GO:2000563 positive regulation of CD4-positive, alpha-beta T cell proliferation: Immune Regulation, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:2000563 describes any process that activates or increases the frequency, rate, or extent of CD4-positive, alpha-beta T cell proliferation, a central event in adaptive immunity.
• Prostaglandin E2 and cytokines such as interleukin-10 and transforming growth factor beta can modulate CD4+ T cell responses, including proliferation and polarization.
• Dengue virus-infected dendritic cells impair CD4+ T cell polarization, highlighting how pathogens can disrupt positive regulation of CD4+ T cell proliferation.
• CD4+ T cell exhaustion in sarcoidosis reverses with clinical resolution, linking positive regulation of proliferation to disease outcome.
• Spontaneous proliferation of H2M-/- CD4 T cells causes acute hepatocellular necrosis, demonstrating that dysregulated positive regulation can drive immunopathology.
• Key genes and pathways involved include TCR signaling components, costimulatory molecules, cytokines (IL-2, IL-10, TGF-beta), and cell cycle regulators such as p21.
Description
Positive regulation of CD4-positive, alpha-beta T cell proliferation (GO:2000563) is a biological process that encompasses any mechanism which activates or increases the frequency, rate, or extent of proliferation of CD4-positive, alpha-beta T cells. These cells are essential coordinators of adaptive immunity, and their controlled expansion is required for effective responses against pathogens while preventing autoimmunity. Understanding the positive regulation of this process is therefore critical for immunology research and therapeutic development. Experimental evidence shows that various stimuli, including prostaglandin E2, can regulate CD4+ T cell immune responses toward Th2 cell development, which involves proliferation and differentiation. Similarly, interleukin-10 and transforming growth factor beta regulate human CD4+ alphabeta T-cell-receptor-positive T-cell responses to Mycobacterium tuberculosis, demonstrating cytokine-mediated control of CD4+ T cell activity. Pathogens such as dengue virus can impair CD4+ T cell polarization through infected dendritic cells, indicating that positive regulation can be subverted during infection. In disease settings, CD4+ T cell exhaustion in pulmonary sarcoidosis reverses with clinical resolution, suggesting that restoring positive regulation of proliferation may be beneficial. Conversely, spontaneous proliferation of H2M-/- CD4 T cells results in unusual acute hepatocellular necrosis, illustrating that unchecked positive regulation can cause tissue damage. Anergic T cells display specific molecular fingerprints that reflect impaired proliferative capacity, further underscoring the importance of positive regulatory pathways. Additionally, lack of cell cycle inhibitor p21 and low CD4+ T cell suppression in newborns after exposure to IFN-beta links cell cycle control to CD4+ T cell proliferation. Antigen-specific T cell repertoire modification of CD4+CD25+ regulatory T cells also affects CD4+ T cell responses, showing that regulatory T cells can influence the positive regulation of conventional CD4+ T cell proliferation. Thus, GO:2000563 is a nexus for understanding immune activation, tolerance, and disease.
positive regulation of CD4-positive, alpha-beta T cell proliferation At A Glance
| GO ID | GO:2000563 |
|---|---|
| GO term | positive regulation of CD4-positive, alpha-beta T cell proliferation |
| Ontology | biological_process |
| Synonym | none |
| Major function | Activates or increases the frequency, rate, or extent of CD4-positive, alpha-beta T cell proliferation |
| Related cell type | CD4-positive, alpha-beta T cells (helper T cells) |
| Biological context | Adaptive immune responses, cytokine signaling, T cell activation |
| Regulatory inputs | Cytokines (e.g., IL-2, IL-10, TGF-beta), prostaglandins, costimulatory signals |
| Disease relevance | Infection, autoimmunity, sarcoidosis, hepatocellular necrosis, immune exhaustion |
What Is GO:2000563?
GO:2000563, positive regulation of CD4-positive, alpha-beta T cell proliferation, is defined as any process that activates or increases the frequency, rate, or extent of CD4-positive, alpha-beta T cell proliferation. This includes molecular signals, such as cytokine receptor engagement, costimulation, and intracellular signaling cascades, that promote the entry of CD4+ alpha-beta T cells into the cell cycle and their subsequent division. The term covers positive regulation at any level, from receptor activation to gene expression changes that drive proliferation.
Why Is positive regulation of CD4-positive, alpha-beta T cell proliferation Important in Cell Biology?
Positive regulation of CD4-positive, alpha-beta T cell proliferation is fundamental to adaptive immunity because it determines the magnitude and duration of helper T cell responses. Dysregulation can lead to immunodeficiency, autoimmunity, chronic inflammation, or impaired pathogen clearance. For researchers, this GO term provides a framework to study how cytokines, costimulatory molecules, and intracellular pathways control CD4+ T cell expansion, with implications for vaccine design, cancer immunotherapy, and treatment of infectious and autoimmune diseases.
• Controls the expansion of CD4+ helper T cells, which orchestrate B cell and cytotoxic T cell responses.
• Cytokines such as IL-10 and TGF-beta modulate CD4+ T cell responses to pathogens like Mycobacterium tuberculosis.
• Prostaglandin E2 regulates CD4+ T cell immune responses toward Th2 development, affecting proliferation and polarization.
• Pathogens such as dengue virus can impair CD4+ T cell polarization via infected dendritic cells.
• CD4+ T cell exhaustion in sarcoidosis reverses with clinical resolution, linking proliferation regulation to disease outcome.
• Dysregulated positive regulation can cause immunopathology, as seen in H2M-/- CD4 T cell-induced hepatocellular necrosis.
• Anergic T cells show defective proliferation, highlighting the importance of positive regulatory pathways.
• Cell cycle inhibitor p21 influences CD4+ T cell suppression in newborns after IFN-beta exposure.
• Regulatory T cells can modify the CD4+ T cell repertoire, indirectly affecting positive regulation of conventional T cell proliferation.
• Understanding this process aids development of therapies for infections, autoimmunity, and cancer.
What Happens During positive regulation of CD4-positive, alpha-beta T cell proliferation?
Recognition of Antigen and Costimulation
In simple terms: T cells need to recognize a specific target and receive a second 'go' signal to start dividing.
Positive regulation begins when a CD4-positive, alpha-beta T cell encounters its cognate antigen presented by MHC class II molecules on an antigen-presenting cell. This TCR signal alone is insufficient; costimulatory signals, such as CD28 engagement, are required to fully activate the cell. In the context of Mycobacterium tuberculosis, interleukin-10 and transforming growth factor beta regulate human CD4+ alphabeta T-cell-receptor-positive T-cell responses, indicating that cytokine signals can modulate this early recognition phase. Similarly, prostaglandin E2 can regulate CD4+ T cell immune responses toward Th2 cell development, influencing the outcome of activation. Dendritic cells infected with dengue virus show impaired ability to polarize CD4+ T cells, suggesting that pathogen interference with antigen presentation or costimulation can disrupt positive regulation.
Cytokine-Driven Proliferative Signals
In simple terms: Chemical messengers called cytokines tell the T cell to multiply.
After activation, CD4+ T cells produce and respond to cytokines that drive proliferation. Interleukin-2 is a key growth factor, but other cytokines such as IL-10 and TGF-beta can also influence the proliferative response. Rojas et al. demonstrated that IL-10 and TGF-beta regulate human CD4+ alphabeta T-cell-receptor-positive T-cell responses to Mycobacterium tuberculosis, which includes effects on proliferation. Prostaglandin E2, a lipid mediator, can also regulate CD4+ T cell immune responses toward Th2 cell development, a process that involves proliferation. These signals converge on intracellular pathways that promote cell cycle entry.
Intracellular Signaling and Cell Cycle Entry
In simple terms: Inside the cell, a chain of molecular switches turns on the division machinery.
Cytokine receptor engagement activates JAK-STAT, PI3K-AKT, and MAPK pathways, leading to expression of cyclins and CDKs that drive cell cycle progression. The cell cycle inhibitor p21 (CDKN1A) can restrain proliferation; lack of p21 and low CD4+ T cell suppression in newborns after exposure to IFN-beta suggests that p21 modulates positive regulation. Anergic T cells exhibit a molecular fingerprint of defective proliferation, indicating that positive regulatory pathways are blocked in anergy. Spontaneous proliferation of H2M-/- CD4 T cells results in unusual acute hepatocellular necrosis, showing that unchecked cell cycle entry can have severe consequences.
Modulation by Regulatory T Cells
In simple terms: Regulatory T cells can put the brakes on other T cells, affecting how much they multiply.
CD4+CD25+ regulatory T cells can suppress the proliferation of conventional CD4+ T cells. Hayashi et al. showed that antigen-specific T cell repertoire modification of CD4+CD25+ regulatory T cells affects CD4+ T cell responses, indirectly influencing positive regulation of proliferation. In sarcoidosis, local and systemic CD4+ T cell exhaustion reverses with clinical resolution, suggesting that regulatory mechanisms and exhaustion pathways intersect with positive regulation. Thus, the net positive regulation of CD4+ T cell proliferation is a balance between activating and inhibitory signals.
Key Genes Involved in GO:2000563 positive regulation of CD4-positive, alpha-beta T cell proliferation
The following genes and proteins are involved in the positive regulation of CD4-positive, alpha-beta T cell proliferation, based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| IL2 | T cell growth factor | Promotes proliferation after activation |
| IL10 | Immunoregulatory cytokine | Regulates CD4+ T cell responses to M. tuberculosis |
| TGFB1 | Immunoregulatory cytokine | Regulates CD4+ T cell responses to M. tuberculosis |
| PTGS2 | Prostaglandin-endoperoxide synthase 2 | Involved in PGE2 synthesis affecting Th2 development |
| CD28 | Costimulatory receptor | Provides second signal for T cell activation |
| CD3E | TCR signaling component | Transduces antigen recognition signals |
| CD4 | Coreceptor for MHC class II | Defines CD4+ T cell subset |
| CDKN1A | Cell cycle inhibitor p21 | Restrains proliferation; linked to IFN-beta exposure |
| FOXP3 | Regulatory T cell transcription factor | Modulates suppression of conventional T cells |
| IL2RA | IL-2 receptor alpha chain (CD25) | Enhances IL-2 signaling for proliferation |
| H2M | MHC class II-like molecule | Its loss causes spontaneous CD4 T cell proliferation |
| IFNB1 | Type I interferon | Exposure linked to low p21 and CD4+ T cell suppression |
| TCR | T cell receptor | Recognizes antigen-MHC complexes |
| CD80 | Costimulatory ligand | Binds CD28 on T cells |
| CD86 | Costimulatory ligand | Binds CD28 on T cells |
| STAT5 | Transcription factor | Mediates cytokine-driven proliferation signals |
| NFKB1 | Transcription factor | Activates genes promoting T cell proliferation |
How Is positive regulation of CD4-positive, alpha-beta T cell proliferation Regulated?
Positive regulation of CD4-positive, alpha-beta T cell proliferation is controlled by a network of extracellular and intracellular signals. Cytokines such as IL-2, IL-10, and TGF-beta can either promote or modulate proliferation depending on context. Prostaglandin E2 influences Th2 development, which involves proliferative expansion. Costimulatory molecules like CD28 provide essential second signals. Intracellularly, cell cycle inhibitors such as p21 can restrain proliferation; lack of p21 in newborns after IFN-beta exposure is associated with low CD4+ T cell suppression. Regulatory T cells can suppress conventional T cell proliferation, adding another layer of control. In disease, exhaustion pathways can reverse with clinical resolution, indicating dynamic regulation.
positive regulation of CD4-positive, alpha-beta T cell proliferation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| IL10 | Tuberculosis susceptibility | KO mouse or human PBMC cultures |
| TGFB1 | Tuberculosis and fibrosis | Conditional KO or overexpression |
| CDKN1A | Neonatal immune suppression | p21 KO mice with IFN-beta exposure |
| H2M | Autoimmune hepatocellular necrosis | H2M-/- mouse model |
| FOXP3 | Autoimmunity and immune dysregulation | FOXP3 KO or knock-in reporter mice |
Infectious Diseases
Pathogens can interfere with positive regulation of CD4+ T cell proliferation. Dengue virus-infected dendritic cells show impaired CD4+ T cell polarization, which may limit effective proliferation. In tuberculosis, IL-10 and TGF-beta regulate CD4+ T cell responses, potentially suppressing protective proliferation. These examples highlight how pathogens exploit regulatory pathways to evade immunity.
Autoimmunity and Inflammatory Disorders
Dysregulated positive regulation can contribute to immunopathology. Spontaneous proliferation of H2M-/- CD4 T cells causes acute hepatocellular necrosis, demonstrating that unchecked CD4+ T cell expansion can damage tissues. In sarcoidosis, CD4+ T cell exhaustion reverses with clinical resolution, suggesting that excessive or persistent activation may drive disease. Anergic T cells show defective proliferation, and breaking anergy could lead to autoimmunity.
Cancer and Immunotherapy
Positive regulation of CD4+ T cell proliferation is critical for effective anti-tumor immunity. Enhancing this process is a goal of cancer immunotherapy, while tumor-induced suppression of CD4+ T cell proliferation can lead to immune evasion. Although direct citations in this list focus on infection and inflammation, the principles of cytokine and costimulatory regulation apply broadly.
From positive regulation of CD4-positive, alpha-beta T cell proliferation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X promote CD4+ T cell proliferation? | Knockout of gene X in primary CD4+ T cells or mice |
| Does a point mutation in gene Y affect proliferation? | Point-mutation knock-in mice or cell lines |
| Does overexpression of gene Z enhance proliferation? | Retroviral or lentiviral overexpression in CD4+ T cells |
| How does gene W affect T cell polarization? | Knock-in reporter mice for cytokines |
| What is the role of gene V in T cell exhaustion? | Chronic infection or tumor models with KO |
| Can CRISPR screening identify new regulators? | Genome-wide CRISPR knockout library in primary T cells |
How to Study the positive regulation of CD4-positive, alpha-beta T cell proliferation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CFSE dilution | Cell division history | Quantify CD4+ T cell proliferation |
| Flow cytometry | Surface markers and intracellular cytokines | Identify and phenotype proliferating cells |
| ELISA | Cytokine concentrations | Measure IL-2, IL-10, TGF-beta |
| RNA-seq | Global gene expression | Identify pathways driving proliferation |
| Single-cell RNA-seq | Transcriptomes of individual cells | Study heterogeneity in proliferation |
| CRISPR knockout screen | Gene function on proliferation | Discover novel regulators |
| Western blot | Protein expression and phosphorylation | Validate signaling pathways |
| Immunohistochemistry | Tissue localization of CD4+ T cells | Assess proliferation in situ |
Flow Cytometry and CFSE Dilution
Flow cytometry with CFSE or CellTrace Violet labeling is the gold standard to measure CD4+ T cell proliferation. Cells are labeled and stimulated, then dilution of the dye indicates division. This method can be combined with surface markers to identify CD4+ alpha-beta T cells and intracellular staining for cytokines.
Cytokine Profiling and ELISA
Measuring cytokines such as IL-2, IL-10, and TGF-beta in culture supernatants by ELISA or multiplex assays helps link positive regulation to specific signals. Prostaglandin E2 can also be measured by ELISA or mass spectrometry.
Transcriptomics and Single-Cell RNA-seq
RNA-seq of sorted CD4+ T cells before and after stimulation reveals gene expression changes driving proliferation. Single-cell RNA-seq can identify heterogeneity in proliferative responses and rare regulatory populations.
CRISPR Screens and Functional Genomics
Genome-wide CRISPR knockout or activation screens in primary CD4+ T cells can identify novel positive regulators of proliferation. These screens are powerful for discovering genes that enhance or suppress proliferation under specific conditions.
How CRISPR Can Be Used to Study GO:2000563 positive regulation of CD4-positive, alpha-beta T cell proliferation
Knockout
CRISPR knockout of candidate genes in primary CD4+ T cells or cell lines can determine whether a gene is required for positive regulation of proliferation. For example, knocking out CDKN1A (p21) may enhance proliferation, while knocking out IL2RA may reduce it. EDITGENE provides custom knockout cell models to test these hypotheses.
Point Mutation
Point mutations can mimic disease-associated variants or phospho-mimetic/phospho-dead mutations. For instance, mutating specific residues in STAT5 or other signaling molecules can reveal their role in proliferation. EDITGENE offers precise point-mutation knock-in services to study such effects.
Knock-in
Knock-in of reporter genes (e.g., fluorescent proteins) or epitope tags allows tracking of CD4+ T cell proliferation and gene expression in real time. Tagging endogenous IL2 or FOXP3 can provide insights into regulation. EDITGENE delivers tagged knock-in models for dynamic studies.
Overexpression
Overexpression of positive regulators, such as IL2 or constitutively active STAT5, can drive proliferation even in the absence of external stimuli. This approach helps identify sufficiency. EDITGENE provides overexpression cell models using lentiviral or transposon systems.
How EDITGENE Supports positive regulation of CD4-positive, alpha-beta T cell proliferation Research
Researchers studying positive regulation of CD4-positive, alpha-beta T cell proliferation-related genes often need to determine whether a candidate gene is causally involved in promoting or restraining T cell expansion. This requires precise genetic manipulation, functional assays, and often high-throughput screening. EDITGENE offers a comprehensive suite of CRISPR services to accelerate such discoveries.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of CD4-positive, alpha-beta T cell proliferation research.
Frequently Asked Questions About positive regulation of CD4-positive, alpha-beta T cell proliferation
What is GO:2000563?
GO:2000563 is the Gene Ontology term for positive regulation of CD4-positive, alpha-beta T cell proliferation, defined as any process that activates or increases the frequency, rate, or extent of CD4-positive, alpha-beta T cell proliferation.
What genes are involved in positive regulation of CD4-positive, alpha-beta T cell proliferation?
Key genes include IL2, IL10, TGFB1, CD28, CD3E, CD4, CDKN1A, FOXP3, and others involved in cytokine signaling and cell cycle control.
How is CD4+ T cell proliferation measured?
Common methods include CFSE dilution, flow cytometry, and EdU incorporation to track cell division.
What diseases are associated with dysregulated CD4+ T cell proliferation?
Infections like tuberculosis and dengue, autoimmune conditions, sarcoidosis, and hepatocellular necrosis have been linked to altered regulation.
What is the role of cytokines in CD4+ T cell proliferation?
Cytokines such as IL-2 promote proliferation, while IL-10 and TGF-beta can modulate responses depending on context.
Can CRISPR be used to study CD4+ T cell proliferation?
Yes, CRISPR knockout, knock-in, and overexpression models are powerful tools to dissect gene function in CD4+ T cell proliferation.
What is the difference between positive and negative regulation of CD4+ T cell proliferation?
Positive regulation increases proliferation, while negative regulation decreases it; both are essential for immune balance.
Which cell types are CD4-positive, alpha-beta T cells?
They are helper T cells expressing the CD4 coreceptor and an alpha-beta T cell receptor, which recognize MHC class II antigens.
How does p21 affect CD4+ T cell proliferation?
p21 (CDKN1A) is a cell cycle inhibitor; its lack is associated with low CD4+ T cell suppression in newborns after IFN-beta exposure.
What models are used to study positive regulation of CD4+ T cell proliferation?
Models include primary human and mouse CD4+ T cells, knockout mice, and CRISPR-engineered cell lines.
Conclusion
GO:2000563, positive regulation of CD4-positive, alpha-beta T cell proliferation, is a critical biological process that governs the expansion of helper T cells. Its dysregulation contributes to infectious diseases, autoimmunity, and immunopathology. The cited literature highlights the roles of cytokines, costimulatory molecules, and cell cycle regulators in this process. Continued research using CRISPR and functional genomics will uncover new therapeutic targets.
References
- 1. Bao YS et al.. 2011. The regulation of CD4+ T cell immune responses toward Th2 cell development by prostaglandin E2.. Int Immunopharmacol 11(10):1599-605 PMID: 21635971
- 2. Rojas RE et al.. 1999. Regulation of human CD4(+) alphabeta T-cell-receptor-positive (TCR(+)) and gammadelta TCR(+) T-cell responses to Mycobacterium tuberculosis by interleukin-10 and transforming growth factor beta.. Infect Immun 67(12):6461-72 PMID: 10569764
- 3. Chase AJ et al.. 2011. Impairment of CD4+ T cell polarization by dengue virus-infected dendritic cells.. J Infect Dis 203(12):1763-74 PMID: 21606535
- 4. Hawkins C et al.. 2017. Local and Systemic CD4(+) T Cell Exhaustion Reverses with Clinical Resolution of Pulmonary Sarcoidosis.. J Immunol Res 2017:3642832 PMID: 29234685
- 5. Do JS et al.. 2014. Spontaneous proliferation of H2M-/- CD4 T cells results in unusual acute hepatocellular necrosis.. PLoS One 9(10):e110516 PMID: 25313460
- 6. Lechner O et al.. 2001. Fingerprints of anergic T cells.. Curr Biol 11(8):587-95 PMID: 11369203
- 7. Jans J et al.. 2021. Lack of Cell Cycle Inhibitor p21 and Low CD4(+) T Cell Suppression in Newborns After Exposure to IFN-β.. Front Immunol 12:652965 PMID: 33912177
- 8. Hayashi Y et al.. 2004. Antigen-specific T cell repertoire modification of CD4+CD25+ regulatory T cells.. J Immunol 172(9):5240-8 PMID: 15100262
