P75NTR Gene

NGFR (p75NTR) Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">P75NTR Gene</th>
</tr>
<tr>
<td class="label">Domain</td>
<td>Position</td>
</tr>
<tr>
<td class="label">Signal peptide</td>
<td>1-28 aa</td>
</tr>
<tr>
<td class="label">Extracellular domain</td>
<td>29-224 aa</td>
</tr>
<tr>
<td class="label">Transmembrane domain</td>
<td>225-247 aa</td>
</tr>
<tr>
<td class="label">Intracellular domain</td>
<td>248-427 aa</td>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Outcome</td>
</tr>
<tr>
<td class="label">NF-κB</td>
<td>Survival or death depending on context</td>
</tr>
<tr>
<td class="label">JNK</td>
<td>Pro-apoptotic stress kinase cascade</td>
</tr>
<tr>
<td class="label">PI3K/Akt</td>
<td>Pro-survival signaling with Trk</td>
</tr>
<tr>
<td class="label">Ceramide</td>
<td>Pro-apoptotic lipid signaling</td>
</tr>
<tr>
<td class="label">Neurotrophin</td>
<td>Affinity</td>
</tr>
<tr>
<td class="label">NGF</td>
<td>High</td>
</tr>
<tr>
<td class="label">BDNF</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">NT-3</td>
<td>Low</td>
</tr>
<tr>
<td class="label">NT-4/5</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">Agonists</td>
<td>p75NTR agonists for neuroprotection</td>
</tr>
<tr>
<td class="label">Antagonists</td>
<td>Block pro-apoptotic signaling</

...

NGFR (p75NTR) Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">P75NTR Gene</th>
</tr>
<tr>
<td class="label">Domain</td>
<td>Position</td>
</tr>
<tr>
<td class="label">Signal peptide</td>
<td>1-28 aa</td>
</tr>
<tr>
<td class="label">Extracellular domain</td>
<td>29-224 aa</td>
</tr>
<tr>
<td class="label">Transmembrane domain</td>
<td>225-247 aa</td>
</tr>
<tr>
<td class="label">Intracellular domain</td>
<td>248-427 aa</td>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Outcome</td>
</tr>
<tr>
<td class="label">NF-κB</td>
<td>Survival or death depending on context</td>
</tr>
<tr>
<td class="label">JNK</td>
<td>Pro-apoptotic stress kinase cascade</td>
</tr>
<tr>
<td class="label">PI3K/Akt</td>
<td>Pro-survival signaling with Trk</td>
</tr>
<tr>
<td class="label">Ceramide</td>
<td>Pro-apoptotic lipid signaling</td>
</tr>
<tr>
<td class="label">Neurotrophin</td>
<td>Affinity</td>
</tr>
<tr>
<td class="label">NGF</td>
<td>High</td>
</tr>
<tr>
<td class="label">BDNF</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">NT-3</td>
<td>Low</td>
</tr>
<tr>
<td class="label">NT-4/5</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">Agonists</td>
<td>p75NTR agonists for neuroprotection</td>
</tr>
<tr>
<td class="label">Antagonists</td>
<td>Block pro-apoptotic signaling</td>
</tr>
<tr>
<td class="label">Modulators</td>
<td>Selective modulators in development</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Viral vector delivery</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">105 edges</a></td>
</tr>
</table>

Introduction

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.

Overview

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. [@ibanez1996]

--- [@roux2002]

Gene Structure

Genomic Organization

• Chromosomal location: 17q21.33
• Gene length: ~22 kb
• Exons: 6 exons
• mRNA length: ~3.5 kb

Protein

• Full name: Nerve Growth Factor Receptor (NGFR), p75NTR
• Molecular weight: ~75 kDa (glycosylated)
• Length: 427 amino acids (full-length), 28 kDa intracellular domain after cleavage
• Family: TNF receptor superfamily (TNFRSF16)

--- [@chao2003]

Protein Domain Architecture

Structural Organization

p75NTR contains several distinct domains: [@teng2004]

Extracellular Features

• Cysteine-rich domains: Four cysteine-rich repeat motifs (CRDs)
• Ligand binding sites: Bind NGF, BDNF, NT-3, NT-4/5 with different affinities
• Co-receptor binding: Interacts with sortilin, Nogo receptor

Normal Biological Functions

Dual Signaling Receptors

p75NTR functions as part of a receptor system:

• With Trk receptors: Enhances ligand binding specificity and Trk signaling
• With sortilin: Mediates pro-apoptotic signaling
• With Nogo receptor: Participates in axon guidance

Apoptotic Signaling

p75NTR can trigger neuronal death through:

• Death domain signaling: Activates caspase-3 and caspase-9
• JNK pathway: Pro-apoptotic kinase cascade
• [NF-κB](/entities/nf-kb) activation: Can lead to either survival or death
• Ceramide production: Pro-apoptotic lipid signaling

Pro-Survival Signaling

When co-expressed with Trk receptors:

• Enhanced Trk activation: Increases neurotrophin binding affinity
• Extended signal duration: Prolongs downstream signaling
• Synaptic plasticity: Modifies synaptic strength and structure

Developmental Functions

• Neuronal survival: During development, p75NTR regulates naturally occurring cell death
• Axon guidance: Via interactions with guidance molecules
• Synapse formation: Modulates synaptic connectivity
• Myelination: Regulates Schwann cell biology

Role in Neurodegenerative Diseases

Alzheimer's Disease

• Neuronal vulnerability: p75NTR expression increases in AD brain
• Amyloid-β interaction: [Aβ](/proteins/amyloid-beta) binds p75NTR and induces neurotoxicity
• [Tau](/proteins/tau) pathology: May link to neurofibrillary degeneration
• Cholinergic [neurons](/entities/neurons): Particularly vulnerable in basal forebrain ^[3]

Parkinson's Disease

• Dopaminergic neurons: p75NTR expressed in substantia nigra pars compacta
• Neuroprotection: Targeting p75NTR may protect neurons
• [α-Synuclein](/proteins/alpha-synuclein): May interact in pathogenic mechanisms

Amyotrophic Lateral Sclerosis (ALS)

• Motor neuron expression: p75NTR on vulnerable motor neurons
• Disease progression: Correlates with degeneration
• Therapeutic targeting: p75NTR modulators in development

Stroke and Brain Injury

• Ischemic response: p75NTR induced following injury
• Secondary damage: May mediate excitotoxic cell death
• Regeneration: Role in neural repair mechanisms

Psychiatric Disorders

• Depression: Altered p75NTR expression in stress models
• Anxiety: Linked to anxiety-related neural circuits
• Addiction: Modulates reward circuitry

Molecular Mechanisms

Signaling Pathways

p75NTR activates multiple downstream pathways:

Co-Receptor Interactions

• Sortilin: Required for pro-apoptotic signaling
• TrkA/TrkB: Forms heteromeric complexes with enhanced signaling
• Nogo receptor: Mediates inhibitory effects of myelin proteins
• LINGO-1: Component of inhibitory receptor complex

Ligand Binding Specificity

Therapeutic Implications

Drug Development

Biomarker Potential

• Peripheral detection: p75NTR in extracellular vesicles
• Disease progression: Levels correlate with severity
• Treatment response: Biomarker for therapeutic efficacy

Research Methods

Detection

• Antibodies: Multiple commercial antibodies available
• In situ hybridization: mRNA localization
• Flow cytometry: Cell surface expression

Model Systems

• Knockout mice: Ngfr null mice have developmental deficits
• Transgenic models: Overexpression and mutant lines
• Conditional knockouts: Tissue-specific deletion

Key Publications

[p75 and Trk: a two-receptor system](https://doi.org/10.1016/0166-2236(95)93928-F). Trends in Neurosciences, 1995. PMID: 7576012(https://pubmed.ncbi.nlm.nih.gov/7576012/)

[Neurotrophin signaling through the p75NTR](https://doi.org/10.1016/S0301-0082(02)00070-8). Progress in Neurobiology, 2002. PMID: 12169297(https://pubmed.ncbi.nlm.nih.gov/12169297/)

[Neurotrophins and their receptors: a convergence point for many signaling pathways](https://doi.org/10.1038/nrn1066). Nature Reviews Neuroscience, 2003. PMID: 12671646(https://pubmed.ncbi.nlm.nih.gov/12671646/)

[p75NTR in neurodegenerative diseases](https://doi.org/10.1016/j.neurobiolaging.2019.06.010). Neurobiology of Disease, 2019. PMID: 31220601(https://pubmed.ncbi.nlm.nih.gov/31220601/)

[Neurotrophin receptors: signaling mechanisms in development and plasticity](https://doi.org/10.1002/jcb.10399). Journal of Cellular Biochemistry, 2004. PMID: 14704852(https://pubmed.ncbi.nlm.nih.gov/14704852/)

[The p75 neurotrophin receptor](https://doi.org/10.1016/j.tins.2008.03.004). Trends in Neurosciences, 2008. PMID: 18456181(https://pubmed.ncbi.nlm.nih.gov/18456181/)

[Sortilin: a receptor to regulate neuronal viability and function](https://doi.org/10.1038/emboj.2012.105). EMBO Journal, 2012. PMID: 22510884(https://pubmed.ncbi.nlm.nih.gov/22510884/)

See Also

• [p75NTR Protein](/proteins/p75ntr-protein)
• [NGF Gene](/genes/ngf)
• [BDNF Gene](/genes/bdnf)
• [TRKA Gene](/genes/trka)
• [NGF Protein](/proteins/ngf-protein)
• [BDNF Protein](/proteins/bdnf-protein)
• [Basal Forebrain Cholinergic Neurons](/cell-types/basal-forebrain-cholinergic)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [ALS](/diseases/amyotrophic-lateral-sclerosis)
• [Neurotrophin Signaling](/mechanisms/neurotrophin-signaling)
• [Genes Index](/genes)

External Links

• UniProt: <a href="https://www.uniprot.org/uniprot/P08119" target="_blank">P08119</a>
• NCBI Gene: <a href="https://www.ncbi.nlm.nih.gov/gene/4800" target="_blank">NGFR</a>
• GeneCards: <a href="https://www.genecards.org/cgi-bin/carddisp.pl?gene=NGFR" target="_blank">NGFR</a>

Background

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.

Brain Atlas Resources

Allen Brain Atlas Links

The Allen Brain Atlas provides comprehensive gene expression data across brain regions and cell types.

• [Allen Human Brain Atlas](https://human.brain-map.org/) — Gene expression data across the adult human brain
• [Allen Mouse Brain Atlas](https://mouse.brain-map.org/) — Gene expression in mouse brain
• [Allen Cell Type Atlas](https://celltype.brain-map.org/) — Single-cell transcriptomics data
• [BrainSpan Atlas of the Developing Human Brain](https://brainspan.org/) — Developmental expression data
• [Allen Brain Map Portal](https://portal.brain-map.org/) — Access to all Allen Institute brain data

Gene-Specific Expression Data

Search for expression data on the Allen Brain Atlas:

• [Human Brain Atlas search for this gene](https://human.brain-map.org/microarray/search/show?search_term=p75NTR)

References

[Unknown, Chao, M.V. & Hempstead, B.L. (1995). p75 and Trk: a two-receptor system (1995)](https://pubmed.ncbi.nlm.nih.gov/7576012/)

[Unknown, Ibanez, C.F. (1996). Neurotrophin receptor interactions (1996)](https://pubmed.ncbi.nlm.nih.gov/8814431/)

[Unknown, Roux, P.P. & Barker, P.A. (2002). Neurotrophin signaling through the p75NTR (2002)](https://pubmed.ncbi.nlm.nih.gov/12169297/)

[Unknown, Chao, M.V. (2003). Neurotrophins and their receptors: a convergence point for many signaling pathways (2003)](https://pubmed.ncbi.nlm.nih.gov/12671646/)

[Unknown, Teng, K.K. & Hempstead, B.L. (2004). Neurotrophins and their receptors: signaling mechanisms in development and plasticity (2004)](https://pubmed.ncbi.nlm.nih.gov/14704852/)

[Unknown, Underwood, C.K. & Coulson, E.J. (2008). The p75 neurotrophin receptor (2008)](https://pubmed.ncbi.nlm.nih.gov/18076638/)

[Unknown, Nykjaer, A. & Willnow, T.E. (2012). Sortilin: a receptor to regulate neuronal viability and function (2012)](https://pubmed.ncbi.nlm.nih.gov/22510884/)

[Maffi, L. et al., (2019). p75NTR in neurodegenerative diseases (2019)](https://pubmed.ncbi.nlm.nih.gov/31220601/)

Pathway Diagram

The following diagram shows the key molecular relationships involving P75NTR Gene discovered through SciDEX knowledge graph analysis: