Abstract
Licochalcone A on the formation and bone resorptive activity of osteoclasts up to 5muM significantly inhibited the receptor activator of nuclear factor kappaB (NF-kappaB) ligand (RANKL)-induced activity of tartrate-resistant acid phosphatase (TRAP) activity and formation of osteoclasts without any effect on cell viability. Interestingly, licochalcone A was shown to inhibit the RANKL-induced activation of extracellular signal-regulated kinase, translocation of NF-kappaB into nucleus and mRNA expression of Fra-2. Licochalcone A also inhibited the bone resorptive activity of mature osteoclasts and the expression of bone resorption-related genes. Inhibitory effects of licochalcone A on the formation and bone resorptive activity of mouse bone marrow macrophage-derived osteoclasts were also observed. In conclusion, licochalcone A has the potential to inhibit the formation of osteoclasts as well as the bone resorptive activity of mature osteoclasts.
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