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Xylodon flaviporus-Derived Drimane Sesquiterpenoids That Inhibit Osteoclast Differentiation
Jaeyoung Kwon1, Hyaemin Lee, Seung Mok Ryu2
1Natural Product Informatics Research Center , Korea Institute of Science and Technology (KIST) Gangneung Institute , Gangneung 25451 , Republic of Korea.
Abstract:
The presence of excessive osteoclasts is a major factor in skeletal diseases. The present study aimed to discover osteoclast differentiation inhibitors from the basidiomycete Xylodon flaviporus. Seven new drimane sesquiterpenoids (1-7) and 7-ketoisodrimenin-5-ene (8) were obtained and characterized by various spectroscopic methods. The isolated compounds were evaluated for their inhibitory effects against receptor activator of nuclear factor-kappa-B ligand-induced osteoclastogenesis in mouse bone marrow macrophages. Compounds 1, 3, and 6 showed potent activities with IC50 values of 1.6, 0.9, and 2.1 μM, respectively, while 4, 5, and 7 exhibited relatively weak activities with IC50 values of 10.7, 10.1, and 8.5 μM, respectively.
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