SCN10A Protein (Nav1.8)

SCN10A Protein (Nav1.8)

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">SCN10A Protein (Nav1.8)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>SCN10A</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>SCN10A (Nav1.8)</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=SCN10A" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Nav1.8 is a tetrodotoxin-resistant voltage-gated sodium-channel alpha subunit encoded by [SCN10A](/proteins/scn10a-protein). It is strongly associated with peripheral nociceptor excitability and sustained pain signaling, especially under inflammatory and neuropathic conditions.[@akopian1999][@zimmermann2007][@han2016] Relative to several other Nav channels, Nav1.8 contributes disproportionately to repetitive firing in C-fiber pathways, making it a persistent focus for non-opioid analgesic discovery.[@zimmermann2007][@xie2025]

Although mainly studied in pain biology, SCN10A/Nav1.8 has broader translational relevance through links to autonomic and cardiac conduction phenotypes and through overlap with peripheral-neuropathy burdens in neurodegenerative cohorts.[@chambers2010][@macri2018]

Molecular Architecture And Biophysics

SCN10A Protein (Nav1.8)

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">SCN10A Protein (Nav1.8)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>SCN10A</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>SCN10A (Nav1.8)</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=SCN10A" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Nav1.8 is a tetrodotoxin-resistant voltage-gated sodium-channel alpha subunit encoded by [SCN10A](/proteins/scn10a-protein). It is strongly associated with peripheral nociceptor excitability and sustained pain signaling, especially under inflammatory and neuropathic conditions.[@akopian1999][@zimmermann2007][@han2016] Relative to several other Nav channels, Nav1.8 contributes disproportionately to repetitive firing in C-fiber pathways, making it a persistent focus for non-opioid analgesic discovery.[@zimmermann2007][@xie2025]

Although mainly studied in pain biology, SCN10A/Nav1.8 has broader translational relevance through links to autonomic and cardiac conduction phenotypes and through overlap with peripheral-neuropathy burdens in neurodegenerative cohorts.[@chambers2010][@macri2018]

Molecular Architecture And Biophysics

Nav1.8 follows the canonical Nav alpha-subunit topology (DI-DIV, each with S1-S6 helices), but functionally is distinguished by tetrodotoxin resistance and kinetic properties that support ongoing spiking during prolonged depolarization.[@akopian1999][@zimmermann2007]

Important operational features include:

• Persistent contribution to nociceptor firing during sustained stimuli.
• Strong involvement in cold and inflammatory pain phenotypes.
• Sensitivity to trafficking regulation, which can shift membrane availability and pain behavior.[@zimmermann2007][@xie2025]

Physiologic Role

In peripheral sensory [neurons](/entities/neurons), Nav1.8 supports:

• Action-potential generation in small-diameter nociceptors.
• High-frequency firing under inflammatory drive.
• Integration of noxious mechanical/thermal input into durable pain signaling.[@zimmermann2007][@han2016]

Disease Relevance

Pain disorders

Nav1.8 is implicated across chronic pain domains, including inflammatory pain, neuropathic pain phenotypes, and inherited pain-channel syndromes where SCN10A variants co-occur with other sodium-channel risk backgrounds.[@han2016][@stewart2025][@xue2021]

Cardiac conduction associations

Independent of nociception, common and rare SCN10A variants have been associated with cardiac conduction traits and arrhythmia susceptibility in population and mechanistic studies.[@chambers2010][@macri2018] This dual-domain biology is a key translational constraint when developing systemic Nav1.8 inhibitors.

Relevance to neurodegeneration-facing care pathways

For neurodegeneration programs, Nav1.8 is best framed as a symptomatic-mechanistic target (pain and sensory burden) rather than a core disease-modifying target in primary proteinopathy mechanisms. It remains clinically important for quality-of-life outcomes and multimorbidity management in long-duration disease trajectories.[@xie2025][@xue2021]

Therapeutic Targeting

Interest in Nav1.8 has accelerated with recent highly selective inhibitor programs, including human-neuron translational studies on suzetrigine-like pharmacology.[@stewart2025] Core strategic goals are:

• High Nav1.8 selectivity over other Nav isoforms.
• Peripheral activity profiles that preserve CNS safety.
• Trial endpoints that separate acute analgesia from chronic disease modification.[@xie2025][@stewart2025][@xue2021]

Translational Notes For Evidence Scoring

Within the NeuroWiki rubric framework:

• Mechanistic clarity: strong for nociceptor physiology.
• Clinical evidence: growing, strongest for pain outcomes.
• Disease modification in neurodegeneration: currently low to exploratory.

See Also

• [SCN10A Gene](/proteins/scn10a-protein)](/proteins)
• [SCN9A Gene](/proteins/scn9a-protein)](/proteins)
• [Neuropathic Pain](/diseases/neuropathic-pain)
• [Peripheral Neuropathy](/diseases/peripheral-neuropathy)

External Links

• [UniProt (SCN10A/Nav1.8)](https://www.uniprot.org/uniprot/Q9Y5Y9)
• [NCBI Gene: SCN10A](https://www.ncbi.nlm.nih.gov/gene/6336)
• [Guide to Pharmacology: Nav1.8](https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=636)

References