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Objectives : The purpose of this study was to evaluate the effects of water extracts of Eucommiae cortex (EC), Psoraleae semen (PS), and their combination on receptor activator of nuclear factor- kappa-B ligand (RANKL)-induced osteoclast differentiation. Methods : We assayed the protein expression levels of nuclear factor of activated T-cells, cytoplasmic 1 (NFATc1), c-Fos, mitogen-activated protein kinases (MAPKs), and β-actin in cell lysates using western blotting. Similarly, mRNA expression levels of NFATc1, c-Fos, tartrateresistant acid phosphate (TRAP), and glyceraldehyde-3-phosphate dehydrogenase, spermatogeni (GAPDHS) from bone marrow macrophages (BMMs) were analyzed using reverse transcription-polymerase chain reaction (RT-PCR). Furthermore, we determined the anti-osteoporotic effects of the water extracts of EC, PS, and their combination in a lipopolysaccharide (LPS)-induced bone-loss mouse model. Results : The in vitro data revealed showed that the combination of EC and PS extract showed a more remarkable inhibition of osteoclast differentiation than each herb did alone. The combination downregulated the induction of c-Fos, NFATc1, and TRAP by suppressing the phosphorylation of p38 and c-Jun N-terminal kinases (JNKs) and inhibiting nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB). Lastly, the in vivo data showed that PS reduced the LPS-induced bone erosion. Conclusion : The result of this study suggests that EC and PS could be potential therapeutic agents for bone loss diseases such as osteoporosis.

Inhibitory Effects of Water Extracts of Eucommiae Cortex and Psoraleae Semen Alone and in Combination on Osteoclast Differentiation and Bone※