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The effects of Eisenia bicyclis extracts on osteoblast differentiation and osteoclast formation were investigated. The proliferation of MC3T3-E1 osteoblastic cells was tested in an MTT assay. Treatment with E. bicyclis ethanol extract increased cell proliferation by approximately 128% at a concentration of 10 μg/ml. The ALP activities in the MC3T3-E1 cells was 179% higher when the E. bicyclis ethanol extract was processed at a concentration of 50 μg/ml. The proliferation of RAW 264.7 osteoclastic cells decreased significantly in response to treatment with the E. bicyclis extracts. Moreover, the proliferation of the RAW 264.7 osteoclastic cells treated with E. bicyclis hot water extract decreased by nearly 80%. In addition, the E. bicyclis extract reduced the number of tartrate-resistant acid phosphatase-positive (TRAP+) multinucleated cells from osteoclastic RAW 264.7 cells. These results indicate that E. bicyclis extracts have an anabolic effect on bone through the promotion of osteoclast differentiation and suggest that the extracts could be used in the treatment of common metabolic bone diseases.

Effects of Eisenia bicyclis Extracts on the Proliferation and Activity of Osteoblasts and Osteoclasts