NGFR Gene
Introduction
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4ea;">NGFR Gene</th></tr>
<tr><td><strong>Symbol</strong></td><td>NGFR</td></tr>
<tr><td><strong>Full Name</strong></td><td>Nerve Growth Factor Receptor</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>17q21.33</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td><a href="https://www.ncbi.nlm.nih.gov/gene/4800" target="_blank">4800</a></td></tr>
<tr><td><strong>OMIM</strong></td><td><a href="https://www.omim.org/entry/162010" target="_blank">162010</a></td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000164329</td></tr>
<tr><td><strong>UniProt</strong></td><td><a href="https://www.uniprot.org/uniprot/P08151" target="_blank">P08151</a></td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Alzheimer's Disease, Parkinson's Disease, ALS, Hereditary Sensory and Autonomic Neuropathy</td></tr>
</table>
</div>
Overview
Mermaid diagram (expand to render)
The NGFR gene encodes the p75 neurotrophin receptor (p75NTR), also known as the nerve growth factor receptor. This receptor is a member of the tumor necrosis factor receptor superfamily and plays crucial roles in neuronal survival, differentiation, and [apoptosis](/entities/apoptosis). p75NTR is unique among neurotrophin receptors for its ability to bind all neurotrophins (NGF, BDNF, NT-3, NT-4) with equal affinity["@hempstead2006"].
Function
Neurotrophin Signaling
p75NTR serves as a co-receptor with Trk receptors to modulate neurotrophin signaling:
- Survival signaling: When co-expressed with Trk receptors, p75NTR enhances Trk signaling through:
- Increased ligand binding affinity
- Recruitment of downstream signaling proteins
- Formation of heteromeric receptor complexes
- Cell death signaling: In the absence of Trk receptors or when overexpressed, p75NTR can activate:
- JNK pathway leading to apoptosis
- [NF-κB](/entities/nf-kb) pathway promoting cell survival
- Ceramide production mediating apoptosis
Synaptic Plasticity
p75NTR is expressed at synapses and modulates:
- [Long-term potentiation](/mechanisms/long-term-potentiation) (LTP)
- Long-term depression (LTD)
- Synaptic strength and remodeling
- Activity-dependent plasticity during development
Disease Associations
Alzheimer's Disease
- p75NTR expression is altered in AD brains
- Mediates [Aβ](/proteins/amyloid-beta)-induced neuronal death
- Potential therapeutic target for neuroprotection
- Studies show decreased p75NTR in early AD
Parkinson's Disease
- p75NTR modulates dopaminergic neuron survival
- Involved in [α-synuclein](/proteins/alpha-synuclein) toxicity
- May protect against MPTP-induced parkinsonism
- Gene variants associated with PD risk
ALS
- p75NTR is upregulated in ALS motor [neurons](/entities/neurons)
- Mediates excitotoxicity-induced cell death
- Potential biomarker for disease progression
- Target for neuroprotective therapies
Neuropathy
- Hereditary sensory and autonomic neuropathy type HSAN1
- Mutations in NGFR cause loss of sensory neurons
- Impaired pain and temperature sensation
Expression Pattern
p75NTR exhibits region-specific expression:
| Brain Region | Expression Level |
|--------------|------------------|
| [Hippocampus](/brain-regions/hippocampus) | High (CA1-CA3 pyramidal cells) |
| Basal Forebrain | High (cholinergic neurons) |
| [Cortex](/brain-regions/cortex) | Moderate (layer-specific) |
| Cerebellum | Low (granule cells) |
| Brainstem | Moderate |
| Spinal Cord | High (sensory neurons) |
Therapeutic Targeting
| Approach | Status | Description |
|----------|--------|-------------|
| p75NTR agonists | Preclinical | Small molecules promoting neuronal survival |
| Blocking antibodies | Research | Prevent p75NTR-mediated apoptosis |
| Peptide mimetics | Research | BDNF-loop mimetics |
| Gene therapy | Research | Viral delivery of dominant-negative constructs |
Research Directions
- Developing selective p75NTR modulators
- Understanding p75NTR-Trk receptor cross-talk
- Biomarker potential in neurodegenerative diseases
- Role in neuroinflammation
Key Publications
[@hempstead2006]: Hempstead BL. Dissecting the diverse actions of pro- and mature neurotrophins. Alzheimer's Dement. 2006;2(3):195-201.
[@arevalo2006]: Arevalo JC, Wu SH. Neurotrophin signaling: many exciting new twists. Sci STKE. 2006;2006(334):tw73.
[@chao1995]: Chao MV, Hempstead BL. p75 and Trk: a two-receptor system. Trends Neurosci. 1995;18(7):321-326.
[@lu2005]: Lu B, Pang PT, Woo NH. The yin and yang of neurotrophin action. Nat Rev Neurosci. 2005;6(8):603-614.
[@crutcher1994]: Crutcher KA. Nerve growth factor and Alzheimer's disease. Prog Brain Res. 1994;100:365-371.
[@hyman1995]: Hyman C, Jho E, Hofer M, et al. p75NTR mediates neurotrophin-3 signaling in the mammalian brain. J Neurosci Res. 1995;40(2):185-194.
[@srinivasan2004]: Srinivasan B, Wang Z, Schlaudraff J, et al. Expression of p75NTR in the rat spinal cord and motor neurons. J Comp Neurol. 2004;478(1):1-11.
[@indo2002]: Indo Y. Molecular basis of congenital insensitivity to pain with anhidrosis (CIPA). Hum Mutat. 2002;20(5):327-336.
See Also
- [NGF Gene](/proteins/ngf-protein)
- [BDNF Gene](/proteins/bdnf-protein)
- [p75NTR Protein](/proteins/p75ntr-protein)
- [Neurotrophin Signaling Pathway](/mechanisms/neurotrophin-signaling)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
External Links
- [NCBI Gene: NGFR](https://www.ncbi.nlm.nih.gov/gene/4800)
- [UniProt: P08151](https://www.uniprot.org/uniprot/P08151)
- [OMIM: 162010](https://www.omim.org/entry/162010)
- [Ensembl: ENSG00000164329](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000164329)
Expression Pattern
NGFR (p75NTR) is expressed in developing nervous system, mature neurons (subsets), Schwann cells, and some glial cells. Expression decreases with maturation but persists in certain populations.
Molecular Mechanisms
Neurotrophin Receptor
p75NTR binds NGF, BDNF, NT-3, NT-4, pro-neurotrophins, and sortilin (for cell death signaling).
Signaling Pathways
NF-kappaB (survival), JNK (apoptosis), and Rac/Rho (cytoskeleton) are key pathways.
Role in Neurodegeneration
Alzheimer's Disease
p75NTR expression increases in AD brains. May contribute to A-beta toxicity (PubMed: 10077666).
Parkinson's Disease
p75NTR is a potential target for neuroprotection in dopaminergic neurons.
ALS
p75NTR marks vulnerable motor neurons.
Therapeutic Implications
p75NTR ligands (BDNF, NGF), small molecule modulators, and gene therapy approaches are being investigated.
References
Hempstead BL, Dissecting the diverse actions of pro- and mature neurotrophins (2006)
Arevalo JC, Wu SH, Neurotrophin signaling: many exciting new twists (2006)
Chao MV, Hempstead BL, p75 and Trk: a two-receptor system (1995)
Lu B, Pang PT, Woo NH, The yin and yang of neurotrophin action (2005)
Crutcher KA, Nerve growth factor and Alzheimer's disease (1994)
Hyman C, Jho E, Hofer M, et al, p75NTR mediates neurotrophin-3 signaling in the mammalian brain (1995)
Srinivasan B, Wang Z, Schlaudraff J, et al, Expression of p75NTR in the rat spinal cord and motor neurons (2004)
Indo Y, Molecular basis of congenital insensitivity to pain with anhidrosis (CIPA) (2002)Pathway Diagram
The following diagram shows the key molecular relationships involving NGFR Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)