CHO Cell Line
Repository ID: CL-HAM-001
Quick Facts
| Parameter | Information |
|---|---|
| Cell Line | CHO |
| Full Name | Chinese Hamster Ovary |
| Species | Chinese Hamster (Cricetulus griseus) |
| Tissue of Origin | Ovary |
| Cell Type | Epithelial-like |
| Growth Mode | Adherent or Suspension (variant dependent) |
| Morphology | Polygonal to elongated epithelial-like cells |
| Typical Medium | Ham's F-12, DMEM/F12, or serum-free production media |
| Doubling Time | 14-24 hours |
| Main Use | Recombinant protein and monoclonal antibody production |
Overview
Chinese Hamster Ovary (CHO) cells are the most widely used mammalian expression system in biotechnology and biopharmaceutical manufacturing. Unlike HEK293 or HeLa cells, which are primarily research models, CHO cells are optimized for producing therapeutic proteins at industrial scale.
Their ability to grow efficiently, adapt to suspension culture, and generate complex post-translational modifications has made them the preferred host for manufacturing many approved biologic medicines.
Origin
- Established in the late 1950s from the ovary of the Chinese hamster (Cricetulus griseus).
- Originally developed as a mammalian cell culture model.
- Adopted for recombinant protein production following the development of recombinant DNA technology.
Unique Biology
CHO cells are capable of producing recombinant proteins with many of the post-translational modifications required for therapeutic activity, including glycosylation, proper protein folding, and disulfide bond formation.
Unlike bacterial expression systems, CHO cells can generate proteins that closely resemble those produced in human cells, making them well suited for manufacturing therapeutic antibodies, hormones, enzymes, and other biologics.
Numerous engineered CHO derivatives have been developed to improve protein yield, clone stability, and large-scale manufacturing performance.
Culture Considerations
CHO cells are available as both adherent and suspension-adapted variants.
Typical culture conditions include:
- Ham's F-12 or DMEM/F12 medium
- Serum-containing or chemically defined serum-free formulations
- 37°C
- 5% CO₂
Industrial production commonly uses suspension-adapted CHO cells grown in chemically defined media within bioreactors, whereas research laboratories often maintain adherent variants.
Major Applications
CHO cells are extensively used for:
- Recombinant protein production
- Monoclonal antibody manufacturing
- Stable transfection
- Cell line engineering
- Protein engineering
- Bioprocess development
- Toxicology
- Industrial biotechnology
Common Variants
| Variant | Primary Application |
|---|---|
| CHO-K1 | General research and gene expression |
| CHO-S | Suspension culture and protein production |
| CHO-DG44 | Stable recombinant protein expression |
| CHO-DXB11 | Industrial biopharmaceutical manufacturing |
| ExpiCHO | High-yield transient protein expression |
Strengths
- Industry-standard mammalian expression platform
- Human-compatible post-translational modifications
- Adaptable to suspension culture
- Scalable for industrial manufacturing
- Extensive regulatory acceptance
- High recombinant protein productivity
Limitations
- Non-human origin may result in glycosylation patterns that differ slightly from those of human proteins.
- Production characteristics vary among clones.
- Long-term culture may result in genetic drift.
- More demanding culture requirements than bacterial expression systems.
References
- Puck TT, Cieciura SJ, Robinson A. Genetics of Somatic Mammalian Cells. Journal of Experimental Medicine.
- Kim JY, Kim YG, Lee GM. CHO Cells in Biotechnology for Production of Recombinant Proteins. Applied Microbiology and Biotechnology.
- Jayapal KP, Wlaschin KF, Hu WS, Yap MG. Recombinant Protein Therapeutics from CHO Cells. Chemical Engineering Progress.
- Freshney RI. Culture of Animal Cells: A Manual of Basic Technique and Specialized Applications.
- ATCC Cell Line Database.
- Cellosaurus Cell Line Knowledge Resource.
- ECACC Cell Line Collection.