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An imbalance in bone remodeling that is caused by increased bone resorption over bone formation leads to most adult skeletal diseases including osteoporosis. Since the development of anti-resorptive agents from natural substances has recently gained more interest in the treatment of osteoporosis, we evaluated the effects of 222 natural compounds on receptor activator of NF-κB ligand (RANKL)-induced of tartrate-resistance acid phosphatase (TRAP) activity in RAW264.7 murine macrophage cell. and found that berberine chloride is one of compounds inhibiting RANKL-induced TRAP activity. Berberine chloride significantly inhibited the RANKL-induced TRAP activity and the formation of multinucleated osteoclasts in a dose-dependent manner. In addition, berberine chloride prevented the RANKL-induced mRNA expression of TRAP. matrix metalloproteinase 9 and c-Src, which have been known to be highly expressed in the process of osteoclastogenesis. Interestingly. berberine chloride prevented the RANKL-induced activation of extracellular signal-regulated kinase (ERK) which is one of mitogen-activated protein (MAP) kinases, In conclusion, berberine chloride could inhibit the osteoclastogenesis via preventing the activation of ERK!MAP kinase signaling pathway.

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Ⅰ. Introduction
Ⅱ. Materials and methods
Ⅲ. Results
Ⅳ. Discussion
Ⅴ. Acknowledgments
Ⅵ. References

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UCI(KEPA) : I410-ECN-0101-2010-519-001425046