Abstract
Osteoclasts are multinucleated cells which contribute to bone remodeling by the erosion of the mineralized matrix. They belong to the hematopoietic cell lineage, arising from the monocyte/macrophage precursor family. Polarization and adhesion to substrate are mandatory events for bone resorption, which occurs extracellularly in an area underneath the cell, denominated resorbing lacuna. This is an acidic microenvironment in which low pH allows at the same time the dissolution of the inorganic hydroxyapatite matrix and the activity of enzymes that degrade the organic components, especially collagen. Osteoclastogenesis is subjected to regulation by the RANKL/RANK axis, which links osteoclasts to the immune system. Both exacerbated and impaired osteoclast activity are deleterious for the skeleton, with consequent perturbations of bone remodeling. In both cases, therapy is not yet satisfactory and it is urgent to identify new and specific determinants that may contribute to understand the etiology of osteoclast disorders, and that could be targeted for therapy. Specificity of treatments is an issue because many cells share common determinants that are likely to cause adverse effects when disturbed. Intense osteoclast research is in progress and is expected to led shortly to new knowledge with high translational impact.
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Abbreviations
- CAII:
-
Carbonic anhydrase II
- CLC7:
-
Chloride channel type 7
- CtpK:
-
Cathepsin K gene
- DC-STAMP:
-
Dendritic cell-specific transmembrane protein
- ERK:
-
Extracellular signal-regulated kinase
- JNK:
-
c-Jun N-terminal kinase
- MAPK:
-
Mitogen-activated protein kinase
- M-CSF:
-
Macrophage colony-stimulating factor
- MFR:
-
Macrophage fusion receptor
- MITF:
-
Microphthalmia-associated transcription factor
- MMPs:
-
Metalloproteinases
- NEMO:
-
NF-κβ essential modulator
- NF-kB:
-
Nuclear factor-kB
- OSTM1:
-
Osteopetrosis associated transmembrane protein 1
- PLEKHM1:
-
Pleckstrin homology domain containing, family M (with RUN domain) member 1
- PRELP:
-
Proline/arginine-rich end leucine-rich repeat protein
- RANK:
-
Receptor activator of NF-kappaB
- RANKL:
-
Receptor activator of NF-kappaB ligand
- RGD:
-
Amino acid sequence Arg-Gly-Asp
- S1P:
-
Sphingosine-1-phosphate
- SERM:
-
Selective estrogen receptor modulator
- SIRP:
-
Signal-regulatory-protein
- TCIRG1:
-
T-cell immune regulator 1
- TFGβ:
-
Transforming growth factor β
- TNFSF11:
-
Tumor necrosis factor ligand superfamily, member 11
- TNFRSF11A:
-
Tumor necrosis factor receptor superfamily, member 11A
- TRAcP:
-
Tartrate-resistant acid phosphatase
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Acknowledgments
The original work was supported by grants from the EC (OSTEOGENE, contract No. LSHM-CT-2003-502941), the Italian Association for Cancer Research and the Swiss Bridge Foundation.
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Teti, A. (2013). Osteoclast Determinants and Implications for Therapy. In: Choi, Y. (eds) Osteoimmunology. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5366-6_14
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DOI: https://doi.org/10.1007/978-1-4614-5366-6_14
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