N-2 Supplement
Quick Facts
| Feature | Information |
|---|---|
| Supplement Type | Chemically defined, serum-free supplement |
| Primary Use | Neural stem cell and neural progenitor cell culture |
| Typical Working Concentration | 1× (from a 100× stock) |
| Common Basal Media | DMEM/F-12, Neurobasal, KnockOut DMEM |
| Storage | −20°C (avoid repeated freeze-thaw cycles) |
Overview
N-2 Supplement is a chemically defined, serum-free supplement designed to support the survival, proliferation, and controlled differentiation of neural stem cells (NSCs), neural progenitor cells (NPCs), and other neural precursor populations. It was one of the first defined serum replacements for neural cell culture and remains the standard supplement for neural induction and early neural development protocols.
Unlike B-27 Supplement, which is optimized for mature neurons, N-2 is primarily used during the expansion and maintenance of neural precursor cells.
Biological Role
N-2 Supplement supports neural cultures by:
- Maintaining neural stem cell populations
- Promoting neural progenitor expansion
- Supporting neurosphere formation
- Facilitating neural induction
- Reducing variability associated with serum
- Enabling controlled neural differentiation
Major Components
| Component | Function |
|---|---|
| Insulin | Glucose uptake and cellular metabolism |
| Transferrin | Iron transport |
| Selenium | Antioxidant enzyme cofactor |
| Progesterone | Neural cell survival |
| Putrescine | Cell proliferation and differentiation |
Typical Applications
N-2 Supplement is widely used for:
- Neural stem cells (NSCs)
- Neural progenitor cells (NPCs)
- Neurospheres
- Early iPSC neural differentiation
- Neural induction protocols
- Brain organoids
- Cortical organoids
- Spinal cord organoids
- Developmental neuroscience
- CNS disease modeling
Recommended Use
| Parameter | Recommendation |
|---|---|
| Stock Concentration | 100× |
| Working Concentration | 1× |
| Typical Dilution | 1:100 into complete medium |
Always prepare complete medium according to the manufacturer's recommendations.
Common Basal Media
| Basal Medium | Typical Application |
|---|---|
| DMEM/F-12 | Neural stem cell expansion |
| Neurobasal | Selected neural differentiation protocols |
| KnockOut DMEM | Early neural differentiation |
| IMDM | Selected neural applications |
Advantages
- Chemically defined formulation
- Serum-free
- Excellent for NSC and NPC culture
- Supports reproducible neural differentiation
- Minimizes experimental variability
- Well established in developmental neuroscience
Limitations
- Not optimized for mature neuronal maintenance
- Requires a suitable basal medium
- Does not replace neurotrophic growth factors
- Commonly used together with EGF and FGF2 for stem cell expansion
Comparison with Related Supplements
| Supplement | Primary Use |
|---|---|
| N-2 Supplement | Neural induction, NSC and NPC maintenance |
| B-27 Supplement | Neuronal maturation and long-term maintenance |
| B-27 Plus Supplement | Enhanced neuronal survival and reproducibility |
Typical Workflow
Neural Induction → N-2 Supplement
↓
Neuronal Maturation → B-27 Supplement
References
- Bottenstein JE, Sato GH. Growth of a rat neuroblastoma cell line in serum-free supplemented medium. PNAS (1979).
- Gibco™ N-2 Supplement Product Information.
- Brewer GJ et al. Optimized survival of hippocampal neurons in B27-supplemented Neurobasal medium. Journal of Neuroscience Research (1993).
- Freshney RI. Culture of Animal Cells: A Manual of Basic Technique and Specialized Applications.