Bdnf — Brain Derived Neurotrophic Factor is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
**Gene Symbol:** BDNF
**Full Name:** Brain-Derived Neurotrophic Factor
**Chromosomal Location:** 11p14.1
**NCBI Gene ID:** 627
**OMIM:** 113505
**Ensembl ID:** ENSG00000176697
**UniProt:** P23560 (BDNF_HUMAN)
**Associated Diseases:** Alzheimer's Disease, Parkinson's Disease, Huntington's Disease, Major Depressive Disorder, Rett Syndrome
BDNF (Brain-Derived Neurotrophic Factor) is a critical neurotrophin that supports neuronal survival and function throughout the brain.
Brain-Derived Neurotrophic Factor (BDNF) is a member of the neurotrophin family of growth factors, which also includes NGF (Nerve Growth Factor), NT-3 (Neurotrophin-3), and NT-4 (Neurotrophin-4). BDNF is the most widely expressed neurotrophin in the brain and plays essential roles in neuronal survival, development, plasticity, and function.
BDNF binds to two classes of receptors:
BDNF signaling through TrkB activates multiple downstream pathways:
BDNF is highly expressed in:
BDNF expression is activity-dependent — neuronal activity, learning, and environmental enrichment increase BDNF transcription.
BDNF plays a critical role in:
Genetic associations: BDNF Val66Met polymorphism (rs6265) affects activity-dependent secretion and is associated with:
Therapeutic targeting: BDNF delivery strategies include:
BDNF supports:
Therapeutic potential: AAV-mediated BDNF gene delivery to the striatum has shown neuroprotective effects in PD models and is in clinical development.
BDNF is crucial for:
Dysregulation: BDNF expression is reduced in HD brains, contributing to striatal degeneration. Therapeutic strategies aim to restore BDNF levels.
BDNF is a key mediator of antidepressant efficacy:
| Approach | Status | Description |
|---|---|---|
| Recombinant BDNF | Preclinical/Clinical | Protein delivery; limited by blood-brain barrier |
| AAV-BDNF gene therapy | Clinical trials | Viral vector delivery to brain regions |
| TrkB agonists | Preclinical | Small molecules that activate TrkB |
| Exercise | Proven | Increases endogenous BDNF expression |
| SSRIs | Approved | Increase BDNF expression indirectly |
The study of Bdnf — Brain Derived Neurotrophic Factor has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.