| TrkA Protein | |
|---|---|
| Protein Name | Tropomyosin Receptor Kinase A |
| Gene | NTRK1 |
| UniProt ID | P04629 |
| PDB ID | 1WWA, 2CT0, 4GT4 |
| Molecular Weight | 140 kDa (full-length) |
| Subcellular Localization | Plasma membrane, endosomes |
| Protein Family | Trk receptor tyrosine kinase family |
Tropomyosin receptor kinase A (TrkA) is a high-affinity receptor for nerve growth factor (NGF), a member of the tropomyosin receptor kinase (Trk) family. TrkA plays critical roles in the development, survival, and function of specific neuronal populations, particularly sensory and sympathetic neurons, as well as cholinergic neurons in the basal forebrain. In the context of neurodegenerative diseases, TrkA signaling is of particular interest due to its essential role in maintaining cholinergic neurons that degenerate in Alzheimer's disease. Dysregulation of the NGF/TrkA pathway contributes to the cholinergic deficit observed in AD, making this receptor a therapeutic target for enhancing neuronal survival and function.
TrkA is a receptor tyrosine kinase with the following domains:
The receptor dimerizes upon NGF binding, leading to activation of downstream signaling cascades.
TrkA mediates the effects of nerve growth factor (NGF):
| Strategy | Agent | Status | Notes |
|---|---|---|---|
| NGF mimetics | |||
| TrkB/TrkA agonists | 7,8-DHF | Preclinical | Also activates TrkB |
| Gene therapy | AAV-NGF | Preclinical | Sustained expression |