RANKL (Receptor Activator of Nuclear Factor Kappa-B Ligand), also known as TNFSF11 or TRANCE, is a cytokine that belongs to the tumor necrosis factor superfamily. It plays essential roles in bone metabolism, immune system regulation, and has been implicated in neuroinflammatory processes underlying neurodegenerative diseases.
Gene Overview
<div class="infobox infobox-gene"> | Property | Value | |----------|-------| | Gene Symbol | RANKL (TNFSF11) | | Full Name | Tumor Necrosis Factor Ligand Superfamily Member 11 | | Chromosomal Location | 13q14 | | NCBI Gene ID | 9600 | | OMIM | 602642 | | Ensembl | ENSG00000120659 | | UniProt | O14788 | | Associated Diseases | Osteoporosis, rheumatoid arthritis, bone metastasis, neuroinflammation | </div>
Overview
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RANKL (TNFSF11)
RANKL (Receptor Activator of Nuclear Factor Kappa-B Ligand), also known as TNFSF11 or TRANCE, is a cytokine that belongs to the tumor necrosis factor superfamily. It plays essential roles in bone metabolism, immune system regulation, and has been implicated in neuroinflammatory processes underlying neurodegenerative diseases.
Gene Overview
<div class="infobox infobox-gene"> | Property | Value | |----------|-------| | Gene Symbol | RANKL (TNFSF11) | | Full Name | Tumor Necrosis Factor Ligand Superfamily Member 11 | | Chromosomal Location | 13q14 | | NCBI Gene ID | 9600 | | OMIM | 602642 | | Ensembl | ENSG00000120659 | | UniProt | O14788 | | Associated Diseases | Osteoporosis, rheumatoid arthritis, bone metastasis, neuroinflammation | </div>
Overview
Mermaid diagram (expand to render)
RANKL is a human gene whose product rANKL is a type II transmembrane protein that can exist in both membrane-bound and soluble forms["@lacey1998"]. It functions as the primary regulator of osteoclastogenesis and modulates immune responses:. Variants in RANKL have been implicated in Neurodegeneration, Musculoskeletal, Cancer. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration.
Normal Function
RANKL is a type II transmembrane protein that can exist in both membrane-bound and soluble forms[@lacey1998]. It functions as the primary regulator of osteoclastogenesis and modulates immune responses:
Bone Metabolism
Osteoclast Formation: RANKL binds to RANK on osteoclast precursors, triggering the [NF-κB](/entities/nf-kb), c-Fos, and NFATc1 signaling cascades that drive differentiation into mature osteoclasts[@kong1999]
Bone Remodeling: The RANKL/OPG ratio determines bone resorption rates
Pathological Bone Loss: Elevated RANKL contributes to conditions like osteoporosis and rheumatoid arthritis
Immune Regulation
T Cell Co-stimulation: RANKL provides critical co-stimulatory signals for T cell activation and survival[@josien1999]
Dendritic Cell Function: Promotes dendritic cell survival and migration
Lymphoid Organogenesis: Essential for formation of lymph nodes and medullary thymic epithelial cells
CNS Functions
Microglial Activation: Soluble RANKL can activate [microglia](/cell-types/microglia-neuroinflammation), promoting production of pro-inflammatory cytokines
Synaptic Plasticity: Emerging evidence suggests RANKL may modulate synaptic function
[Blood-Brain Barrier](/entities/blood-brain-barrier): RANKL may influence BBB permeability during inflammation
Disease Associations
Neurodegeneration
Alzheimer's Disease: Elevated RANKL levels in CSF and brain tissue correlate with disease progression. RANKL promotes microglial activation and neuroinflammation[@liu2022]
Parkinson's Disease: RANKL may contribute to dopaminergic neuron loss through neuroinflammation
Multiple Sclerosis: RANKL drives inflammatory bone erosion and CNS demyelination
ALS: Altered RANKL signaling observed in ALS patients
Musculoskeletal
Osteoporosis: High RANKL/OPG ratio leads to excessive bone resorption
Rheumatoid Arthritis: Synovial fibroblasts produce RANKL, driving bone erosion
Cancer
Bone Metastases: Tumor cells often express RANKL to promote osteolysis and metastasis
Multiple Myeloma: Malignant plasma cells hijack RANKL for survival
Expression Pattern
RANKL is expressed in various tissues:
High Expression: Lymph nodes, thymus, bone marrow, spleen
[Lacey DL, Timms E, Tan HL, et al, Osteoprotegerin ligand is a cytokine that regulates osteoclast differentiation and activation (1998)](https://pubmed.ncbi.nlm.nih.gov/9568710/)
[Kong YY, Yoshida H, Sarosi I, et al, OPGL is a key regulator of osteoclastogenesis, lymphocyte development and lymph-node organogenesis (1999)](https://pubmed.ncbi.nlm.nih.gov/9950424/)
Josien R, Wong BR, Li HL, Steinman RM, Choi Y, TRANCE, a TNF family member, is differentially expressed on T cell subsets and induces dendritic cell maturation (1999)
[Liu CC, Hu J, Tsai CW, et al, Microglial RANK contributes to neuronal damage in Alzheimer's disease (2022)](https://doi.org/10.1038/s41593-022-01023-7)
Pathway Diagram
The following diagram shows the key molecular relationships involving RANKL (TNFSF11) discovered through SciDEX knowledge graph analysis: