Chemokine Signaling in Osteoclast Biology

Chemokines are small secreted proteins that orchestrate the localisation, homing and activation of immune and skeletal cells through specific G protein-coupled receptors. In bone, they regulate the differentiation of monocyte-derived precursors into multinucleated osteoclasts, fine-tuning bone resorption in concert with osteoblastic bone formation. The balance of CC and CXC chemokine subfamilies, acting in autocrine and paracrine loops, influences osteoclastogenesis via pathways such as RANKL-mediated NF-κB activation and MAPK signalling. Chemokine axes also modulate podosomal organisation, cytoskeletal dynamics and survival signals in mature osteoclasts, while inflammatory milieus elevate chemokine expression to exacerbate pathological bone loss in osteoporosis and arthritis. Emerging evidence highlights the systemic and local roles of chemokine networks in skeletal homeostasis and suggests that selective receptor blockade or ligand neutralisation may offer therapeutic avenues to prevent excessive bone resorption and support bone regeneration.

Research from Nature Portfolio

Recent studies have demonstrated that the stromal cell-derived factor-1 (SDF-1)/CXCR4 axis critically regulates osteoclast precursor recruitment and differentiation during alveolar bone remodelling, and that local neutralisation of SDF-1 reduces osteoclast accumulation and inflammatory markers in a tooth-movement model. Foundational work on the HIV co-receptor CCR5 has shown that CCR5 deficiency impairs podosome organisation and bone-resorption activity of osteoclasts, conferring resistance to RANKL-induced osteoporosis independently of immune modulation. In inflammatory bone lesions, osteoblastic expression of eotaxin-1 (CCL11) engages CCR3 on osteoclasts to enhance their migration and resorptive capacity, identifying a novel axis in chronic inflammatory bone resorption.

Chemokine Signaling in Osteoclast Biology publication trend

The graph below shows the total number of articles in chemokine signaling in osteoclast biology across all publications each year (not limited to Nature Index journals).

Technical terms

Chemokine: Small secreted proteins that guide migration of immune and bone cells by binding to specific G protein-coupled receptors.

Osteoclast: Multinucleated bone-resorbing cell derived from monocyte/macrophage lineage responsible for matrix degradation.

Osteoclastogenesis: Differentiation process by which monocyte precursors fuse and mature into functional osteoclasts under signalling cues such as RANKL.

SDF-1 (CXCL12): A CXC chemokine ligand that engages CXCR4 to regulate cell migration and survival within the bone microenvironment.

CXCR4: A G protein-coupled receptor for SDF-1 that orchestrates osteoclast precursor homing and mature osteoclast function.

CCR5: A chemokine receptor involved in osteoclast motility and resorptive activity through cytoskeletal and adhesion complex regulation.

References

1. The MCP-3/Ccr3 axis contributes to increased bone mass by affecting osteoblast and osteoclast differentiation. Experimental & Molecular Medicine (2024).
2. CCL3 in bone marrow microenvironment causes bone loss and bone marrow adiposity in aged mice. JCI Insight (2023).
3. Effects of circulating inflammatory proteins on osteoporosis and fractures: evidence from genetic correlation and Mendelian randomization study. Frontiers in Endocrinology (2024).
4. SDF-1 involvement in orthodontic tooth movement after tooth extraction. Scientific Reports (2024).
5. The HIV co-receptor CCR5 regulates osteoclast function. Nature Communications (2017).
6. CCL11, a novel mediator of inflammatory bone resorption. Scientific Reports (2017).
7. Chemokines in Physiological and Pathological Bone Remodeling. Frontiers in Immunology (2019).