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S 12911-2 inhibits osteoclastic bone resorption in vitro
N Takahashi1, T Sasaki, Y Tsouderos
1Department of Biochemistry, School of Dentistry, Showa University, Tokyo, Japan.
Summary
The strontium compound S12911-2 effectively inhibits osteoclast activity, reducing bone resorption in vitro. This anti-osteoporotic effect is linked to strontium and involves decreased osteoclast ruffled border formation.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Osteoporosis is a condition characterized by reduced bone density and increased fracture risk.
- Osteoclast activity is crucial for bone resorption and maintaining bone homeostasis.
- Strontium compounds have shown potential in treating bone disorders.
Purpose of the Study:
- To evaluate the anti-osteoporotic effects of the strontium compound S12911-2.
- To investigate the impact of S12911-2 on osteoclast-like cells and cultured bone.
- To determine the mechanism by which S12911-2 affects bone resorption.
Main Methods:
- Osteoclast-like cells were cultured and allowed to resorb dentine slices.
- Resorption pit areas were measured using image analysis.
- Bone resorption in cultured fetal mouse long bones was assessed by measuring 45calcium release.
- Osteoclast morphology was examined using electron microscopy.
Main Results:
- S12911-2 significantly reduced pit formation by osteoclast-like cells at 1 mM Sr2+.
- S12911-2 inhibited bone resorption in cultured fetal mouse long bones by 18.9% in control and 44.5% in vitamin D3-stimulated cultures.
- Electron microscopy revealed that S12911-2 treated osteoclasts lacked well-developed ruffled borders.
Conclusions:
- S12911-2 inhibits osteoclast activity and bone resorption.
- The anti-resorptive effect is strontium-dependent and effective on both basal and stimulated resorption.
- S12911-2's mechanism involves a decrease in osteoclast ruffled border formation.