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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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 bone...
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.

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Related Experiment Video

Updated: Jun 13, 2026

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro
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Published on: June 16, 2022

Gallium modulates osteoclastic bone resorption in vitro without affecting osteoblasts.

Elise Verron1, Martial Masson, Solmaz Khoshniat

  • 1Inserm U, Lioad, France.

British Journal of Pharmacology
|April 17, 2010
PubMed
Summary

Gallium (Ga) inhibits osteoclast activity and formation in vitro, offering a potential therapeutic for bone loss disorders. This gallium effect is dose-dependent and does not harm osteoblasts.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Bone Biology

Background:

  • Gallium (Ga) shows promise in treating bone loss disorders like hypercalcemia and Paget's disease.
  • Clinical use suggests Ga reduces bone resorption, but its direct effects on osteoclasts are understudied.

Purpose of the Study:

  • To investigate the effects of Gallium on osteoclastic resorption and osteoblast activity in vitro.
  • To elucidate the molecular mechanisms underlying Gallium's impact on bone cells.

Main Methods:

  • Osteoclast models (rabbit, murine, human cells) were used to assess resorption activity, TRAP staining, gene expression, viability, and apoptosis.
  • Osteoblast cell lines (MC3T3-E1) and primary osteoblasts were evaluated for proliferation, viability, and activity.

Main Results:

  • Gallium dose-dependently inhibited osteoclast resorption and reduced osteoclastic marker gene expression.
  • Gallium decreased the formation of TRAP-positive multinucleated cells and down-regulated NFATc1 expression.
  • Gallium did not negatively impact osteoblast viability or activity.

Conclusions:

  • Gallium demonstrates a dose-dependent anti-osteoclastic effect by inhibiting resorption, differentiation, and formation.
  • The mechanism involves down-regulation of NFATc1, a key regulator of osteoclast differentiation.
  • Gallium presents a potential therapeutic strategy for bone resorption disorders without adverse effects on osteoblasts.