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- W2045497567 abstract "In a previous study of the cellular mechanism underlaying Wolff's law we showed that mechanical stimulation by intermittent hydrostatic compression (IHC) increases bone formation in cultured fetal mouse calvariae compared to non-stimulated cultures. To test whether mechanical stimuli may modulate bone-specific gene expression, we studied the effect of IHC on alkaline phosphatase (AP) expression and enzyme activity as well as collagen and actin mRNA levels in neonatal mouse calvariae and calvarial bone cells. Two cell populations, one resembling osteoprogenitor (OPR) cells and another resembling osteoblasts (OB) were obtained from calvariae by sequential digestion. IHC was applied by intermittently (0.3 Hz) compressing the gas- phase of a closed culture chamber (peak stress 13kPa, peak stress rate 32.5 kPas-1). In control cultures of calvariae as well as OB and OPR cells, AP activity and AP-, collagen-, and actin-mRNA levels all decreased after one or more days, with the exception of OPR cell collagen expression which increased during culture. IHC treatment upregulated AP, collagen and actin expression and AP activity in calvariae and OB cells, but decreased collagen expression in OPR cells. These results suggest that treatment with IHC promotes the osteoblastic phenotype in bone organ cultures and in osteoblasts. Osteoprogenitor cells seem to react somewhat differently to mechanical stress than osteoblasts. The loss of bone-specific gene expression under control culture conditions, in the absence of mechanical stimuli, suggests that the mechanical environment is important in maintaining the differentiated phenotype of bone cells, and that IHC treatment partially restores this environment in bone cell- and organ cultures." @default.
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- W2045497567 date "1995-12-01" @default.
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- W2045497567 title "Mechanical stimulation by intermittent hydrostatic compression promotes bone-specific gene expression in vitro" @default.
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- W2045497567 doi "https://doi.org/10.1016/0021-9290(95)00097-6" @default.
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