TRPM3 Gene - Transient Receptor Potential Channel

TRPM3 Gene - Transient Receptor Potential Channel

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPM3 — Transient Receptor Potential Cation Channel Subfamily M Member 3</th>
</tr>
<tr> [@lam2022]
<td class="label">Symbol</td> [@vriens2021]
<td><strong>TRPM3</strong></td> [@chen2020]
</tr> [@broman2021]
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily M Member 3</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>9q21.11</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/80084" target="_blank">80084</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000083099" target="_blank">ENSG00000083099</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/608394" target="_blank">608394</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9BQY4" target="_blank">Q9BQY4</a></td>
</tr>
<tr>
<td class="label">Protein</td>
<td>TRPM3 (Melastatin-3)</td>
</tr>
<tr>
<td class="label">Channel Type</td>
<td>Calcium-permeable nonselective cation channel</td>
</tr>
<tr>
<td class="label">Brain Expression</td>
<td>Cortex, Hippocampus, Thalamus, Hypothalamus</td>
</tr>
<tr>
<td class="label">Family</td>
<td>TRPM (Transient Receptor Potential Melastatin)</td>
</tr>
<tr>
<td class="label"> li

TRPM3 Gene - Transient Receptor Potential Channel

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPM3 — Transient Receptor Potential Cation Channel Subfamily M Member 3</th>
</tr>
<tr> [@lam2022]
<td class="label">Symbol</td> [@vriens2021]
<td><strong>TRPM3</strong></td> [@chen2020]
</tr> [@broman2021]
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily M Member 3</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>9q21.11</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/80084" target="_blank">80084</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000083099" target="_blank">ENSG00000083099</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/608394" target="_blank">608394</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9BQY4" target="_blank">Q9BQY4</a></td>
</tr>
<tr>
<td class="label">Protein</td>
<td>TRPM3 (Melastatin-3)</td>
</tr>
<tr>
<td class="label">Channel Type</td>
<td>Calcium-permeable nonselective cation channel</td>
</tr>
<tr>
<td class="label">Brain Expression</td>
<td>Cortex, Hippocampus, Thalamus, Hypothalamus</td>
</tr>
<tr>
<td class="label">Family</td>
<td>TRPM (Transient Receptor Potential Melastatin)</td>
</tr>
<tr>
<td class="label"> ligands</td>
<td>Heat, Psychosine, Mechanical stimuli</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/migraine" style="color:#ef9a9a">Migraine</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">9 edges</a></td>
</tr>
</table>

TRPM3 — Transient Receptor Potential Cation Channel Subfamily M Member 3

Introduction

TRPM3 (Transient Receptor Potential Cation Channel Subfamily M Member 3) encodes a calcium-permeable nonselective cation channel belonging to the TRPM (Transient Receptor Potential Melastatin) family. TRPM3 is expressed throughout the brain, particularly in the [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), thalamus, and hypothalamus, where it plays critical roles in neuronal excitability, hormone secretion, and cell survival. As a thermosensitive and mechanosensitive channel, TRPM3 contributes to various physiological processes and has emerged as a player in neurodegenerative diseases through its involvement in calcium homeostasis dysregulation.

Overview

TRPM3 is a member of the TRPM subfamily of non-selective cation channels characterized by their involvement in sensory transduction. The channel is widely expressed in the central nervous system, with particularly high expression in regions involved in temperature sensation and endocrine function. TRPM3 can be activated by multiple stimuli including heat (temperatures above 35°C), mechanical stretch, and endogenous ligands such as psychosine and sphingosine. Dysregulation of TRPM3 has been implicated in Alzheimer disease, Parkinson disease, and epilepsy, making it a subject of interest for understanding neurodegeneration mechanisms.

Channel Structure and Function

Protein Architecture

TRPM3 is a tetrameric ion channel, with each subunit consisting of:

• N-terminal MHR domains (Melastatin Homology Regions): Multiple protein-protein interaction domains that regulate channel assembly and function
• Six transmembrane segments (S1-S6): Form the pore loop between S5 and S6, allowing ion conduction
• C-terminal regulatory domain: Contains binding sites for modulators and contributes to channel gating

Ion Permeability

TRPM3 exhibits relatively non-selective permeability to cations, with permeability ratios:

• Ca²⁺: High permeability (PCa/PNa ≈ 2-3)
• Na⁺: Moderate permeability
• Mg²⁺: Moderate permeability
• K⁺: Lower permeability

Activation Mechanisms

TRPM3 can be activated through multiple mechanisms:

Expression in the Brain

TRPM3 exhibits region-specific expression throughout the brain:

| Brain Region | Expression Level | Functional Significance |
|--------------|------------------|------------------------|
| Cerebral Cortex | High | Neuronal excitability, cortical processing |
| Hippocampus | High | Synaptic plasticity, memory formation |
| Thalamus | Moderate-High | Sensory relay, arousal regulation |
| Hypothalamus | High | Neuroendocrine control, thermoregulation |
| Cerebellum | Moderate | Motor coordination |
| Substantia Nigra | Moderate | Dopaminergic neuron function |

Role in Neurodegeneration

Alzheimer Disease

TRPM3 is significantly upregulated in [Alzheimer disease](/diseases/alzheimers-disease) brains, particularly in regions vulnerable to amyloid pathology including the hippocampus and [entorhinal cortex](/brain-regions/entorhinal-cortex). The channel's dysregulation contributes to:

• Calcium dyshomeostasis: Enhanced TRPM3 activity leads to increased intracellular Ca²⁺, disrupting neuronal calcium signaling critical for synaptic function and survival
• [Amyloid-beta](/proteins/amyloid-beta) toxicity: Studies suggest TRPM3 may mediate or exacerbate [amyloid-beta](/proteins/amyloid-beta-protein)-induced cytotoxicity through calcium overload
• Neuronal hyperexcitability: Altered TRPM3 function may contribute to the network hyperexcitability observed in early AD
• Neuroinflammation: TRPM3 activation can trigger inflammatory responses in glial cells, potentially amplifying neuroinflammation

Parkinson Disease

In [Parkinson disease](/diseases/parkinsons-disease), TRPM3 plays a complex role in dopaminergic neuron survival:

• Psychosine activation: The endogenous ligand psychosine, which accumulates in PD brains, activates TRPM3, potentially leading to calcium dysregulation in dopaminergic [neurons](/entities/neurons)
• Oxidative stress: TRPM3-mediated calcium influx may sensitize neurons to oxidative damage
• Alpha-synuclein pathology: Evidence suggests interactions between TRPM3 dysfunction and [alpha-synuclein](/proteins/alpha-synuclein) aggregation

Epilepsy

TRPM3 gain-of-function mutations cause hereditary epilepsy in both humans and mouse models. The channel's role in epilepsy includes:

• Neuronal hyperexcitability: Increased TRPM3 activity lowers the threshold for seizure generation
• Dysregulated calcium signaling: Altered calcium homeostasis contributes to epileptogenesis

Signal Transduction Pathways

TRPM3 interacts with several key signaling pathways:

Therapeutic Implications

TRPM3 represents a potential therapeutic target for neurodegenerative diseases:

Drug Development

• TRPM3 antagonists: Several compounds have been developed to block TRPM3 activity, showing promise in preclinical models of epilepsy
• Modulator selectivity: Challenges remain in developing selective TRPM3 modulators due to similarities with other TRP channel family members

Clinical Relevance

• Epilepsy treatment: TRPM3 inhibitors may offer novel approaches for treating TRPM3-associated epilepsy
• Neuroprotection: Modulating TRPM3 activity could provide neuroprotective effects in AD and PD by preventing calcium overload

Animal Models

Mouse models have been instrumental in understanding TRPM3 function:

• TRPM3 knockout mice: Exhibit thermal anesthesia, reduced seizure threshold, and metabolic abnormalities
• TRPM3 mutant mice: Gain-of-function mutations cause spontaneous epilepsy
• Transgenic models: Overexpression models used to study TRPM3 upregulation in neurodegeneration

Cellular and Molecular Mechanisms

Calcium Signaling

TRPM3 is a non-selective calcium-permeable cation channel:

Channel Gating

TRPM3 is activated by multiple mechanisms:

• Chemical agonists: Menthol, pregnenolone sulfate
• Temperature: Heat activation (>35°C)
• Voltage dependence: Voltage-dependent activation
• Phosphorylation: PKC-mediated modulation

Signaling Pathways

TRPM3 interacts with several cellular pathways:

| Pathway | Interaction | Outcome |
|---------|-------------|---------|
| Calmodulin | Calcium binding | Channel regulation |
| PKC | Phosphorylation | Altered gating |
| CaMKII | Calcium-dependent activation | Synaptic plasticity |
| NFAT | Calcium signaling | Gene transcription |
| MAPK | Cell stress pathways | Apoptosis |

Therapeutic Implications

Drug Development

TRPM3 is a promising drug target:

Clinical Applications

• Epilepsy: TRPM3 inhibitors as novel antiseizure drugs
• Alzheimer's disease: Blocking TRPM3-mediated calcium dysregulation
• Parkinson's disease: Preventing psychosine-induced dopaminergic death
• Pain: TRPM3 in nociception and pain signaling

Research Methods

Key approaches for studying TRPM3:

• Electrophysiology: Patch-clamp recordings in neurons
• Calcium imaging: Fluorescent calcium indicators
• Molecular biology: siRNA knockdown, CRISPR editing
• Animal models: Knockout and transgenic mice
• Human tissue: Postmortem brain analysis

Additional References

Key Publications

Background

The study of TRPM3 has evolved significantly since its identification as a member of the TRPM family. Initially characterized as a thermosensitive channel, subsequent research revealed its broader roles in sensory transduction, endocrine function, and more recently, neurodegeneration. The channel's involvement in calcium dysregulation—a hallmark of neurodegenerative processes—has positioned it as a molecule of interest for understanding disease mechanisms and developing therapeutic interventions.

Historical milestones include the discovery of TRPM3 mutations causing epilepsy, demonstration of its upregulation in AD brain tissue, and identification of psychosine as an endogenous activator relevant to PD. Ongoing research continues to elucidate the complex interactions between TRPM3 and neurodegenerative disease processes.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/?term=TRPM3+channel+neurodegeneration) - Biomedical literature
• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/80084) - Gene database entry
• [UniProt](https://www.uniprot.org/uniprot/Q9BQY4) - Protein database entry
• [Allen Brain Atlas](https://human.brain-map.org/) - Brain gene expression data

See Also

• [TRPM3 Protein](/proteins/trpm3-protein)
• [Ion Channels in Neurodegeneration](/mechanisms/ion-channel-dysfunction)
• Calcium Dysregulation in Alzheimer's Disease
• Parkinson Disease Mechanisms
• TRP Channel Family

References

Pathway Diagram

The following diagram shows the key molecular relationships involving TRPM3 Gene - Transient Receptor Potential Channel discovered through SciDEX knowledge graph analysis:

Disease Associations

Source: Open Targets Platform (opentargets.org)

| Disease | Association Score | Disease ID |
|--------|-------------------|------------|
| neurodevelopmental disorder with hypotonia, dysmorphic facies, and skeletal anomalies, with or without seizures | 0.6306 | MONDO_0859365 |
| cataract 50 with or without glaucoma | 0.5226 | MONDO_0859382 |
| autosomal dominant non-syndromic intellectual disability | 0.4546 | MONDO_0015802 |
| restless legs syndrome | 0.4370 | EFO_0004270 |
| Abnormality of the skeletal system | 0.4196 | HP_0000924 |