VDR — Vitamin D Receptor

VDR — Vitamin D Receptor

<div class="infobox infobox-gene">
<h3>VDR</h3>
<table>
<tr><th>Full Name</th><td>Vitamin D Receptor</td></tr>
<tr><th>Gene Symbol</th><td>VDR</td></tr>
<tr><th>Chromosomal Location</th><td>12q13.11</td></tr>
<tr><th>NCBI Gene ID</th><td><a href="https://www.ncbi.nlm.nih.gov/gene/7421" target="_blank">7421</a></td></tr>
<tr><th>OMIM</th><td><a href="https://www.omim.org/entry/601769" target="_blank">601769</a></td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000111424</td></tr>
<tr><th>UniProt</th><td><a href="https://www.uniprot.org/uniprot/P11473" target="_blank">P11473</a></td></tr>
<tr><th>Protein Length</th><td>427 amino acids</td></tr>
<tr><th>Associated Diseases</th><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Multiple Sclerosis](/diseases/multiple-sclerosis)</tr>
</table>
</div>

Overview

The VDR (Vitamin D Receptor) gene encodes a nuclear receptor protein that mediates the biological effects of the active form of vitamin D (1,25-dihydroxyvitamin D3, calcitriol). VDR is a member of the nuclear receptor superfamily and functions as a ligand-dependent transcription factor, regulating gene expression through binding to vitamin D response elements (VDREs) in target gene promoters.

VDR — Vitamin D Receptor

<div class="infobox infobox-gene">
<h3>VDR</h3>
<table>
<tr><th>Full Name</th><td>Vitamin D Receptor</td></tr>
<tr><th>Gene Symbol</th><td>VDR</td></tr>
<tr><th>Chromosomal Location</th><td>12q13.11</td></tr>
<tr><th>NCBI Gene ID</th><td><a href="https://www.ncbi.nlm.nih.gov/gene/7421" target="_blank">7421</a></td></tr>
<tr><th>OMIM</th><td><a href="https://www.omim.org/entry/601769" target="_blank">601769</a></td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000111424</td></tr>
<tr><th>UniProt</th><td><a href="https://www.uniprot.org/uniprot/P11473" target="_blank">P11473</a></td></tr>
<tr><th>Protein Length</th><td>427 amino acids</td></tr>
<tr><th>Associated Diseases</th><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Multiple Sclerosis](/diseases/multiple-sclerosis)</tr>
</table>
</div>

Overview

The VDR (Vitamin D Receptor) gene encodes a nuclear receptor protein that mediates the biological effects of the active form of vitamin D (1,25-dihydroxyvitamin D3, calcitriol). VDR is a member of the nuclear receptor superfamily and functions as a ligand-dependent transcription factor, regulating gene expression through binding to vitamin D response elements (VDREs) in target gene promoters.

Beyond its classic role in calcium and phosphate homeostasis, VDR is expressed throughout the brain and has been implicated in neuroprotection, modulation of neurotrophic factors, reduction of neuroinflammation, and regulation of oxidative stress responses. Epidemiological and genetic studies have associated VDR polymorphisms with risk for Alzheimer's disease (AD), Parkinson's disease (PD), and multiple sclerosis (MS)[@vitamind2023][@vdrneuro2024].

Molecular Function

Protein Structure

The VDR protein consists of several functional domains:

| Domain | Residues | Function |
|--------|----------|-----------|
| N-terminal AF-1 domain | 1-100 | Transcriptional activation, protein-protein interactions |
| DNA-binding domain (DBD) | 101-215 | Two zinc-finger motifs, binds VDREs |
| Hinge region | 216-300 | Flexibility, nuclear localization, cofactor binding |
| Ligand-binding domain (LBD) | 301-427 | Calcitriol binding, AF-2 domain for coactivator recruitment |
| F domain | 427-427 | C-terminal transactivation domain |

Signal Transduction

VDR signaling occurs through multiple mechanisms:

Normal Function in the Brain

Neuroprotection

VDR signaling promotes neuronal survival through multiple mechanisms:

• Anti-apoptotic effects: Upregulation of Bcl-2, downregulation of pro-apoptotic proteins
• Oxidative stress reduction: Enhancement of antioxidant enzyme expression (e.g., glutathione peroxidase, superoxide dismutase)
• Calcium homeostasis: Modulation of calcium-binding proteins and channels
• Mitochondrial function: Promotion of mitochondrial biogenesis and integrity

Neurotrophic Support

VDR regulates expression of neurotrophic factors:

• BDNF (Brain-Derived Neurotrophic Factor): VDR activation increases BDNF expression in neurons and glia
• NGF (Nerve Growth Factor): Regulation of neuronal survival and differentiation
• GDNF (Glial Cell Line-Derived Neurotrophic Factor): Support of dopaminergic neuron viability

Immunomodulation

VDR has profound effects on immune cell function:

• T cells: VDR activation promotes Th2 differentiation, reduces pro-inflammatory cytokines
• Microglia: VDR modulates microglial activation, reducing pro-inflammatory mediator production
• B cells: VDR influences antibody production and autoimmunity

Role in Neurodegenerative Diseases

Alzheimer's Disease

VDR dysfunction may contribute to AD pathogenesis through several mechanisms[@some][@vitamind2023]:

Parkinson's Disease

VDR plays a protective role in dopaminergic neurons[@research][@vdrparkinson2025]:

Multiple Sclerosis

VDR variants are associated with MS susceptibility and disease course[@vdr]:

Expression Pattern

VDR is expressed throughout the brain:

| Region | Expression Level | Cell Types |
|--------|------------------|------------|
| Cortex | High | Pyramidal neurons, interneurons, astrocytes |
| Hippocampus | High | CA1-CA3 neurons, dentate gyrus granule cells |
| Substantia nigra | High | Dopaminergic neurons |
| Cerebellum | High | Purkinje cells, granule cells |
| Thalamus | Moderate | Various neuronal populations |
| White matter | Moderate | Oligodendrocytes, astrocytes |

Therapeutic Implications

Vitamin D Supplementation

Vitamin D supplementation is being explored for neurodegenerative disease prevention and treatment:

• Rationale: Corrects deficiency, enhances VDR signaling, provides neuroprotective effects
• Clinical trials: Ongoing trials in AD, PD, and MS
• Dosing considerations: Optimal serum 25(OH)D levels for neuroprotection remain unclear; 40-60 ng/mL often targeted

VDR Agonists

Selective VDR agonists (calcifediol, paricalcitol) are being investigated:

• Advantages: More selective than vitamin D supplementation, better dosing control
• Challenges: Hypercalcemia risk, optimal dosing regimens unclear

Gene Therapy Approaches

Future directions include:

• VDR gene delivery: AAV-mediated VDR expression for enhanced neuroprotection
• VDRE-targeted gene therapy: Modulating expression of VDR-regulated neuroprotective genes
• Combination approaches: VDR activation plus other neuroprotective strategies

Key Publications

See Also

• [Vitamin D and Neurodegeneration](/mechanisms/vitamin-d-signaling)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Multiple Sclerosis](/diseases/multiple-sclerosis)
• [Neuroinflammation](/mechanisms/neuroinflammation)
• [Neurotrophic Factors](/mechanisms/neurotrophic-factor-signaling)

External Links

• [NCBI Gene: VDR](https://www.ncbi.nlm.nih.gov/gene/7421)
• [UniProt: VDR](https://www.uniprot.org/uniprot/P11473)
• [OMIM: VDR](https://www.omim.org/entry/601769)
• [Ensembl: VDR](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000111424)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving vdr discovered through SciDEX knowledge graph analysis:

Pathway Diagram

The following diagram shows the key molecular relationships involving VDR — Vitamin D Receptor discovered through SciDEX knowledge graph analysis: