We determined the effects of yolk water-soluble protein (YSP) on bone formation in pre-osteoblastic MC3T3-E1 cells. YSP (50-5,000 microg/ml) increased cell proliferation and collagen content. Alkaline phosphatase (ALP) activity was also increased by YSP treatment. After enhancement of ALP activity, significant augmentation of calcification was observed. These results suggest that YSP is a promising agent for the prevention and treatment of bone loss.
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