Identification and analysis of chondroitin sulfates which regulate bone remodeling, and control of bone mass

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In present study, I investigated the osteoclast inhibition ability in CS and the mechanism how CS inhibit osteoclast differentiation in vitro. CS was significantly inhibited the number of tartrate-resistance acid phosphatase (TRAP)-positive multinucleated cells and bone resorption activity in pit formation assay.In quartz-crystal microbalance method, CS revealed the binding ability to RANKL and interrupted binding of RANK to RANKL. Furthermore, CS reduced the phosphorylation of extracellular ERK in pre-osteoclast cells. These results indicate that CS suppress osteoclast size and osteoclastogenesis by binding to RANKL and inhibited RANK signal pathway.