Interleukin-3 (IL-3)
Quick Facts
| Feature | Information |
|---|---|
| Full Name | Interleukin-3 |
| Abbreviation | IL-3 |
| Molecule Type | Recombinant Cytokine |
| Family | Hematopoietic Cytokine Family |
| Molecular Weight | ~15-18 kDa (glycosylation dependent) |
| Primary Receptor | IL-3 Receptor (CD123/IL-3Rα + βc/CD131) |
| Typical Working Concentration | 1-20 ng/mL |
| Common Stock Concentration | 10-100 μg/mL |
Overview
Interleukin-3 (IL-3) is a pleiotropic hematopoietic cytokine that supports the survival, proliferation, and differentiation of multipotent hematopoietic progenitor cells. Unlike lineage-specific cytokines, IL-3 acts on a broad range of early blood cell precursors, making it an important component of hematopoietic stem cell culture and immune cell differentiation protocols.
IL-3 is widely used in hematopoietic stem cell research, dendritic cell generation, mast cell culture, myeloid differentiation, and cytokine-based expansion systems.
Biological Function
IL-3 regulates several biological processes, including:
- Promotes hematopoietic progenitor cell survival
- Stimulates proliferation of early blood cell precursors
- Supports myeloid lineage differentiation
- Enhances mast cell growth
- Promotes basophil development
- Supports dendritic cell generation
- Reduces apoptosis of hematopoietic cells
Mechanism of Action
IL-3 binds to the IL-3 receptor, composed of:
- IL-3Rα (CD123)
- Common β chain (βc/CD131)
Receptor activation induces intracellular signaling through:
- JAK2-STAT5 pathway
- PI3K-AKT pathway
- MAPK/ERK pathway
These signaling pathways regulate cell survival, proliferation, differentiation, and hematopoietic lineage commitment.
Common Applications
IL-3 is widely used for:
- Hematopoietic stem cell culture
- Myeloid progenitor expansion
- Dendritic cell differentiation
- Mast cell culture
- Basophil differentiation
- Bone marrow cell culture
- Hematopoietic differentiation of pluripotent stem cells
- Leukemia research
Cell Types Commonly Supplemented with IL-3
| Cell Type | Typical Application |
|---|---|
| Hematopoietic Stem Cells (HSCs) | Expansion and survival |
| CD34⁺ Cells | Progenitor expansion |
| Myeloid Progenitor Cells | Differentiation |
| Bone Marrow Cells | Hematopoietic culture |
| Dendritic Cell Precursors | Differentiation |
| Mast Cells | Growth and maturation |
| Basophil Precursors | Differentiation |
| Human iPSCs | Hematopoietic differentiation |
IL-3 is generally used in combination with other cytokines rather than as a standalone supplement.
Typical Working Concentrations
| Application | Typical Concentration |
|---|---|
| Hematopoietic Stem Cell Culture | 5-20 ng/mL |
| CD34⁺ Cell Expansion | 10-20 ng/mL |
| Dendritic Cell Differentiation | 5-10 ng/mL |
| Mast Cell Culture | 10-20 ng/mL |
Advantages
- Supports multiple hematopoietic lineages
- Promotes progenitor cell survival
- Enhances expansion of early hematopoietic cells
- Widely used in hematopoietic differentiation protocols
- Well-characterized cytokine signaling
- Compatible with serum-free hematopoietic media
Limitations
- Activity depends on IL-3 receptor expression
- Limited effects on mature blood cells
- Rarely used as a single cytokine
- Sensitive to repeated freeze-thaw cycles
- May alter lineage commitment depending on cytokine combinations
Related Cytokines
Frequently combined with:
- Stem Cell Factor (SCF)
- Thrombopoietin (TPO)
- Fms-like Tyrosine Kinase 3 Ligand (FLT3L)
- Interleukin-6 (IL-6)
- Granulocyte Colony-Stimulating Factor (G-CSF)
- Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF)
- Erythropoietin (EPO)
See Also
- Growth Factor Handling and Storage Guide
- Hematopoietic Stem Cell Culture
- CD34⁺ Cell Expansion
- Bone Marrow Cell Culture
- Dendritic Cell Differentiation
- IL-3 Signaling
Key Takeaways
- IL-3 is a multipotent hematopoietic cytokine that promotes survival and proliferation of early blood cell progenitors.
- It signals through the IL-3 receptor (CD123/CD131), activating JAK2-STAT5, PI3K-AKT, and MAPK/ERK pathways.
- IL-3 is widely used for hematopoietic stem cell culture, myeloid differentiation, dendritic cell generation, and mast cell culture.
- It is commonly combined with SCF, TPO, FLT3L, and IL-6 in hematopoietic expansion media.
- Typical working concentrations range from 1-20 ng/mL, depending on the application.
References
- Metcalf D. Blood (2008).
- Dexter TM, Spooncer E. Annual Review of Cell Biology (1987).
- Freshney RI. Culture of Animal Cells: A Manual of Basic Technique and Specialized Applications.
- Thermo Fisher Scientific. Recombinant Human IL-3 Product Information.
- PeproTech. Recombinant Human IL-3 Product Datasheet.