Macrophage Colony-Stimulating Factor (M-CSF)
Quick Facts
| Feature | Information |
|---|---|
| Full Name | Macrophage Colony-Stimulating Factor |
| Abbreviation | M-CSF |
| Alternative Name | CSF1 |
| Molecule Type | Recombinant Cytokine |
| Family | Colony-Stimulating Factor Family |
| Molecular Weight | ~36-40 kDa (homodimer, glycosylation dependent) |
| Primary Receptor | CSF1 Receptor (CSF1R, CD115) |
| Typical Working Concentration | 10-100 ng/mL |
| Common Stock Concentration | 10-100 μg/mL |
Overview
Macrophage Colony-Stimulating Factor (M-CSF), also known as Colony-Stimulating Factor 1 (CSF1), is a hematopoietic cytokine that regulates the survival, proliferation, differentiation, and function of monocytes, macrophages, osteoclasts, and tissue-resident macrophages.
Unlike GM-CSF, which broadly promotes myeloid differentiation and inflammatory activation, M-CSF primarily supports macrophage lineage commitment and homeostatic macrophage functions.
M-CSF is widely used in macrophage differentiation protocols, bone marrow cultures, osteoclast generation, immunology research, and stem cell differentiation.
Biological Function
M-CSF regulates multiple aspects of macrophage biology, including:
- Promotes monocyte survival
- Drives macrophage differentiation
- Supports macrophage proliferation
- Maintains tissue-resident macrophages
- Regulates osteoclast development
- Enhances phagocytic activity
- Supports innate immune homeostasis
Mechanism of Action
M-CSF binds to the CSF1 receptor (CSF1R/CD115) expressed on monocytes, macrophages, and myeloid progenitors.
Ligand binding induces receptor dimerization and activation of intracellular signaling pathways, including:
- PI3K-AKT pathway
- MAPK/ERK pathway
- JAK-STAT pathway
- Src family kinase pathways
These pathways regulate cell survival, proliferation, differentiation, and macrophage-specific gene expression.
Common Applications
M-CSF is widely used for:
- Macrophage differentiation
- Monocyte culture
- Bone marrow-derived macrophage (BMDM) generation
- Osteoclast differentiation
- Hematopoietic stem cell research
- Innate immunity studies
- Inflammation research
- Tissue macrophage biology
Cell Types Commonly Supplemented with M-CSF
| Cell Type | Typical Application |
|---|---|
| Bone Marrow Cells | Macrophage differentiation |
| Monocytes | Macrophage generation |
| CD34⁺ Cells | Myeloid differentiation |
| Hematopoietic Stem Cells | Myeloid lineage studies |
| Bone Marrow-Derived Macrophages (BMDMs) | Routine culture |
| Osteoclast Precursors | Osteoclast differentiation |
| Human iPSCs | Macrophage differentiation |
| Human ESCs | Hematopoietic differentiation |
M-CSF is commonly combined with additional cytokines depending on the target lineage and experimental protocol.
Typical Working Concentrations
| Application | Typical Concentration |
|---|---|
| Macrophage Differentiation | 25-100 ng/mL |
| Bone Marrow-Derived Macrophages | 20-50 ng/mL |
| Osteoclast Differentiation* | 25-50 ng/mL |
| Hematopoietic Stem Cell Culture | 10-50 ng/mL |
*Osteoclast differentiation typically requires M-CSF together with RANKL.
Advantages
- Essential cytokine for macrophage differentiation
- Supports long-term macrophage survival
- Produces highly reproducible macrophage cultures
- Well-characterized signaling pathways
- Compatible with serum-free and defined media
- Widely used in immunology and inflammation research
Limitations
- Activity depends on CSF1R expression
- Does not efficiently generate dendritic cells
- Sensitive to repeated freeze-thaw cycles
- Often requires additional cytokines for specialized differentiation
- Macrophage phenotype varies depending on culture conditions
Related Cytokines
Frequently combined with:
- Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF)
- Receptor Activator of Nuclear Factor-κB Ligand (RANKL)
- Interleukin-4 (IL-4)
- Interferon-γ (IFN-γ)
- Interleukin-13 (IL-13)
- Lipopolysaccharide (LPS)
- Stem Cell Factor (SCF)
See Also
- Growth Factor Handling and Storage Guide
- Bone Marrow-Derived Macrophage Culture
- Monocyte Isolation
- Osteoclast Differentiation
- Hematopoietic Stem Cell Culture
- Macrophage Polarization
Key Takeaways
- M-CSF (CSF1) is the principal cytokine regulating macrophage survival, proliferation, and differentiation.
- It signals through the CSF1 receptor (CSF1R/CD115) to activate PI3K-AKT, MAPK/ERK, JAK-STAT, and Src signaling pathways.
- M-CSF is widely used for macrophage differentiation, bone marrow-derived macrophage culture, osteoclast generation, and innate immunity research.
- It is commonly combined with RANKL, IL-4, IFN-γ, IL-13, and GM-CSF depending on the desired macrophage phenotype or downstream application.
- Typical working concentrations range from 10-100 ng/mL, with 25-50 ng/mL commonly used for macrophage differentiation.
References
- Stanley ER, Chitu V. Cold Spring Harbor Perspectives in Biology (2014).
- Pixley FJ, Stanley ER. Trends in Cell Biology (2004).
- Freshney RI. Culture of Animal Cells: A Manual of Basic Technique and Specialized Applications.
- Thermo Fisher Scientific. Recombinant Human M-CSF Product Information.
- PeproTech. Recombinant Human M-CSF Product Datasheet.