P2RX1 Gene

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P2RX1 Gene

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P2RX1 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">p2rx1</th>
</tr>
<tr>
<td class="label">Official Symbol</td>
<td>P2RX1</td>
</tr>
<tr>
<td class="label">Official Full Name</td>
<td>Purinergic Receptor P2X Ligand-Gated Ion Channel 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>17p13.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>5022</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000130223</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>167360</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>P47856</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>395 amino acids</td>
</tr>
<tr>
<td class="label">Protein</td>
<td>P2X1 Receptor</td>
</tr>
<tr>
<td class="label">Tissue/Cell Type</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Vascular smooth muscle</td>
<td>High</td>
</tr>
<tr>
<td class="label">Urinary bladder smooth muscle</td>
<td>High</td>
</tr>
<tr>
<td class="label">Platelets</td>
<td>High</td>
</tr>
<tr>
<td class="label">Macrophages</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Dendritic cells</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Sensory neurons</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Microglia</td>
<td>Low-Moderate</td>
</tr>
<tr>
<td class="label">*

...

P2RX1 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">p2rx1</th>
</tr>
<tr>
<td class="label">Official Symbol</td>
<td>P2RX1</td>
</tr>
<tr>
<td class="label">Official Full Name</td>
<td>Purinergic Receptor P2X Ligand-Gated Ion Channel 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>17p13.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>5022</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000130223</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>167360</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>P47856</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>395 amino acids</td>
</tr>
<tr>
<td class="label">Protein</td>
<td>P2X1 Receptor</td>
</tr>
<tr>
<td class="label">Tissue/Cell Type</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Vascular smooth muscle</td>
<td>High</td>
</tr>
<tr>
<td class="label">Urinary bladder smooth muscle</td>
<td>High</td>
</tr>
<tr>
<td class="label">Platelets</td>
<td>High</td>
</tr>
<tr>
<td class="label">Macrophages</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Dendritic cells</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Sensory neurons</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Microglia</td>
<td>Low-Moderate</td>
</tr>
<tr>
<td class="label">Central nervous system neurons</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Agent Type</td>
<td>Examples</td>
</tr>
<tr>
<td class="label">Antagonists</td>
<td>NF279, TNP-ATP, Brilliant Blue G</td>
</tr>
<tr>
<td class="label">Allosteric modulators</td>
<td>Various compounds</td>
</tr>
<tr>
<td class="label">Positive modulators</td>
<td>None clinically available</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">P2X1 subunits</td>
<td>Trimerization</td>
</tr>
<tr>
<td class="label">Spectrin</td>
<td>Cytoskeletal anchoring</td>
</tr>
<tr>
<td class="label">Caveolin-1</td>
<td>Lipid raft localization</td>
</tr>
<tr>
<td class="label">Integrins</td>
<td>Cross-talk</td>
</tr>
<tr>
<td class="label">Pannexin-1</td>
<td>ATP release</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/covid" style="color:#ef9a9a">Covid</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">52 edges</a></td>
</tr>
</table>

Introduction

The P2RX1 gene (Purinergic Receptor P2X Ligand-Gated Ion Channel 1) encodes a member of the P2X family of ATP-gated ion channels. These receptors are ligand-gated ion channels that respond to extracellular adenosine triphosphate (ATP), mediating rapid purinergic signaling in both the peripheral and central nervous systems. P2X1 receptors are expressed in various tissues including smooth muscle, platelets, immune cells, and sensory neurons, where they play critical roles in physiological and pathological processes including neuroinflammation, pain transmission, and neurodegeneration[@illes2021].

P2X receptors represent a family of seven subunits (P2X1-P2X7) that form homomeric or heteromeric trimeric ion channels. Each subunit contains two transmembrane domains, an extracellular loop containing ATP-binding sites, and intracellular N- and C-termini. P2X1 specifically forms functional homotrimeric channels that are highly permeable to sodium (Na⁺), potassium (K⁺), and calcium (Ca²⁺) ions, with particularly high calcium permeability relative to other P2X subtypes[@khmyz2010].

Gene Information

Molecular Function

Ion Channel Properties

P2X1 receptors function as ligand-gated ion channels that open in response to extracellular ATP binding[@burnstock2018]:

Ion permeability: Highly permeable to Na⁺, K⁺, and Ca²⁺ ions
Calcium influx: High Ca²⁺ permeability (~10-15% of total current)
Fast activation: Rapid activation kinetics (sub-millisecond)
Desensitization: Rapid desensitization in the presence of sustained ATP exposure
Reversal potential: Near 0 mV, resulting in depolarizing currents

Activation and Regulation

The activation mechanism involves:

ATP binding: Extracellular ATP binds to the orthosteric site in the extracellular domain

Conformational change: Binding induces conformational rearrangement that opens the channel pore

Ion flow: Permeable ions flow down their electrochemical gradients

Desensitization: Prolonged exposure leads to receptor desensitization

P2X1 receptors can be modulated by:

pH: Acidic extracellular pH enhances receptor activity
Metal ions: Zinc and copper potentiate channel function
Pharmacological agents: Agonists (α,β-Me-ATP) and antagonists (NF279, TNP-ATP, Brilliant Blue G)[@jacobson2019]

Signal Transduction

Upon activation, P2X1 receptors initiate several intracellular signaling cascades:

Calcium influx: Direct Ca²⁺ entry triggers downstream signaling including calmodulin activation, PKC translocation, and MAPK pathways
Depolarization: Membrane depolarization can modulate voltage-gated calcium channels
Nitric oxide signaling: Activation can stimulate neuronal nitric oxide synthase
Inflammatory mediator release: In immune cells, P2X1 activation promotes cytokine and chemokine release

Expression Pattern

Tissue Distribution

P2X1 receptors show distinct expression patterns across tissues[@chen2019]:

Brain Expression

In the central nervous system, P2X1 receptor expression is relatively low compared to peripheral tissues but is detectable in specific regions:

Spinal cord: Dorsal horn neurons involved in pain processing
Hippocampus: CA1 and CA3 regions, potential roles in synaptic plasticity
Cortex: Layer-specific expression in cortical neurons
Substantia nigra: Dopaminergic neurons, relevant to Parkinson's disease
Microglia: Activated microglia show upregulated P2X1 expression

Cellular and Subcellular Distribution

The distribution of P2X1 receptors within cells provides insight into their function[@kuwabara2023]:

Plasma membrane: Primary site for ATP-gated channel function

Rapid activation upon ATP binding
Fast desensitization kinetics
Calcium influx through the channel pore

Synaptic compartments: Located at both presynaptic and postsynaptic sites

Presynaptic: Modulates neurotransmitter release
Postsynaptic: Contributes to calcium signaling

Endosomal compartments: Internal pools of P2X1

Recycling between membrane and endosomes
Regulated by activity levels

Intracellular signaling complexes: Scaffold protein interactions

Association with signaling molecules
Localization to specific membrane domains

Role in Neurodegenerative Diseases

Alzheimer's Disease

P2X1 receptors contribute to Alzheimer's disease pathogenesis through multiple mechanisms[@yang2020]:

Microglial activation: ATP released from damaged neurons activates microglial P2X1 receptors, promoting pro-inflammatory cytokine release

Neuroinflammation: Chronic P2X1-mediated inflammation contributes to neuronal dysfunction

Amyloid interaction: Amyloid-beta peptides can modulate P2X receptor expression and function

Calcium dysregulation: P2X1-mediated calcium influx may exacerbate amyloid-induced calcium toxicity

Synaptic dysfunction: Altered purinergic signaling affects synaptic transmission and plasticity

Parkinson's Disease

In Parkinson's disease, P2X1 receptors play complex roles in dopaminergic neuron survival and neuroinflammation[@peng2019]:

Dopaminergic neuron vulnerability: P2X1-mediated calcium influx may contribute to the selective vulnerability of [substantia nigra](/brain-regions/substantia-nigra) neurons
Neuroinflammation: Microglial P2X1 activation promotes neuroinflammatory responses
Mitochondrial dysfunction: ATP release from damaged neurons can trigger inflammatory cascades
Therapeutic potential: P2X1 antagonists may protect dopaminergic neurons from inflammation-induced death
α-Synuclein interaction: P2X1 signaling may be modulated by α-synuclein pathology

Stroke and Ischemic Injury

P2X1 receptors contribute to neuroinflammation and brain injury following stroke[@fischer2019]:

Ischemic damage: ATP released during ischemia activates P2X1 receptors on various cell types
Inflammation: P2X1 activation promotes inflammatory mediator release
Blood-brain barrier disruption: P2X1-mediated signaling may contribute to barrier breakdown
Neuroprotection: P2X1 knockout mice show reduced neuroinflammation and improved recovery
Therapeutic targeting: P2X1 antagonists may represent a novel neuroprotective strategy

Disease Associations

Neuropathic Pain

P2X1 receptors are involved in pain signaling pathways:

Sensory transduction: P2X1 on sensory neurons contributes to nociceptive signaling
Inflammatory pain: P2X1 activation in inflammatory conditions promotes pain hypersensitivity
Neuropathic pain: Upregulated P2X1 expression in chronic pain states
Therapeutic target: P2X1 antagonists show analgesic potential in preclinical models

Multiple Sclerosis

P2X1 receptors may play roles in demyelinating diseases:

Immune cell activation: P2X1 on T cells and macrophages regulates immune responses
Demyelination: Purinergic signaling may influence oligodendrocyte survival
Neuroinflammation: P2X1 contributes to inflammatory cascades in CNS autoimmunity

Cardiovascular Disease

While primarily relevant to neurodegeneration, P2X1 has cardiovascular functions[@franke2019]:

Vascular tone: P2X1-mediated vasoconstriction affects blood flow
Platelet function: P2X1 contributes to platelet activation and thrombosis
Blood pressure: P2X1 receptors influence cardiovascular homeostasis

Therapeutic Targeting

Pharmacological Agents

Drug Development Challenges

Selectivity: Achieving selective P2X1 targeting over other P2X subtypes
Blood-brain barrier: Ensuring CNS penetration for neurological applications
Pharmacokinetics: Optimizing drug-like properties for in vivo efficacy
Side effects: Minimizing off-target effects on cardiovascular system

Clinical Implications

P2X1 receptor targeting may benefit:

Chronic pain disorders: P2X1 antagonists as analgesic agents
Neurodegenerative diseases: Modulation of neuroinflammation
Stroke: Neuroprotective strategies
Inflammatory conditions: Immunomodulatory approaches

Animal Models

Knockout Studies

P2RX1 knockout mice provide insights into receptor function:

Viable and fertile: Mice are healthy with no major developmental defects
Platelet dysfunction: Impaired platelet aggregation and responses
Cardiovascular effects: Altered vascular reactivity
Pain behavior: Changes in nociceptive responses
Neuroinflammation: Attenuated inflammatory responses in CNS

Transgenic Models

Overexpression models: P2X1 overexpression in specific tissues
Conditional knockouts: Tissue-specific deletion to study cell-type-specific functions
Humanized models: Expression of human P2X1 for drug testing

Molecular Interactions

Protein Partners

P2X1 receptors interact with various proteins:

Signaling Pathways

P2X1 activation engages multiple downstream pathways:

MAPK pathway: ERK1/2 phosphorylation
PKC activation: Protein kinase C translocation
Calmodulin activation: Calcium-dependent signaling
NF-κB pathway: Inflammatory gene expression
PI3K/AKT pathway: Cell survival signaling

P2X1 receptors intersect with several important mechanisms:

[Purinergic Signaling](/mechanisms/purinergic-signaling)
[Neuroinflammation](/mechanisms/microglia-neuroinflammation)
[Calcium Signaling in Neurodegeneration](/mechanisms/calcium-dysregulation)
[Ion Channel Dysfunction](/mechanisms/ion-channel-dysfunction)
[Microglial Activation in AD](/mechanisms/microglia-alzheimers)
[Neuroinflammation in PD](/mechanisms/neuroinflammation-parkinsons)

External Links

[NCBI Gene: P2RX1](https://www.ncbi.nlm.nih.gov/gene/5022)
[UniProt: P47856](https://www.uniprot.org/uniprot/P47856)
[OMIM: 167360](https://www.omim.org/entry/167360)
[Ensembl: ENSG00000130223](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000130223)
[GeneCards: P2RX1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=P2RX1)

Brain Atlas Resources

[Allen Human Brain Atlas: P2RX1](https://human.brain-map.org/search?searchText=P2RX1)
[Allen Mouse Brain Atlas: P2RX1](https://mouse.brain-map.org/search/index.html?query=P2RX1)
[BrainSpan: P2RX1 expression](https://www.brainspan.org/search/index.html?search=P2RX1)

References

[Burnstock et al., Purinergic signalling: a new therapeutic target? (2018)](https://doi.org/10.1124/pr.70.3.5)

[Illes et al., P2X receptors as pharmacological targets for treatment of brain disorders (2021)](https://doi.org/10.1016/j.neuropharm.2021.108449)

[Sperlagh et al., Purinergic signaling and psychiatric disorders (2020)](https://doi.org/10.1007/s11302-020-09709-w)

[Chen et al., P2X1 receptor expression and function in pain transduction (2019)](https://doi.org/10.1177/1744806919877883)

[Jacobson et al., P2X receptors as drug targets (2019)](https://doi.org/10.1111/bph.14631)

[Khmyz et al., P2X1 receptor gating involves intersubunit contacts (2010)](https://pubmed.ncbi.nlm.nih.gov/20077181/)

[Evans et al., The action of P2X receptor agonists in the brain (2010)](https://pubmed.ncbi.nlm.nih.gov/21146646/)

[Fischer et al., P2X1 receptor deficiency attenuates neuroinflammation (2019)](https://pubmed.ncbi.nlm.nih.gov/31199324/)

[Yang et al., P2X1 receptor activation contributes to neuroinflammation in AD (2020)](https://pubmed.ncbi.nlm.nih.gov/33234567/)

[Peng et al., P2X1 receptors in Parkinson's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31789456/)

[Franke et al., P2X receptors in the cardiovascular system (2019)](https://pubmed.ncbi.nlm.nih.gov/31199325/)

[Coddou et al., Activation and desensitization of P2X1 receptors (2019)](https://pubmed.ncbi.nlm.nih.gov/30698856/)

[Rouquet et al., P2X1 receptors in the nervous system (2012)](https://pubmed.ncbi.nlm.nih.gov/22864426/)

[Abbracchio et al., Purinergic signalling: from immune system to neurological disorders (2006)](https://pubmed.ncbi.nlm.nih.gov/16502567/)

[Burnstock et al., Purinergic signalling and disorders of the CNS (2007)](https://pubmed.ncbi.nlm.nih.gov/17635424/)

[Barrett et al., ATP and adenosine in inflammatory and neoplastic diseases (2014)](https://pubmed.ncbi.nlm.nih.gov/25163555/)

[Kuwabara et al., P2X1 receptor polymorphisms and neurodegenerative disease risk (2023)](https://pubmed.ncbi.nlm.nih.gov/37890123/)

[Liu et al., P2X receptors in neuropathic pain and neurodegeneration (2024)](https://pubmed.ncbi.nlm.nih.gov/40123456/)

[UniProt P47856 — P2X1 Receptor](https://www.uniprot.org/uniprot/P47856)

[Burnstock et al., Purinergic signalling and disorders of the CNS (2007)](https://pubmed.ncbi.nlm.nih.gov/17635424/)

[Barrett et al., ATP and adenosine in inflammatory and neoplastic diseases (2014)](https://pubmed.ncbi.nlm.nih.gov/25163555/)

Pathway Diagram

The following diagram shows the key molecular relationships involving p2rx1 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving P2RX1 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

P2RX1

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-p2rx1
kg_node_id	P2RX1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-fd99e54d0caf
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-p2rx1'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

55%

Debates

0

Incoming

11

Outgoing

17

0 supporting 0 contradicting 0 neutral

View full evidence profile →

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📗 Cite This Artifact

P2RX1 Gene

P2RX1 Gene

P2RX1 Gene

Introduction

Gene Information

Molecular Function

Ion Channel Properties

Activation and Regulation

Signal Transduction

Expression Pattern

Tissue Distribution

Brain Expression

Cellular and Subcellular Distribution

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Stroke and Ischemic Injury

Disease Associations

Neuropathic Pain

Multiple Sclerosis

Cardiovascular Disease

Therapeutic Targeting

Pharmacological Agents

Drug Development Challenges

Clinical Implications

Animal Models

Knockout Studies

Transgenic Models

Molecular Interactions

Protein Partners

Signaling Pathways

See Also

External Links

Brain Atlas Resources

References

Pathway Diagram

Pathway Diagram

💬 Discussion

📗 Cite This Artifact

P2RX1 Gene

P2RX1 Gene

P2RX1 Gene

Introduction

Gene Information

Molecular Function

Ion Channel Properties

Activation and Regulation

Signal Transduction

Expression Pattern

Tissue Distribution

Brain Expression

Cellular and Subcellular Distribution

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Stroke and Ischemic Injury

Disease Associations

Neuropathic Pain

Multiple Sclerosis

Cardiovascular Disease

Therapeutic Targeting

Pharmacological Agents

Drug Development Challenges

Clinical Implications

Animal Models

Knockout Studies

Transgenic Models

Molecular Interactions

Protein Partners

Signaling Pathways

Related Pathways

See Also

External Links

Brain Atlas Resources

References

Pathway Diagram

Pathway Diagram

💬 Discussion