TRPV6

TRPV6

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPV6</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>TRPV6</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily V Member 6</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2q37</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>9903</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000165283</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9H1D0</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>725 amino acids</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ion channel, TRPV family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

TRPV6

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPV6</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>TRPV6</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily V Member 6</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2q37</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>9903</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000165283</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9H1D0</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>725 amino acids</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ion channel, TRPV family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

TRPV6 (Transient Receptor Potential Cation Channel Subfamily V Member 6), originally discovered as CaT1 (Calcium Transporter 1), encodes a highly calcium-selective ion channel that serves as the primary pathway for calcium absorption in the intestinal epithelium[@peng2000b]. TRPV6 belongs to the TRPV (Vanilloid) subfamily and is distinguished by its exceptional calcium selectivity, even exceeding that of the related channel TRPV5. Beyond its well-characterized role in epithelial calcium transport, TRPV6 is increasingly recognized for its functions in the central nervous system, where it contributes to neuronal calcium homeostasis, synaptic plasticity, and responses to neurodegenerative stimuli.

TRPV6 is expressed throughout the brain in regions including the [hippocampus](/brain-regions/hippocampus), [cerebral cortex](/brain-regions/cortex), and [basal ganglia](/brain-regions/basal-ganglia), where it participates in calcium-dependent signaling relevant to Alzheimer's disease (AD), Parkinson's disease (PD), and other neurodegenerative conditions[@maiar2014][@jo2019]. The channel's expression in non-neuronal cells including microglia and astrocytes further suggests roles in neuroinflammation and glial function[@liu2016].

Gene Information

Molecular Structure and Selectivity

High Calcium Selectivity

TRPV6 displays the highest calcium selectivity among TRP channels, with a permeability ratio (P_Ca/P_Na) exceeding 100:1[@choi2001]. This exceptional selectivity is achieved through:

Structural Features

TRPV6 shares the overall architecture of TRPV channels:

• Ankyrin repeat domain (ARD): Six ankyrin repeats at the N-terminus for protein interactions
• Transmembrane domain: Six transmembrane segments (S1-S6) with a pore-forming loop between S5 and S6
• TRP domain: Conserved TRP box motif in the C-terminus involved in gating

Expression in the Brain

Neuronal Expression

TRPV6 is expressed in multiple neuronal populations throughout the brain[@boehmer2008]:

• Hippocampus: High expression in CA1-CA3 pyramidal neurons and dentate gyrus granule cells
• Cerebral cortex: Expressed in pyramidal neurons across cortical layers
• Basal ganglia: Detected in striatal medium spiny neurons and substantia nigra dopaminergic neurons
• Cerebellum: Present in Purkinje cells

Glial Expression

TRPV6 is also present in non-neuronal cells of the nervous system[@liu2016]:

• Microglia: TRPV6 is expressed in microglial cells where it regulates inflammatory responses
• Astrocytes: Detected in astrocytic cells with upregulation during reactive gliosis

Role in Neuronal Physiology

Calcium Homeostasis

TRPV6 plays important roles in neuronal calcium regulation[@boehmer2008]:

• Calcium entry pathway: Provides a voltage-independent pathway for calcium entry
• Resting calcium: Contributes to maintenance of basal intracellular calcium levels
• Activity-dependent calcium: Mediates calcium influx during specific signaling events

Synaptic Plasticity

TRPV6 participates in activity-dependent synaptic modification:

• LTP induction: Calcium influx through TRPV6 contributes to long-term potentiation
• LTD mechanisms: Involved in calcium-dependent long-term depression

Autophagy Regulation

TRPV6 has been implicated in autophagy regulation in neurons[@song2018]:

• mTOR modulation: TRPV6 activity affects mTOR signaling
• Autophagosome formation: Regulates autophagosome biogenesis
• Protein quality control: Important for clearance of misfolded proteins

Role in Neurodegeneration

Alzheimer's Disease

TRPV6 dysfunction has been implicated in Alzheimer's disease pathogenesis[@maiar2014][@zhang2015]:

• Calcium dysregulation: Altered TRPV6 expression contributes to neuronal calcium dysregulation in AD
• Amyloid-beta effects: Aβ exposure modulates TRPV6 function and expression
• Synaptic dysfunction: Impaired TRPV6 signaling affects synaptic plasticity and memory
• Autophagy impairment: TRPV6 dysregulation may contribute to impaired autophagic flux in AD

Parkinson's Disease

In Parkinson's disease, TRPV6 shows altered expression in vulnerable brain regions[@jo2019]:

• Dopaminergic neuron survival: TRPV6 expression is altered in substantia nigra neurons
• Calcium dysregulation: Contributes to calcium dysregulation characteristic of PD
• Oxidative stress: TRPV6-mediated calcium signaling affects oxidative stress responses

Neuroinflammation

TRPV6 plays significant roles in neuroinflammatory processes[@liu2016]:

• Microglial activation: TRPV6 in microglia regulates inflammatory cytokine production
• Anti-inflammatory effects: TRPV6 activation can reduce pro-inflammatory responses

Regulation

Vitamin D Regulation

TRPV6 is transcriptionally regulated by 1,25-dihydroxyvitamin D3 (calcitriol)[@webb2001]:

• VDR-mediated: Vitamin D receptor (VDR) directly regulates TRPV6 transcription
• Calcium homeostasis: Vitamin D-dependent regulation coordinates intestinal and neuronal calcium transport

Protein Interactions

TRPV6 interacts with multiple regulatory proteins involved in calcium homeostasis.

Interacting Partners

• Calmodulin: Calcium-dependent modulation
• Annexin proteins: Membrane targeting
• VDR: Vitamin D receptor-mediated regulation
• S100A proteins: Calcium-binding interactions
• PDZ domain proteins: Scaffolding complexes

Signaling Networks

TRPV6 participates in:

Structural Biology

Pore Architecture

• Selectivity filter: Aspartate ring (D541)
• Pore loop between S5 and S6
• Gate region formed by S6 helices
• Six ankyrin repeats for regulation

Gating Mechanisms

• Calcium-dependent inactivation
• Calmodulin binding
• PIP2 sensitivity
• Weak voltage dependence

Animal Models

Knockout Studies

TRPV6 knockout mice show:

• Reduced intestinal calcium absorption
• TRPV5 compensatory upregulation
• Minimal neurological deficits

Disease Mechanisms

TRPV6 dysfunction affects:

Cellular Consequences

• Neuronal vulnerability
• Protein aggregate accumulation
• Synaptic dysfunction
• Reactive gliosis

• NCX (Na+/Ca2+ exchanger): Calcium extrusion partner
• PMCA: Plasma membrane calcium ATPase
• Annexin family: Membrane targeting and localization
• S100A10/A2: Calcium-binding protein interactions
• VDR: Transcriptional regulation

Calcium Signaling Networks

TRPV6 participates in neuronal calcium homeostasis:

Spatial aspects: TRPV6 contributes to calcium signaling in dendritic compartments.

Temporal dynamics: Channel kinetics shape calcium transients.

Network integration: Works with VGCC, NMDA receptors, and internal stores.

Vitamin D Regulation Details

The VDR-TRPV6 connection is clinically significant:

Deficiency states may affect neuronal calcium regulation.

Autophagy Connection

TRPV6 has unique role in autophagy:

• mTOR modulation: TRPV6 activity affects mTOR signaling pathway
• Autophagosome formation: Regulates autophagosome biogenesis
• Lysosomal coordination: Works with lysosomal calcium signaling
• Protein quality control: Important for aggregate clearance

Channelopathies

TRPV6 mutations are associated with:

Cancer overexpression:

• Prostate, breast, pancreatic cancers
• Diagnostic and prognostic marker
• Therapeutic target potential

• Altered expression in AD and PD
• Calcium dysregulation role
• Research ongoing

Therapeutic Targeting

TRPV6 modulators face specific challenges:

Agonists:

• Need for selective activators
• CNS penetration requirements
• Safety considerations

• Cancer therapeutic potential
• Selectivity over TRPV5
• Dosing strategies

Research Methods

Electrophysiology:

• Patch clamp techniques
• Single-channel recordings
• Biophysical characterization

• CRISPR manipulation
• Reporter assays
• Protein interaction studies

• Calcium imaging
• Live cell microscopy
• FRET sensors

Comparative Biology

TRPV6 evolutionary features:

Species conservation:

• Highly conserved across vertebrates
• Functional orthologs in all mammals
• Some species variations in regulation

• 75% amino acid sequence identity
• Different tissue expression patterns
• Can form heteromeric channels
• Similar biophysical properties

• Aspartate ring similar to TRPV5
• High calcium selectivity maintained
• Pore structure conserved

Channelopathies Details

Cancer biology:

• Overexpression in 90%+ prostate cancers
• Breast cancer prognostic marker
• Pancreatic cancer therapeutic target
• Promotes cell proliferation and survival

• Anti-apoptotic signaling
• Enhanced calcium influx
• Cell cycle progression
• Metastasis support

• Altered expression in AD models
• Changes in PD substantia nigra
• Multiple sclerosis demyelination
• Possible therapeutic target

Drug Development

Clinical development status:

• No FDA-approved TRPV6 modulators yet
• Multiple compounds in preclinical development
• Focus on oncology applications
• CNS-penetrant versions being optimized

• Selectivity over TRPV5
• Off-target effects
• Species differences
• Dosing and formulation

Preclinical Models

Cell models:

• Prostate cancer cell lines
• Neuronal culture systems
• Microglial cultures
• iPSC-derived neurons

• Knockout mice characterization
• Xenograft models
• Transgenic overexpression
• Neurological injury models

Clinical Studies

Ongoing research:

• Biomarker studies in cancer
• Expression correlation studies
• Therapeutic intervention trials
• Pharmacokinetic studies

• Personalized medicine approaches
• Combination therapies
• Diagnostic development
• Theranostic applications

Summary

TRPV6 encodes a highly calcium-selective ion channel originally characterized for its role in intestinal calcium absorption. In the brain, TRPV6 contributes to neuronal calcium homeostasis, synaptic plasticity, and autophagy regulation. Dysregulated TRPV6 function has been implicated in Alzheimer's disease, Parkinson's disease, and neuroinflammatory conditions. The channel represents a potential therapeutic target for neurodegeneration.

See Also

• [TRPV5](/genes/trpv5)
• [TRPV1](/genes/trpv1)
• [Calcium Signaling](/mechanisms/calcium-signaling-dysregulation)
• [TRP Channels](/mechanisms/trp-channels)
• [Alzheimer's Disease Mechanisms](/mechanisms/alzheimers-disease-mechanisms)
• [Parkinson's Disease Mechanisms](/mechanisms/parkinsons-disease-mechanisms)
• [Neuroinflammation](/mechanisms/neuroinflammation)