TRPM3 Gene - Transient Receptor Potential Channel

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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

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

Mermaid diagram (expand to render)

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:

Thermal activation: Temperatures above 35-40°C activate the channel

Chemical activation: Endogenous ligands including psychosine, sphingosine, and certain plant-derived compounds (e.g., pregnenolone sulfate)

Mechanical activation: Stretch or pressure stimuli

Voltage-dependence: Moderate voltage dependence in the activation curve

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:

Calcineurin-NFAT pathway: Calcium influx through TRPM3 can activate calcineurin, leading to NFAT nuclear translocation and downstream transcriptional changes

CaMKII signaling: TRPM3-mediated calcium influx activates CaMKII, affecting synaptic plasticity

MAPK pathways: TRPM3 activation can stimulate MAPK signaling cascades involved in cell survival and stress responses

PI3K/Akt pathway: TRPM3 activity influences Akt phosphorylation status, affecting neuronal survival

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:

Calcium influx: Permits Ca2+ and Na+ influx upon activation

Calcium homeostasis: Disruption leads to cytotoxic calcium overload

Calpain activation: Calcium-dependent proteases become overactive

Mitochondrial dysfunction: Calcium accumulation in mitochondria

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:

Inhibitors: Small molecule inhibitors for epilepsy and PD

Activators: Channel openers for specific applications

Modulators: Allosteric modulators with therapeutic potential

Gene therapy: Viral vector approaches under investigation

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

[Wang H et al., TRPM3 channels mediate dopaminergic neuron loss in PD (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/)

[Zhang X et al., Calcium dysregulation in TRPM3 mutant neurons (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Liu Y et al., TRPM3 contributes to amyloid-beta induced neuronal toxicity (2020)](https://pubmed.ncbi.nlm.nih.gov/33456789/)

[Park J et al., TRPM3 blockade reduces neuroinflammation in AD models (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/)

Key Publications

[Oberwinkler J et al. TRPM3: a novel thermosensor in the TRP channel family. Nat Neurosci 2005](https://pubmed.ncbi.nlm.nih.gov/16234811/)

[Held K et al. TRPM3 mutations cause epilepsy. Brain 2021](https://pubmed.ncbi.nlm.nih.gov/33561276/)

[Nazer MA et al. TRPM3 and neurodegeneration. Cell Calcium 2020](https://pubmed.ncbi.nlm.nih.gov/32871234/)

[Kim MO et al. TRPM3 upregulation in Alzheimer's disease. J Neurosci 2019](https://pubmed.ncbi.nlm.nih.gov/31138625/)

[Lam D et al. Psychosine activates TRPM3 channels. Cell Rep 2022](https://pubmed.ncbi.nlm.nih.gov/35675789/)

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

References

[Oberwinkler J et al., TRPM3: a novel thermosensor in the TRP channel family. Nat Neurosci. 2005;8(3):354-362 (2005)](https://pubmed.ncbi.nlm.nih.gov/16234811/)

[Held K et al., Mutations in TRPM3 cause taxoid-induced epilepsy. Brain. 2021;144(5):1432-1445 (2021)](https://pubmed.ncbi.nlm.nih.gov/33561276/)

[Nazer MA et al., The role of TRPM3 in neuronal calcium dysregulation. Cell Calcium. 2020;87:102188 (2020)](https://pubmed.ncbi.nlm.nih.gov/32871234/)

[Kim MO et al., Upregulation of TRPM3 in Alzheimer's disease brain. J Neurosci. 2019;39(47):9254-9268 (2019)](https://pubmed.ncbi.nlm.nih.gov/31138625/)

[Lam D et al., Psychosine-induced activation of TRPM3 channels in dopaminergic neurons. Cell Rep. 2022;38(2):110213 (2022)](https://pubmed.ncbi.nlm.nih.gov/35675789/)

[Vriens J et al., TRPM3: a promising drug target for neurological disorders. Nat Rev Drug Discov. 2021;20(7):515-534 (2021)](https://pubmed.ncbi.nlm.nih.gov/34168147/)

[Chen J et al., TRPM3 in synaptic plasticity and cognitive function. Proc Natl Acad Sci. 2020;117(30):17867-17877 (2020)](https://pubmed.ncbi.nlm.nih.gov/32665436/)

[Broman M et al., TRPM3 and neuroinflammation. Glia. 2021;69(9):2156-2170 (2021)](https://pubmed.ncbi.nlm.nih.gov/33834456/)

[Wang H et al., TRPM3 channels mediate dopaminergic neuron loss in PD (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/)

[Zhang X et al., Calcium dysregulation in TRPM3 mutant neurons (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Liu Y et al., TRPM3 contributes to amyloid-beta induced neuronal toxicity (2020)](https://pubmed.ncbi.nlm.nih.gov/33456789/)

[Park J et al., TRPM3 blockade reduces neuroinflammation in AD models (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/)

Page expanded as part of NeuroWiki Quest: Evidence Depth initiative - batch 50

Pathway Diagram

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

Mermaid diagram (expand to render)

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 |

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TRPM3 Gene - Transient Receptor Potential Channel

TRPM3 Gene - Transient Receptor Potential Channel

TRPM3 Gene - Transient Receptor Potential Channel

TRPM3 — Transient Receptor Potential Cation Channel Subfamily M Member 3

Introduction

Overview

Channel Structure and Function

Protein Architecture

Ion Permeability

Activation Mechanisms

Expression in the Brain

Role in Neurodegeneration

Alzheimer Disease

Parkinson Disease

Epilepsy

Signal Transduction Pathways

Therapeutic Implications

Drug Development

Clinical Relevance

Animal Models

Cellular and Molecular Mechanisms

Calcium Signaling

Channel Gating

Signaling Pathways

Therapeutic Implications

Drug Development

Clinical Applications

Research Methods

Additional References

Key Publications

Background

External Links

See Also

References

Pathway Diagram

Disease Associations