Brain-Derived Neurotrophic Factor (BDNF)
Quick Facts
| Feature | Information |
|---|---|
| Full Name | Brain-Derived Neurotrophic Factor |
| Abbreviation | BDNF |
| Molecule Type | Recombinant Neurotrophic Growth Factor |
| Family | Neurotrophin Family |
| Molecular Weight | ~27 kDa (Mature Homodimer) |
| Primary Receptors | TrkB, p75NTR |
| Typical Working Concentration | 10-100 ng/mL |
| Common Stock Concentration | 50-100 μg/mL |
Overview
Brain-Derived Neurotrophic Factor (BDNF) is a key member of the neurotrophin family that regulates neuronal survival, maturation, and synaptic function. It is highly expressed in the central nervous system and plays essential roles in neuronal development, synaptic plasticity, learning, and memory.
In cell culture, BDNF is widely used to support the maturation and long-term survival of primary neurons, induced pluripotent stem cell (iPSC)-derived neurons, neural stem cell-derived neurons, and brain organoids.
Biological Function
BDNF regulates multiple aspects of nervous system development and function, including:
- Promotes neuronal survival
- Supports neuronal maturation
- Stimulates dendritic growth
- Enhances synapse formation
- Regulates synaptic plasticity
- Supports learning and memory
- Protects neurons from apoptosis
Mechanism of Action
BDNF primarily binds two receptors:
- TrkB (Tropomyosin Receptor Kinase B), the high-affinity receptor
- p75 Neurotrophin Receptor (p75NTR), the low-affinity receptor
Activation of TrkB initiates receptor dimerization and autophosphorylation, leading to activation of downstream signaling pathways, including:
- MAPK/ERK pathway
- PI3K-AKT pathway
- PLCγ pathway
These pathways regulate neuronal survival, dendritic growth, synapse formation, protein synthesis, and neuronal plasticity.
Mature BDNF vs proBDNF
BDNF is synthesized as a precursor protein (proBDNF) that is subsequently cleaved to form mature BDNF.
| Form | Primary Function |
|---|---|
| Mature BDNF | Neuronal survival, neurite growth, synaptic plasticity |
| proBDNF | Synaptic pruning, apoptosis, neuronal remodeling |
The balance between proBDNF and mature BDNF contributes to normal nervous system development and function.
Common Applications
BDNF is widely used for:
- Primary neuron culture
- Neuronal maturation
- Neural stem cell differentiation
- iPSC-derived neuron differentiation
- Brain and spinal cord organoids
- Synaptic plasticity studies
- Neurodegeneration research
- Neuroprotection assays
Cell Types Commonly Supplemented with BDNF
| Cell Type | Typical Application |
|---|---|
| Primary Cortical Neurons | Long-term maintenance |
| Hippocampal Neurons | Synaptic plasticity studies |
| Dopaminergic Neurons | Neuronal survival |
| Motor Neurons | Maturation and maintenance |
| Neural Stem Cell-Derived Neurons | Differentiation |
| iPSC-Derived Neurons | Functional maturation |
| Brain Organoids | Neuronal development |
BDNF supplementation should be optimized according to the neuronal subtype and differentiation protocol.
Typical Working Concentrations
| Application | Typical Concentration |
|---|---|
| Primary Neurons | 10-50 ng/mL |
| Neural Stem Cell Differentiation | 20-50 ng/mL |
| iPSC-Derived Neurons | 10-50 ng/mL |
| Brain Organoids | 20-100 ng/mL |
Advantages
- Supports long-term neuronal survival
- Promotes dendritic growth and synapse formation
- Enhances neuronal maturation
- Essential for studies of synaptic plasticity
- Extensively characterized in neuroscience research
Limitations
- Activity depends on TrkB receptor expression
- Not required for every neuronal culture system
- Optimal concentration varies among neuronal subtypes
- Typically combined with additional neuronal supplements and growth factors
Related Growth Factors
Frequently combined with:
- Nerve Growth Factor (NGF)
- Glial Cell Line-Derived Neurotrophic Factor (GDNF)
- Neurotrophin-3 (NT-3)
- Fibroblast Growth Factor 2 (FGF-2)
- Epidermal Growth Factor (EGF)
See Also
- Growth Factor Handling and Storage Guide
- Neurobasal Medium
- B-27 Supplement
- N-2 Supplement
- Neural Stem Cell Culture
- Brain Organoids
- TrkB Signaling
Key Takeaways
- BDNF is a major neurotrophin that regulates neuronal survival, maturation, and synaptic plasticity.
- It signals primarily through TrkB receptors to activate MAPK/ERK, PI3K-AKT, and PLCγ signaling pathways.
- BDNF is widely used in primary neuron, stem cell-derived neuron, and organoid culture systems.
- Mature BDNF and proBDNF have distinct biological functions that influence neuronal development and remodeling.
- Typical working concentrations range from 10-100 ng/mL depending on the application.
References
- Barde YA. Neuron (1989).
- Huang EJ, Reichardt LF. Annual Review of Biochemistry (2001).
- Park H, Poo MM. Nature Reviews Neuroscience (2013).
- Freshney RI. Culture of Animal Cells: A Manual of Basic Technique and Specialized Applications.
- Thermo Fisher Scientific. Recombinant Human BDNF Product Information.