Interleukin-6 (IL-6)
Quick Facts
| Feature | Information |
|---|---|
| Full Name | Interleukin-6 |
| Abbreviation | IL-6 |
| Molecule Type | Recombinant Cytokine |
| Family | IL-6 Cytokine Family |
| Molecular Weight | ~21-28 kDa (glycosylation dependent) |
| Primary Receptor | IL-6 Receptor (IL-6R/CD126) and gp130 (CD130) |
| Typical Working Concentration | 1-100 ng/mL |
| Common Stock Concentration | 10-100 μg/mL |
Overview
Interleukin-6 (IL-6) is a pleiotropic cytokine involved in immune regulation, inflammation, hematopoiesis, and tissue regeneration. It influences the survival, proliferation, and differentiation of numerous cell types and is widely used in mammalian cell culture, particularly for hematopoietic, immune, hybridoma, and stem cell applications.
In vitro, IL-6 is commonly incorporated into cytokine cocktails for hematopoietic stem cell expansion, B-cell differentiation, hybridoma generation, and maintenance of selected pluripotent stem cell cultures.
Biological Function
IL-6 regulates numerous biological processes, including:
- Promotes cell survival
- Supports hematopoietic stem and progenitor cells
- Stimulates B-cell maturation
- Enhances plasma cell differentiation
- Regulates immune responses
- Supports tissue regeneration
- Modulates inflammatory signaling
Mechanism of Action
IL-6 binds to the IL-6 receptor (IL-6R/CD126), which associates with the signal-transducing receptor gp130 (CD130).
Activation of the receptor complex stimulates multiple intracellular signaling pathways, including:
- JAK-STAT3 pathway
- PI3K-AKT pathway
- MAPK/ERK pathway
These pathways regulate cell proliferation, differentiation, survival, and inflammatory responses.
Common Applications
IL-6 is widely used for:
- Hematopoietic stem cell culture
- CD34⁺ cell expansion
- Hybridoma culture
- B-cell differentiation
- Plasma cell generation
- Stem cell differentiation
- Immunology research
- Cytokine signaling studies
Cell Types Commonly Supplemented with IL-6
| Cell Type | Typical Application |
|---|---|
| Hematopoietic Stem Cells (HSCs) | Expansion and maintenance |
| CD34⁺ Cells | Ex vivo expansion |
| B Lymphocytes | Differentiation |
| Plasma Cells | Maturation |
| Hybridomas | Survival and antibody production |
| Bone Marrow Cells | Hematopoietic studies |
| Human iPSCs | Hematopoietic differentiation |
| Human ESCs | Selected differentiation protocols |
IL-6 is generally used as part of a cytokine cocktail rather than as a single supplement.
Typical Working Concentrations
| Application | Typical Concentration |
|---|---|
| Hematopoietic Stem Cell Culture | 10-50 ng/mL |
| CD34⁺ Cell Expansion | 10-50 ng/mL |
| Hybridoma Culture | 5-20 ng/mL |
| B-Cell Differentiation | 10-100 ng/mL |
Advantages
- Supports hematopoietic stem and progenitor cells
- Enhances hybridoma growth and antibody production
- Promotes B-cell maturation
- Widely used in immunology research
- Well-characterized cytokine signaling pathway
- Compatible with serum-free hematopoietic media
Limitations
- Activity depends on IL-6 receptor expression
- Broad biological activity may influence multiple cell populations
- Rarely used alone in culture
- Sensitive to repeated freeze-thaw cycles
- High concentrations may alter differentiation outcomes
Related Cytokines
Frequently combined with:
- Stem Cell Factor (SCF)
- Thrombopoietin (TPO)
- Interleukin-3 (IL-3)
- Fms-like Tyrosine Kinase 3 Ligand (FLT3L)
- Granulocyte Colony-Stimulating Factor (G-CSF)
- Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF)
- Interleukin-11 (IL-11)
See Also
- Growth Factor Handling and Storage Guide
- Hematopoietic Stem Cell Culture
- CD34⁺ Cell Expansion
- Hybridoma Culture
- B-Cell Culture
- IL-6 Signaling
Key Takeaways
- IL-6 is a multifunctional cytokine involved in immune regulation, hematopoiesis, and tissue repair.
- It signals through the IL-6R/gp130 receptor complex, activating JAK-STAT3, PI3K-AKT, and MAPK/ERK signaling pathways.
- IL-6 is widely used for hematopoietic stem cell culture, hybridoma maintenance, B-cell differentiation, and immune cell research.
- It is commonly combined with SCF, TPO, IL-3, and FLT3L in hematopoietic expansion protocols.
- Typical working concentrations range from 1-100 ng/mL, depending on the application.
References
- Kishimoto T. Cell (2005).
- Rose-John S. International Journal of Biological Sciences (2012).
- Freshney RI. Culture of Animal Cells: A Manual of Basic Technique and Specialized Applications.
- Thermo Fisher Scientific. Recombinant Human IL-6 Product Information.
- PeproTech. Recombinant Human IL-6 Product Datasheet.