P2RX5 Gene
Introduction
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">P2RX5 Gene</th>
</tr>
<tr>
<td class="label">Official Symbol</td>
<td>P2RX5</td>
</tr>
<tr>
<td class="label">Official Full Name</td>
<td>Purinergic Receptor P2X Ligand-Gated Ion Channel 5</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>17p13.1</td>
</tr>
<tr>
<td class="label">Gene ID</td>
<td>5026</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ligand-gated ion channel</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>422 amino acids</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">35 edges</a></td>
</tr>
</table>
The P2RX5 (Purinergic Receptor P2X Ligand-Gated Ion Channel 5) gene encodes a member of the P2X family of ATP-gated ion channels. P2X5 receptors are expressed in various tissues including lymphoid organs, bladder, and parts of the nervous system, with roles in immune function, sensory signaling, and more recently implicated in neurodegenerative diseases through purinergic signaling pathways[@north2002].
Overview
...P2RX5 Gene
Introduction
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">P2RX5 Gene</th>
</tr>
<tr>
<td class="label">Official Symbol</td>
<td>P2RX5</td>
</tr>
<tr>
<td class="label">Official Full Name</td>
<td>Purinergic Receptor P2X Ligand-Gated Ion Channel 5</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>17p13.1</td>
</tr>
<tr>
<td class="label">Gene ID</td>
<td>5026</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ligand-gated ion channel</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>422 amino acids</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">35 edges</a></td>
</tr>
</table>
The P2RX5 (Purinergic Receptor P2X Ligand-Gated Ion Channel 5) gene encodes a member of the P2X family of ATP-gated ion channels. P2X5 receptors are expressed in various tissues including lymphoid organs, bladder, and parts of the nervous system, with roles in immune function, sensory signaling, and more recently implicated in neurodegenerative diseases through purinergic signaling pathways[@north2002].
Overview
Mermaid diagram (expand to render)
P2RX5 is located on chromosome 17p13.1 and encodes a 422-amino acid protein that forms trimeric ion channels gated by extracellular ATP. Unlike other P2X receptors, P2RX5 has unique pharmacological properties and expression patterns that make it an interesting target for understanding purinergic signaling in both immune and nervous systems["@burnstock2017"].
Molecular Function
Ion Channel Properties
P2RX5 encodes an ATP-gated ion channel with distinctive properties:
- Ion permeability: Permeable to Na⁺, K⁺, and Ca²⁺
- ATP activation: Activated by extracellular ATP (EC₅₀ ~10 μM)
- Slow kinetics: Relatively slow activation and desensitization compared to other P2X receptors
- Trimeric assembly: Forms functional trimers
- pH sensitivity: Modulated by extracellular pH
Signaling Pathways
P2RX5 activation leads to:
Membrane depolarization
Calcium influx
Activation of downstream signaling cascades
Neurotransmitter release modulation
Expression Pattern
Peripheral Tissues
P2RX5 is highly expressed in:
- Lymphoid tissue (thymus, spleen)
- Bladder urothelium
- Dorsal root ganglion (subset of neurons)
- Heart and skeletal muscle
Central Nervous System
Lower expression in brain regions:
- [Cortex](/brain-regions/cortex)
- [Hippocampus](/brain-regions/hippocampus)
- Basal ganglia
- Spinal cord
In the CNS, P2RX5 is primarily expressed on:
- Certain populations of sensory [neurons](/entities/neurons)
- Immune cells ([microglia](/entities/microglia), astrocytes)
- Some neuronal subtypes
Role in Neurodegeneration
Alzheimer's Disease
P2RX5 may be implicated in AD through several mechanisms:
- Purinergic signaling dysregulation: ATP signaling is altered in AD brain
- Microglial activation: P2RX5 on [microglia](/cell-types/microglia-neuroinflammation) may modulate neuroinflammatory responses
- Calcium dysregulation: Channel dysfunction may contribute to calcium homeostasis issues
- Synaptic plasticity: May affect synaptic function through purinergic modulation[@abbracchio2009]
Parkinson's Disease
In PD models:
- Altered purinergic receptor expression in substantia nigra
- Potential role in dopaminergic neuron survival
- May modulate neuroinflammation
Neuroinflammation
P2RX5 contributes to neuroinflammatory processes:
- Microglial activation states
- Cytokine release modulation
- Immune cell trafficking
Disease Associations
P2RX5 has been implicated in several disease states, particularly those involving bladder dysfunction. The gene is associated with overactive bladder, interstitial cystitis, and urinary urgency, suggesting its important role in normal bladder physiology and the pathogenesis of urological disorders.
In addition to bladder-related conditions, P2RX5 is linked to various immune disorders. The gene appears to influence altered lymphocyte function, which may contribute to the development of autoimmune conditions. This is further supported by observations that P2RX5 dysregulation can lead to immunodeficiency states, highlighting its critical role in maintaining proper immune system homeostasis.
P2RX5 also plays a significant role in chronic pain pathways. The gene contributes to nociceptive signaling in a subset of neurons, thereby influencing how pain signals are transmitted and processed. This explains why P2RX5 has emerged as a potential target for analgesic development, as modulating its function could provide therapeutic benefits for patients suffering from chronic pain conditions.
Therapeutic Targeting
P2RX5 is being explored as a drug target:
- P2RX5 antagonists: Several compounds in development
- Bladder disorders: Potential therapeutic target for overactive bladder
- Immunomodulation: Targeting immune cell function
- Pain management: P2RX5 on sensory neurons
Drug Development
Current approaches:
- Selective antagonists
- Allosteric modulators
- Gene therapy approaches
Animal Models
- P2RX5 knockout mice are viable and fertile
- Show altered bladder function
- Modified immune responses
- Useful for studying purinergic signaling
Key Publications
[North RA, et al. (2002). Molecular physiology of P2X receptors. Physiol Rev](https://pubmed.ncbi.nlm.nih.gov/11917093/). PMID: 11917093(https://pubmed.ncbi.nlm.nih.gov/11917093/)
[Burnstock G, et al. (2017). Purinergic signaling in the nervous system. Neuron](https://pubmed.ncbi.nlm.nih.gov/28280347/). PMID: 28280347(https://pubmed.ncbi.nlm.nih.gov/28280347/)
[Abbracchio MP, et al. (2009). Purinergic signalling in the nervous system: an update. Nat Rev Neurosci](https://pubmed.ncbi.nlm.nih.gov/19325078/). PMID: 19325078(https://pubmed.ncbi.nlm.nih.gov/19325078/)P2RX5 knockout mice provide a valuable experimental model for investigating purinergic signaling pathways, as these animals remain viable and fertile despite the absence of this receptor. These knockout mice exhibit altered bladder function, demonstrating the important role that P2RX5 plays in urogenital physiology. In addition to the observed bladder dysfunction, the knockout animals display modified immune responses, which further supports the receptor's involvement in immunological processes. This combination of phenotypic changes makes P2RX5 knockout mice particularly useful for studying the broader implications of purinergic signaling in both physiological and pathological contexts.
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Neuroinflammation](/mechanisms/neuroinflammation)
External Links
- [NCBI Gene: P2RX5](https://www.ncbi.nlm.nih.gov/gene/5026)
- [UniProt: P2RX5 Human](https://www.uniprot.org/uniprotkb/Q99572)
- [IUPHAR: P2X5 Receptor](https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=482)
Background
The study of P2Rx5 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.
References
[North RA, et al., (2002). Molecular physiology of P2X receptors. Physiol Rev (2002)](https://pubmed.ncbi.nlm.nih.gov/11917093/)
[Burnstock G, et al., (2017). Purinergic signaling in the nervous system. Neuron (2017)](https://pubmed.ncbi.nlm.nih.gov/28280347/)
[Abbracchio MP, et al., (2009). Purinergic signalling in the nervous system: an update. Nat Rev Neurosci (2009)](https://pubmed.ncbi.nlm.nih.gov/19325078/)Pathway Diagram
The following diagram shows the key molecular relationships involving P2RX5 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)