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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Stimulation of Notch Signaling in Mouse Osteoclast Precursors
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Signaling Pathways in Osteoclast Differentiation.

Jung Ha Kim1, Nacksung Kim1

  • 1Department of Pharmacology, Chonnam National University Medical School, Gwangju, Korea.

Chonnam Medical Journal
|February 12, 2016
PubMed
Summary

Osteoclast differentiation, crucial for bone remodeling, is regulated by macrophage colony-stimulating factor (M-CSF) and RANKL signaling pathways. Understanding these pathways is key to controlling bone degradation.

Keywords:
Bone and bonesMacrophage colony-stimulating factorOsteoclastsRANK ligandSignal transduction

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Area of Science:

  • Cell Biology
  • Bone Biology
  • Immunology

Background:

  • Osteoclasts are essential multinucleated cells derived from hematopoietic stem cells.
  • Their primary role is the resorption and degradation of the bone matrix.
  • Dysregulation of osteoclast activity is implicated in various bone diseases.

Purpose of the Study:

  • To summarize the critical signaling pathways governing osteoclast differentiation.
  • To elucidate the roles of M-CSF and RANKL in osteoclastogenesis.
  • To highlight the importance of costimulatory signals in RANK signaling.

Main Methods:

  • Review of existing literature on osteoclast differentiation.
  • Analysis of signaling cascades initiated by M-CSF and RANKL.
  • Focus on the M-CSF-c-Fms and RANKL-RANK pathways.

Main Results:

  • Macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor-κB ligand (RANKL) are essential cytokines for osteoclastogenesis.
  • M-CSF and RANKL bind to their receptors c-Fms and RANK, respectively, initiating signaling cascades.
  • Costimulatory signals play a crucial role in enhancing RANK-mediated osteoclast differentiation.

Conclusions:

  • The M-CSF-c-Fms and RANKL-RANK signaling axes are fundamental for osteoclast differentiation.
  • Integrated signaling, including costimulatory pathways, precisely controls osteoclast formation and function.
  • Further understanding of these pathways may offer therapeutic targets for bone disorders.