RANK (TNFRSF11A)

RANK (TNFRSF11A)

RANK (Receptor Activator of Nuclear Factor Kappa-B), also known as TNFRSF11A, is a member of the tumor necrosis factor receptor superfamily that plays critical roles in bone metabolism, immune cell activation, and has emerging implications in neurodegenerative diseases.

Pathway Diagram

RANK (TNFRSF11A)

RANK (Receptor Activator of Nuclear Factor Kappa-B), also known as TNFRSF11A, is a member of the tumor necrosis factor receptor superfamily that plays critical roles in bone metabolism, immune cell activation, and has emerging implications in neurodegenerative diseases.

Pathway Diagram

Gene Overview

<div class="infobox infobox-gene">
| Property | Value |
|----------|-------|
| Gene Symbol | RANK (TNFRSF11A) |
| Full Name | TNF Receptor Superfamily Member 11A |
| Chromosomal Location | 18q21.33 |
| NCBI Gene ID | 26986 |
| OMIM | 603799 |
| Ensembl | ENSG00000141655 |
| UniProt | Q9Y275 |
| Associated Diseases | Osteoclastogenesis, Paget's disease, bone metastasis, rheumatoid arthritis, neuroinflammation |
</div>

Overview

RANK is a human gene whose product rANK is a type I transmembrane protein expressed primarily on osteoclast precursors, dendritic cells, and activated T cells[@anderson1997]. It serves as the receptor for RANKL (RANK ligand) and plays essential roles in:. Variants in RANK have been implicated in Neurodegeneration, Inflammatory Conditions, Cancer. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration.

Normal Function

RANK is a type I transmembrane protein expressed primarily on osteoclast precursors, dendritic cells, and activated T cells[@anderson1997]. It serves as the receptor for RANKL (RANK ligand) and plays essential roles in:

Bone Metabolism

• Osteoclast Differentiation: RANKL binding activates [NF-κB](/entities/nf-kb), c-Fos, and NFATc1 signaling cascades that drive osteoclast precursor cells to mature, functional osteoclasts[@hsu1999]
• Bone Remodeling: The RANK/RANKL/OPG axis is the primary regulator of bone resorption and formation balance
• Calcium Homeostasis: Through osteoclast activity, RANK signaling indirectly regulates serum calcium levels

Immune System

• Dendritic Cell Survival: RANK signaling promotes dendritic cell survival and maturation, essential for antigen presentation[@josien1999]
• T Cell Activation: RANK on T cells provides co-stimulatory signals for activation
• Lymph Node Organogenesis: RANK is required for proper lymph node development

CNS Functions

• Microglial Activation: RANK is expressed on [microglia](/cell-types/microglia-neuroinflammation) and participates in neuroinflammatory responses
• Neuronal Survival: Emerging evidence suggests RANK signaling may influence neuronal survival pathways

Disease Associations

Neurodegeneration

• Alzheimer's Disease: RANK-mediated microglial activation contributes to chronic neuroinflammation in AD brains. RANKL can induce pro-inflammatory cytokine production from microglia[@wu2020]
• Parkinson's Disease: The RANK/RANKL system may modulate neuroinflammation in PD pathogenesis
• Amyotrophic Lateral Sclerosis: Altered RANK expression has been observed in ALS models

Inflammatory Conditions

• Rheumatoid Arthritis: Hyperactive RANK signaling drives excessive bone erosion
• Inflammatory Bowel Disease: RANK contributes to intestinal inflammation

Cancer

• Bone Metastases: Many cancers exploit RANK signaling for bone metastasis
• Multiple Myeloma: RANK is critical for myeloma cell survival in bone marrow

Expression Pattern

RANK shows tissue-specific expression:

• High Expression: Bone marrow, lymph nodes, spleen, thymus
• Moderate Expression: Liver, heart, skeletal muscle
• Low/Restricted Expression: Brain ([neurons](/entities/neurons), microglia), spinal cord

Common Variants

| Variant | Function | Associated Phenotype |
|---------|----------|---------------------|
| A133V | Reduced signaling | Bone density variants |
| K171E | Altered ligand binding | Immunodeficiency |

Therapeutic Implications

Drug Targets

• Denosumab: Anti-RANKL antibody that blocks RANK activation (used for osteoporosis)
• OPG (Osteoprotegerin): Decoy receptor that competitively inhibits RANKL

Research Directions

• Modulating RANK signaling to reduce neuroinflammation
• Targeting RANK in microglia to slow neurodegeneration
• Understanding RANK's role in [blood-brain barrier](/entities/blood-brain-barrier) integrity

Cross-Links

• [RANKL (TNFSF11)](/genes/rankl) - Ligand
• [TREM2](/genes/trem2) - Microglial receptor
• [NF-κB](/mechanisms/nf-kappa-b) - Signaling pathway
• [Microglia](/cell-types/microglia) - CNS expression
• [Neuroinflammation](/mechanisms/neuroinflammation) - Disease mechanism

See Also

• [NF-κB](/mechanisms/nf-kappa-b)
• [Neuroinflammation](/mechanisms/neuroinflammation)

External Links

• [Ensembl: ENSG00000141655](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000141655)
• [NCBI Gene: RANK](https://www.ncbi.nlm.nih.gov/gene/?term=RANK)
• [GeneCards: RANK](https://www.genecards.org/cgi-bin/carddisp.pl?gene=RANK)
• [OMIM: RANK](https://omim.org/search?search=RANK)
• [Allen Brain Atlas: RANK](https://human.brain-map.org/microarray/search/show?search_term=RANK)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving RANK (TNFRSF11A) discovered through SciDEX knowledge graph analysis: