GO:0002507 tolerance induction: Immune Tolerance Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0002507 tolerance induction is the biological process that directly activates any of the steps required for tolerance, a physiologic state in which the immune system does not react destructively against the components of an organism that harbors it or against antigens that are introduced to it.
• Tolerance induction is central to preventing autoimmunity, enabling organ transplantation, and controlling immune responses to therapeutic proteins and biologics.
• Multiple cell types contribute to tolerance induction, including myeloid-derived suppressor cells, dendritic cells, neutrophils, and regulatory T cells.
• Antigen-processing independent T cell epitopes and plant cell-made protein antigens represent novel strategies for oral and systemic tolerance induction.
• Cationic nanoparticles and other engineered platforms are being developed for in vivo immune tolerance induction.
• Dysregulated tolerance induction underlies hemophilia A inhibitor development, liver inflammation, and allergic contact dermatitis.
Description
Tolerance induction (GO:0002507) is a fundamental biological process that directly activates any of the steps required for tolerance, a physiologic state in which the immune system does not react destructively against the components of an organism that harbors it or against antigens that are introduced to it. This process is essential for maintaining immune homeostasis and preventing autoimmunity, while also enabling the acceptance of transplanted organs and therapeutic proteins. Research into tolerance induction has broad implications for transplantation, autoimmunity, allergy, and biologics development. The QuickGO definition emphasizes that tolerance induction encompasses the active steps that lead to a state of non-responsiveness, distinguishing it from passive mechanisms of immune ignorance or suppression. Understanding the cellular and molecular players involved in tolerance induction is critical for developing targeted therapies that can either promote tolerance in autoimmune settings or overcome it in cancer immunotherapy.
tolerance induction At A Glance
| GO ID | GO:0002507 |
|---|---|
| GO term | tolerance induction |
| Ontology | biological_process |
| Synonym | None |
| Major function | Activation of steps required for immune tolerance to self or introduced antigens |
| Related processes | Immune tolerance, transplantation tolerance, oral tolerance, allergen tolerance |
| Key cell types | Myeloid-derived suppressor cells, dendritic cells, neutrophils, regulatory T cells |
| Therapeutic relevance | Transplantation, hemophilia A, allergy, therapeutic protein immunogenicity |
What Is GO:0002507?
Tolerance induction is the biological process that directly activates any of the steps required for tolerance, a physiologic state in which the immune system does not react destructively against the components of an organism that harbors it or against antigens that are introduced to it. In simpler terms, it is the active process by which the immune system learns to tolerate self-antigens or foreign antigens introduced therapeutically, preventing harmful immune responses.
Why Is tolerance induction Important in Cell Biology?
Tolerance induction is critically important because it governs whether the immune system mounts a destructive response against self-tissues, transplanted organs, or therapeutic proteins. Defects in tolerance induction can lead to autoimmune diseases, while the ability to intentionally induce tolerance holds promise for treating hemophilia A patients with inhibitors, preventing organ transplant rejection, and controlling allergic responses. Moreover, understanding tolerance induction mechanisms is essential for designing safer biologics and for developing novel immunotherapies.
• Prevents autoimmunity by maintaining non-responsiveness to self-antigens.
• Enables successful organ transplantation by promoting graft acceptance.
• Reduces immunogenicity of therapeutic proteins, such as factor VIII in hemophilia A.
• Underlies oral tolerance strategies for treating allergies and autoimmune diseases.
• Involves myeloid-derived suppressor cells that expand during inflammation and transplantation.
• Dendritic cells and neutrophils are key regulators of tolerance induction.
• Antigen-processing independent T cell epitopes can induce tolerance to biologics.
• Cationic nanoparticles offer a platform for in vivo tolerance induction.
• Liver inflammation can trigger tolerance induction mechanisms.
• Allergenic chemicals can induce tolerance through specific pathways.
What Happens During tolerance induction?
Antigen Recognition and Processing
In simple terms: The immune system first encounters the antigen and decides whether to react or tolerate.
Tolerance induction begins with antigen recognition by antigen-presenting cells. Depending on the context, antigens can be presented in a tolerogenic manner, leading to T cell anergy or deletion. Antigen-processing independent T cell epitopes can bypass conventional processing to induce tolerance to therapeutic proteins. Plant cell-made protein antigens can be delivered orally to induce tolerance.
Role of Myeloid-Derived Suppressor Cells
In simple terms: Special suppressor cells expand and dampen immune responses.
Myeloid-derived suppressor cells (MDSCs) are potent inducers of tolerance, particularly in transplantation settings. They suppress T cell responses through various mechanisms, including arginase and reactive oxygen species production. MDSCs expand during inflammation and can be harnessed for tolerance induction.
Dendritic Cells and Neutrophils in Tolerance
In simple terms: Dendritic cells and neutrophils help decide whether the immune system tolerates or attacks.
Dendritic cells (DCs) are central to tolerance induction, with tolerogenic DC subsets promoting regulatory T cell expansion. Neutrophils also play a role in shaping DC function and tolerance outcomes. Targeting DCs for tolerance induction requires consideration of neutrophil contributions.
Nanoparticle-Based Tolerance Induction
In simple terms: Tiny particles can deliver antigens to induce tolerance.
Cationic nanoparticles have been developed to deliver antigens and immunomodulators for in vivo tolerance induction. These nanoparticles can target specific cell types and promote regulatory responses. This approach offers a versatile platform for treating autoimmune diseases and transplant rejection.
Tolerance in Hemophilia A and Liver Inflammation
In simple terms: Tolerance induction is used to treat inhibitor development in hemophilia and is influenced by liver inflammation.
Immune tolerance induction (ITI) is a standard treatment for hemophilia A patients who develop inhibitors against factor VIII. Liver inflammation can also trigger tolerance induction mechanisms, as seen in hepatitis models. Allergenic chemicals can induce tolerance through skin exposure.
Key Genes Involved in GO:0002507 tolerance induction
The following genes and proteins are key players in tolerance induction, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FOXP3 | Master regulator of regulatory T cell development and function | Mutations cause IPEX syndrome; target for tolerance induction |
| IL10 | Anti-inflammatory cytokine promoting tolerogenic responses | Enhances MDSC and Treg function |
| TGFB1 | Cytokine that promotes regulatory T cell differentiation | Key mediator of oral tolerance |
| IDO1 | Enzyme that catabolizes tryptophan, suppressing T cell responses | Expressed by tolerogenic DCs |
| ARG1 | Arginase 1 depletes arginine, inhibiting T cell proliferation | Mechanism of MDSC-mediated suppression |
| CD274 | PD-L1, checkpoint ligand that induces T cell exhaustion | Target for tolerance induction in transplantation |
| CTLA4 | Inhibitory receptor on T cells | Competes with CD28 for CD80/86, promoting tolerance |
| HLA-G | Non-classical MHC class I molecule with immunosuppressive properties | Promotes tolerance in transplantation |
| F8 | Coagulation factor VIII | Target of tolerance induction in hemophilia A |
| CD4 | T cell co-receptor | Defines helper T cell subsets involved in tolerance |
| CD25 | IL-2 receptor alpha chain | Marker of regulatory T cells |
| NRP1 | Neuropilin-1, marker of thymic-derived Tregs | Stabilizes Treg function |
| ITGB2 | Integrin beta-2, involved in leukocyte adhesion | May influence MDSC migration |
| S100A8 | Calcium-binding protein secreted by MDSCs | Promotes MDSC accumulation |
| S100A9 | Calcium-binding protein secreted by MDSCs | Promotes MDSC accumulation |
| CCL2 | Chemokine recruiting monocytes and MDSCs | Modulates tolerance induction |
| IL2 | Cytokine essential for Treg survival and function | Low-dose IL-2 therapy for tolerance |
| TNF | Pro-inflammatory cytokine that can break tolerance | Target for anti-TNF therapy in autoimmunity |
How Is tolerance induction Regulated?
Tolerance induction is regulated by a complex network of cytokines, chemokines, and cellular interactions. Myeloid-derived suppressor cells are regulated by inflammatory signals such as IL-6 and GM-CSF, which promote their expansion and suppressive function. Dendritic cells can be modulated by neutrophil-derived factors to adopt a tolerogenic phenotype. In hemophilia A, immune tolerance induction protocols are influenced by factor VIII product type, dosing, and patient genetics. Liver inflammation can shift the balance toward tolerance through mechanisms involving regulatory T cells and cytokines. Nanoparticle-based approaches can be engineered to target specific regulatory pathways.
tolerance induction and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| F8 | Hemophilia A with inhibitors | F8 knockout mouse; ITI protocols |
| FOXP3 | IPEX syndrome, autoimmunity | Foxp3 knockout mouse; Treg depletion |
| IL10 | Inflammatory bowel disease | Il10 knockout mouse; colitis models |
| TGFB1 | Autoimmunity, fibrosis | Tgfb1 knockout mouse; oral tolerance models |
| IDO1 | Transplantation tolerance, cancer | Ido1 knockout mouse; skin graft models |
Hemophilia A and Inhibitor Development
In hemophilia A, approximately 30% of patients develop neutralizing antibodies (inhibitors) against factor VIII, complicating treatment. Immune tolerance induction (ITI) is the primary strategy to eradicate inhibitors, involving repeated exposure to factor VIII to induce tolerance. The success of ITI depends on patient age, inhibitor titer, and treatment regimen.
Transplantation Tolerance
Achieving tolerance to transplanted organs without lifelong immunosuppression is a major goal. Myeloid-derived suppressor cells and regulatory T cells are key mediators of transplantation tolerance. Strategies to expand these cells or infuse them therapeutically are under investigation.
Allergy and Contact Dermatitis
Tolerance induction to allergenic chemicals can prevent contact dermatitis. Studies in animal models have shown that prior exposure to haptens can induce tolerance. Oral tolerance strategies using plant-made antigens are being explored for food allergies.
Autoimmune Diseases and Liver Inflammation
Defective tolerance induction contributes to autoimmune diseases. Liver inflammation can paradoxically promote tolerance through mechanisms that suppress autoreactive T cells. Understanding these pathways may lead to new therapies for autoimmune hepatitis and other conditions.
From tolerance induction-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate MDSC-mediated tolerance? | Gene X knockout mouse with tumor or transplant model |
| Can point mutation in FOXP3 alter Treg function? | FOXP3 point-mutation knock-in mouse |
| Does overexpression of IL-10 enhance oral tolerance? | IL-10 transgenic mouse |
| Can tagged FOXP3 track Tregs in vivo? | FOXP3-GFP knock-in mouse |
| Does nanoparticle-delivered antigen induce tolerance? | Cationic nanoparticle treatment in mouse models |
| Does F8 variant affect inhibitor development? | F8 knock-in mouse with human variant |
How to Study the tolerance induction Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Flow cytometry | Frequency and phenotype of immune cell subsets | Treg, MDSC, DC analysis |
| ELISPOT | Antigen-specific cytokine-secreting cells | Tolerance to factor VIII |
| ELISA | Cytokine concentrations in serum or supernatant | IL-10, TGF-beta measurement |
| Mixed lymphocyte reaction | T cell proliferation in response to alloantigens | Transplantation tolerance |
| Skin graft model | Graft survival time | Tolerance induction in vivo |
| Nanoparticle tracking | Biodistribution and cellular uptake | Nanoparticle-based tolerance |
| Oral tolerance model | Suppression of immune response to fed antigen | Plant-made antigen tolerance |
| Contact hypersensitivity | Ear swelling response to hapten | Chemical-induced tolerance |
Flow Cytometry and Immunophenotyping
Flow cytometry is used to identify and quantify regulatory T cells, myeloid-derived suppressor cells, and dendritic cell subsets in tolerance induction studies. Markers such as CD4, CD25, FOXP3, and CD11b are commonly analyzed.
Cytokine Profiling and ELISPOT
Cytokine secretion profiles, including IL-10, TGF-beta, and IFN-gamma, are measured by ELISA or ELISPOT to assess tolerogenic versus inflammatory responses. These assays help determine the functional outcome of tolerance induction.
Transplantation and Autoimmunity Models
Animal models of skin, heart, or islet transplantation are used to test tolerance induction strategies. Experimental autoimmune encephalomyelitis (EAE) and colitis models assess tolerance in autoimmunity.
Nanoparticle Characterization and Delivery
Cationic nanoparticles are characterized for size, charge, and antigen loading. Their ability to induce tolerance is tested in vivo using antigen-specific T cell proliferation assays.
How CRISPR Can Be Used to Study GO:0002507 tolerance induction
Knockout
CRISPR knockout of genes such as FOXP3, IL10, or IDO1 in mice or cell lines can reveal their essential roles in tolerance induction. For example, FOXP3 knockout mice develop fatal autoimmunity, demonstrating the gene's non-redundant function in tolerance.
Point Mutation
Introducing point mutations in genes like FOXP3 or F8 can model human disease variants and test their impact on tolerance induction. For instance, a point mutation in the FOXP3 forkhead domain can abrogate Treg function.
Knock-in
Knock-in of reporter genes (e.g., GFP) or human disease alleles allows tracking of tolerance-inducing cells and testing of therapeutic strategies. FOXP3-GFP knock-in mice are widely used to isolate Tregs.
Overexpression
Overexpression of tolerogenic factors such as IL-10 or TGF-beta can enhance tolerance induction in vivo. Transgenic mice overexpressing these cytokines show suppressed immune responses and resistance to autoimmunity.
How EDITGENE Supports tolerance induction Research
Researchers studying tolerance induction-related genes often need to determine whether a candidate gene is causally involved in immune tolerance or merely a bystander. CRISPR-based models provide a rigorous approach to establish causality and to test therapeutic hypotheses.
Contact EDITGENE today to design your custom CRISPR model for tolerance induction research.
Frequently Asked Questions About tolerance induction
What is tolerance induction?
Tolerance induction is the biological process that activates steps required for immune tolerance, a state in which the immune system does not react destructively against self or introduced antigens.
What genes are involved in tolerance induction?
Key genes include FOXP3, IL10, TGFB1, IDO1, ARG1, and F8, among others.
How is tolerance induction studied?
It is studied using flow cytometry, cytokine assays, transplantation models, and CRISPR-based gene editing.
What is immune tolerance induction in hemophilia A?
It is a treatment strategy to eradicate factor VIII inhibitors by repeated exposure to factor VIII, aiming to induce tolerance.
Can nanoparticles induce immune tolerance?
Yes, cationic nanoparticles can deliver antigens and immunomodulators to induce tolerance in vivo.
What is the role of myeloid-derived suppressor cells in tolerance?
MDSCs suppress T cell responses and promote tolerance, particularly in transplantation and cancer.
How do dendritic cells contribute to tolerance induction?
Tolerogenic dendritic cells promote regulatory T cell expansion and suppress effector T cell responses.
What is oral tolerance?
Oral tolerance is the suppression of immune responses to antigens administered orally, often used for food allergies.
Can tolerance be induced to therapeutic proteins?
Yes, strategies such as antigen-processing independent T cell epitopes can induce tolerance to biologics.
What diseases are linked to defective tolerance induction?
Autoimmune diseases, hemophilia A with inhibitors, allergies, and transplant rejection are linked to defective tolerance.
Conclusion
Tolerance induction (GO:0002507) is a vital biological process with broad implications for human health. From preventing autoimmunity to enabling transplantation and improving biologics, understanding its mechanisms is essential. CRISPR-based models and EDITGENE services can accelerate research in this field, helping to uncover new therapeutic targets and strategies.
References
- 1. Cao P et al.. 2020. Myeloid-derived suppressor cells in transplantation tolerance induction.. Int Immunopharmacol 83:106421 PMID: 32217462
- 2. Schurgers E et al.. 2021. Induction of Tolerance to Therapeutic Proteins With Antigen-Processing Independent T Cell Epitopes: Controlling Immune Responses to Biologics.. Front Immunol 12:742695 PMID: 34567009
- 3. Daniell H et al.. 2019. Plant cell-made protein antigens for induction of Oral tolerance.. Biotechnol Adv 37(7):107413 PMID: 31251968
- 4. Mao K et al.. 2024. Cationic nanoparticles-based approaches for immune tolerance induction in vivo.. J Control Release 366:425-447 PMID: 38154540
- 5. Schep SJ et al.. 2018. Review of immune tolerance induction in hemophilia A.. Blood Rev 32(4):326-338 PMID: 29482894
- 6. Erhardt A et al.. 2010. Tolerance induction in response to liver inflammation.. Dig Dis 28(1):86-92 PMID: 20460895
- 7. Chase MW. 1982. The induction of tolerance to allergenic chemicals.. Ann N Y Acad Sci 392:228-47 PMID: 6215880
- 8. Hafkamp FMJ et al.. 2021. Targeting DCs for Tolerance Induction: Don't Lose Sight of the Neutrophils.. Front Immunol 12:732992 PMID: 34675923
