U937 Cell Line Profile
Quick Facts
| Feature | Information |
|---|---|
| Cell Line | U937 |
| Species | Human (Homo sapiens) |
| Tissue of Origin | Histiocytic Lymphoma |
| Disease Association | Histiocytic Lymphoma / Monocytic Leukemia-like Model |
| Cell Type | Monocyte-like |
| Growth Mode | Suspension |
| Morphology | Round, monocyte-like |
| Recommended Medium | RPMI-1640 + 10% FBS |
| Incubation Conditions | 37°C, 5% CO₂, ≥95% humidity |
| Typical Doubling Time | Approximately 24-36 hours |
| Major Applications | Monocyte Biology, Macrophage Differentiation, Infection Biology, Leukemia Research |
Overview
U937 is a human monocyte-like suspension cell line widely used in immunology and infection research. Derived from a patient with histiocytic lymphoma, it serves as a versatile model for studying innate immune responses, monocyte differentiation, and host-pathogen interactions. Like THP-1 cells, U937 cells can be differentiated into macrophage-like cells, making them valuable for investigating immune cell function under both resting and activated conditions.
Origin and History
- Established in 1974 from the pleural effusion of a patient with diffuse histiocytic lymphoma.
- One of the earliest continuously growing human monocyte-like cell lines.
- Extensively used in studies of inflammation, infection, leukemia biology, and macrophage differentiation.
Growth Characteristics
| Characteristic | Description |
|---|---|
| Growth Mode | Suspension |
| Morphology | Round, monocyte-like |
| Growth Pattern | Single cells or loose aggregates |
| Doubling Time | Approximately 24-36 hours |
Culture Notes
U937 cells grow in suspension and are maintained by dilution rather than enzymatic passaging. Maintaining appropriate cell density is essential, as overcrowding can reduce viability and alter immune responses.
Biological Characteristics
Monocyte-to-Macrophage Differentiation
U937 cells readily differentiate into macrophage-like cells following stimulation with agents such as Phorbol 12-Myristate 13-Acetate (PMA) or Vitamin D3.
Following differentiation, cells typically:
- Become adherent
- Increase in size
- Develop macrophage-like morphology
- Show enhanced phagocytosis
- Display increased expression of macrophage-associated genes
Innate Immune Responses
U937 cells express multiple innate immune receptors, including Toll-like receptors (TLRs), enabling studies of microbial recognition, cytokine production, and inflammatory signaling.
Host-Pathogen Interactions
Because many intracellular pathogens naturally infect monocytes and macrophages, U937 cells are widely used to investigate:
- Bacterial infections
- Viral infections
- Intracellular pathogen survival
- Immune evasion mechanisms
Cytokine Signaling
Activated U937 cells produce inflammatory mediators including:
- TNF-α
- IL-1β
- IL-6
- IL-8
making them useful for studies of inflammation and immune regulation.
Culture Conditions
Recommended Medium
- RPMI-1640
- 10% Fetal Bovine Serum (FBS)
Incubation Conditions
| Parameter | Value |
|---|---|
| Temperature | 37°C |
| CO₂ | 5% |
| Relative Humidity | ≥95% |
Passaging
Maintain cultures within the recommended density range by regular dilution. Differentiated cells become adherent and should be handled accordingly during downstream assays.
Major Applications
U937 cells are widely used for:
- Monocyte biology
- Macrophage differentiation
- Innate immune signaling
- Host-pathogen interactions
- Cytokine biology
- Leukemia research
- Drug discovery
- Oxidative burst and antimicrobial response studies
Advantages
- Human-derived immune cell model
- Readily differentiates into macrophage-like cells
- Easy suspension culture and expansion
- Broad applicability in immunology and infection biology
- Extensive experimental literature
Limitations
- Derived from a malignant lymphoma rather than normal monocytes
- Differentiated cells do not fully mimic primary tissue macrophages
- Simplified immune environment lacking interactions with other immune and stromal cells
- Differentiation protocols may produce variable phenotypes
Authentication and Quality Control
Cell Line Authentication
Routine authentication using Short Tandem Repeat (STR) profiling is recommended to confirm cell identity and detect cross-contamination.
Contamination Monitoring
Regular screening should include:
- Mycoplasma contamination
- Bacterial contamination
- Fungal contamination
Routine quality control is essential for reliable and reproducible experimental results.
Cryopreservation
U937 cells recover well following standard cryopreservation and thawing procedures. Maintaining low-passage master stocks is recommended for long-term experimental consistency.
Related Topics
- THP-1
- Jurkat
- Macrophage Differentiation
- Cytokine Biology
- Innate Immunity
- Host-Pathogen Interactions
- Leukemia Biology
- Inflammation
References
- Freshney RI. Culture of Animal Cells: A Manual of Basic Technique and Specialized Applications.
- ATCC Cell Line Database.
- Cellosaurus Cell Line Knowledgebase.
- ECACC Cell Line Collection.