-positive, alpha-beta T cell extravasation
What is GO:2000451?
GO:2000451 is a Gene Ontology term for any process that activates or increases the frequency, rate, or extent of CD8-positive, alpha-beta T cell extravasation.
What genes are involved in positive regulation of CD8-positive, alpha-beta T cell extravasation?
Key genes include CD28, CD62L, TCRαβ, chemokine receptors like CXCR3, and integrins such as LFA-1 and VLA-4.
How is CD8-positive, alpha-beta T cell extravasation studied?
Researchers use flow cytometry, transwell migration assays, intravital microscopy, and CRISPR screens to study this process.
Why is CD8-positive, alpha-beta T cell extravasation important in asthma?
In asthma, CD8+CD28+ TCRαβ+ CD62L-high T cells with high proliferative capacity may extravasate into airways and worsen inflammation.
Can CRISPR be used to study CD8-positive, alpha-beta T cell extravasation?
Yes, CRISPR knockout, knock-in, and overexpression models allow causal testing of genes regulating extravasation.
What diseases are linked to dysregulated CD8-positive, alpha-beta T cell extravasation?
Asthma, cancer, and autoimmune diseases are associated with altered extravasation of CD8+ T cells.
What is the role of CD62L in CD8-positive, alpha-beta T cell extravasation?
CD62L (L-selectin) mediates tethering and rolling on endothelium, and high expression marks T cells with extravasation potential.
How does CD28 signaling affect CD8-positive, alpha-beta T cell extravasation?
CD28 costimulation promotes the expansion of CD8+CD28+ subsets with high proliferative capacity and extravasation ability.
What methods measure CD8-positive, alpha-beta T cell extravasation?
Transwell migration, intravital microscopy, and adoptive transfer models are commonly used.
What services does EDITGENE offer for studying this GO term?
EDITGENE provides knockout, point mutation, knock-in, overexpression, CRISPR library screening, and bioinformatics services.
Conclusion
GO:2000451, positive regulation of CD8-positive, alpha-beta T cell extravasation, is a critical biological process that governs immune surveillance and tissue inflammation. Understanding its molecular regulators can lead to new therapies for asthma, cancer, and autoimmune diseases. EDITGENE offers comprehensive CRISPR solutions to dissect this pathway and accelerate translational research.
References
- 1. Pietruczuk M et al.. 2021. Dynamics and proliferative capacities of CD8(+)CD28(+)TCRαβ(+)CD62L(high) T-cell subsets in healthy and asthmatic subjects.. J Biol Regul Homeost Agents 35(2):485-494 PMID: 33985326
