The effect of medium conditioned by whole bone was examined on the activity of a heterogeneous population of rat calvarial cells grown under serum-deprived conditions. Conditioned medium (CM) had pronounced effects on the appearance of cultures within 24-48 hours of addition. This was characterized by the breakdown of the cell monolayer, rounding of cells and formation of alkaline phosphatase-positive aggregates. Cellular alkaline phosphatase activity was increased compared to controls while acid phosphatase levels were reduced. These aggregates grown in the presence of 10 mM beta-glycerophosphate did not show evidence of mineralization. These results show that soluble factors derived from calvarial bone are responsible for cell aggregation, cell proliferation and increase in alkaline phosphatase activity.
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