P75Ntr Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
NGFR (Nerve Growth Factor Receptor), also known as p75NTR (p75 Neurotrophin Receptor), is a member of the tumor necrosis factor (TNF) receptor superfamily that functions as a versatile neurotrophin receptor with complex signaling capabilities [1]. Unlike the Trk family receptors (TrkA, TrkB, TrkC) which primarily mediate pro-survival signaling, p75NTR can promote both neuronal survival and cell death depending on cellular context, co-receptor usage, and neurotrophin availability [2]. This receptor plays critical roles in development, synaptic plasticity, and neurodegeneration.
p75NTR contains several distinct domains:
| Domain | Position | Function |
|---|---|---|
| Signal peptide | 1-28 aa | Targeting to plasma membrane |
| Extracellular domain | 29-224 aa | Ligand binding, contains cysteine repeats |
| Transmembrane domain | 225-247 aa | Single pass α-helix |
| Intracellular domain | 248-427 aa | Death domain, signaling |
p75NTR functions as part of a receptor system:
p75NTR can trigger neuronal death through:
When co-expressed with Trk receptors:
p75NTR activates multiple downstream pathways:
| Pathway | Outcome |
|---|---|
| NF-κB | Survival or death depending on context |
| JNK | Pro-apoptotic stress kinase cascade |
| PI3K/Akt | Pro-survival signaling with Trk |
| Ceramide | Pro-apoptotic lipid signaling |
| Neurotrophin | Affinity |
|---|---|
| NGF | High |
| BDNF | Moderate |
| NT-3 | Low |
| NT-4/5 | Moderate |
| Strategy | Approach |
|---|---|
| Agonists | p75NTR agonists for neuroprotection |
| Antagonists | Block pro-apoptotic signaling |
| Modulators | Selective modulators in development |
| Gene therapy | Viral vector delivery |
p75 and Trk: a two-receptor system. Trends in Neurosciences, 1995. PMID:7576012
Neurotrophin signaling through the p75NTR. Progress in Neurobiology, 2002. PMID:12169297
Neurotrophins and their receptors: a convergence point for many signaling pathways. Nature Reviews Neuroscience, 2003. PMID:12671646
p75NTR in neurodegenerative diseases. Neurobiology of Disease, 2019. PMID:31220601
Neurotrophin receptors: signaling mechanisms in development and plasticity. Journal of Cellular Biochemistry, 2004. PMID:14704852
The p75 neurotrophin receptor. Trends in Neurosciences, 2008. PMID:18456181
Sortilin: a receptor to regulate neuronal viability and function. EMBO Journal, 2012. PMID:22510884
The study of P75Ntr Gene 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.
Chao, M.V. & Hempstead, B.L. (1995). p75 and Trk: a two-receptor system. Trends in Neurosciences, 18(7), 321-326. PMID:7576012
Ibanez, C.F. (1996). Neurotrophin receptor interactions. Seminars in Cell & Developmental Biology, 7(2), 215-221. PMID:8814431
Roux, P.P. & Barker, P.A. (2002). Neurotrophin signaling through the p75NTR. Progress in Neurobiology, 67(3), 203-233. PMID:12169297
Chao, M.V. (2003). Neurotrophins and their receptors: a convergence point for many signaling pathways. Nature Reviews Neuroscience, 4(4), 299-309. PMID:12671646
Teng, K.K. & Hempstead, B.L. (2004). Neurotrophins and their receptors: signaling mechanisms in development and plasticity. Cellular and Molecular Life Sciences, 61(1), 35-48. PMID:14704852
Underwood, C.K. & Coulson, E.J. (2008). The p75 neurotrophin receptor. International Journal of Biochemistry & Cell Biology, 40(9), 1664-1668. PMID:18076638
Nykjaer, A. & Willnow, T.E. (2012). Sortilin: a receptor to regulate neuronal viability and function. EMBO Journal, 31(9), 1985-1991. PMID:22510884
Maffi, L. et al. (2019). p75NTR in neurodegenerative diseases. Neurobiology of Disease, 130, 104524. PMID:31220601
Last updated: 2026-03-07