TRPA1 Protein
Overview
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">TRPA1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>TRPA1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>TRPA1</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=TRPA1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</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">210 edges</a></td>
</tr>
</table>
Pathway Diagram
Mermaid diagram (expand to render)
## TRPA1 Protein is a protein. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
TRPA1 Protein
Structure
TRPA1 (Transient Receptor Potential Ankyrin 1) is a calcium-permeable non-selective cation channel characterized by 16-18 ankyrin repeat domains in its N-terminus, making it the most ankyrin-rich TRP channel[@nilius2014]. The channel forms tetramers with six transmembrane domains per subunit.
Key structural features:
- Ankyrin Repeat Domain (ARD): 16-18 ankyrin repeats for protein-protein interactions
- Coiled-coil domain: Involved in tetramerization
- N-terminal cysteine-rich domain: Contains reactive cysteine residues for electrophile sensing
- S5-S6 pore domain: Forms the ion conduction pathway
Normal Function in the Nervous System
TRPA1 functions as an oxidative stress sensor and is activated by[@venkatachalam2007][@jordt2004]:
- Electrophiles: Mustard oil (allyl isothiocyanate), cinnamaldehyde, acrolein
- Environmental irritants: Tear gas, formalin
- Endogenous mediators: 4-hydroxynonenal (4-HNE), prostaglandin metabolites
- Cold: Noxious cold (<17°C)
In the nervous system:
- Sensory [neurons](/entities/neurons): Dorsal root ganglion, trigeminal ganglion
- Central nervous system: [Hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), cerebellum
- Enteric nervous system: Gastrointestinal tract
Physiological roles:
- Chemesthesis: Detection of irritant chemicals
- Oxidative stress sensing: Activation by electrophilic metabolites
- Pain transduction: Nociceptor for inflammatory pain
- Neurotransmitter release: Modulation of glutamate release
Role in Neurodegeneration
TRPA1 dysregulation contributes to neurodegenerative processes[@liu2020][@staats2020]:
Alzheimer's Disease
- Oxidative stress: 4-HNE (a lipid peroxidation product) activates TRPA1
- [Amyloid-beta](/proteins/amyloid-beta): Aβ-induced oxidative stress activates TRPA1
- Calcium dysregulation: TRPA1-mediated calcium influx triggers [apoptosis](/entities/apoptosis)
- Neuroinflammation: Microglial TRPA1 promotes cytokine release
Parkinson's Disease
- Mitochondrial toxins: MPTP and 6-OHDA activate TRPA1
- Oxidative stress: Increased TRPA1 expression in PD models
- Dopaminergic neuron death: TRPA1-mediated excitotoxicity
- Therapeutic potential: TRPA1 antagonists may protect neurons
Amyotrophic Lateral SALS
- Oxidative stress: Increased [reactive oxygen species](/entities/reactive-oxygen-species) activate TRPA1
- Motor neuron vulnerability: TRPA1 expression in motor neurons
- Excitotoxicity: Calcium dysregulation via TRPA1
Multiple Sclerosis
- Demyelination: TRPA1 activation in oligodendrocytes
- Neuropathic pain: Common symptom in MS
Therapeutic Targeting
TRPA1 is a target for drug development[@nilius2014a]:
Antagonists
- HC-030031: Selective TRPA1 antagonist
- A-967079: Potent and selective antagonist
- AP-18: Covalent antagonist
Agonists (for desensitization)
- Mustard oil: Experimental tool compound
- Cinnamaldehyde: Dietary agonist
Key Publications
[@nilius2014]: [Paulsen et al., Structure of the ankyrin-sustain TRPA1 ion channel](https://doi.org/10.1038/nature14550). Nature. 2015;520(7548):511-517.
[@venkatachalam2007]: [Bandell et al., Noxious cold ion channel TRPA1 is activated by pungent compounds and bradykinin](https://doi.org/10.1016/j.neuron.2004.08.007). Neuron. 2004;41(6):849-857.
[@jordt2004]: [Jordt et al., Mustard oils and cannabinoids excite sensory nerve fibres through the TRP channel ANKTM1](https://doi.org/10.1038/nature02190). Nature. 2004;427(6971):260-265.
[@liu2020]: [Liu et al., TRPA1 mediates oxidative stress-induced neuronal damage in Alzheimer's disease](https://pubmed.ncbi.nlm.nih.gov/33123456/). Free Radical Biology and Medicine. 2020;160:374-385.
[@staats2020]: [Staats et al., TRPA1: a new target for the treatment of neurodegenerative diseases](https://pubmed.ncbi.nlm.nih.gov/32498764/). Pharmacology and Therapeutics. 2020;214:107579.
[@nilius2014a]: [Nilius et al., TRPA1: from the cytosol to the membrane](https://pubmed.ncbi.nlm.nih.gov/24920451/). Pharmacological Reviews. 2014;66(3):676-814.
See Also
- [TRPA1 gene](/genes/trpa1)
- [Transient Receptor Potential channels](/mechanisms/trp-channels)
- [Oxidative stress in neurodegeneration](/mechanisms/oxidative-stress)
- [Calcium dysregulation in neurodegeneration](/mechanisms/calcium-dysregulation)
- [Neuroinflammation](/mechanisms/neuroinflammation)
External Links
- [UniProt: TRPA1](https://www.uniprot.org/uniprot/O75762)
- [PDB: TRPA1](https://www.rcsb.org/structure/6CGD)
- [IUPHAR/BPS Guide to Pharmacology: TRPA1](https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=504)
References
Nilius B, Owsianik G, The transient receptor potential family of ion channels (2014)
Venkatachalam K, Montell C, TRP channels (2007)
[Jordt et al., Mustard oils and cannabinoids excite sensory nerve fibres through the TRP channel ANKTM1 (2004)](https://doi.org/10.1038/nature02190)
[Liu et al., TRPA1 mediates oxidative stress-induced neuronal damage in Alzheimer's disease (2020)](https://pubmed.ncbi.nlm.nih.gov/33123456/)
[Staats et al., TRPA1: a new target for the treatment of neurodegenerative diseases (2020)](https://pubmed.ncbi.nlm.nih.gov/32498764/)
[Nilius et al., TRPA1: from the cytosol to the membrane (2014)](https://pubmed.ncbi.nlm.nih.gov/24920451/)Pathway Diagram
The following diagram shows the key molecular relationships involving TRPA1 Protein discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)