Inhibitory effect of ursane-type triterpenoids from Weigela subsessilis on RANKL-induced osteoclast differentiation

Abstract

Osteoclasts play an important role in bone metabolism by resorbing the bone matrix. Thus, the compounds inhibiting osteoclasts can treat bone diseases such as osteoporosis. Among the 8 triterpenoids tested, we show that Ilekudinol B isolated from the plant Weigela subsessilis inhibits receptor activator of NF-κB ligand (RANKL)-induced osteoclastogenesis from bone marrow-derived monocyte/macrophage cells in a dose-dependent manner, whereas it has no significant effect on osteoblast differentiation. Furthermore, Ilekudinol B attenuates the induction of nuclear factor of activated T cells (NFAT) c1 and osteoclast-associated receptor (OSCAR) expression. Our results indicate that Ilekudinol B has the potential to inhibit osteoclast formation by attenuating the signaling cascades associated with RANKL. Key words: Triterpenoids, osteoclastogenesis, receptor activator of NF-κB ligand (RANKL), inhibitory activity.