Summary
Periostea consisting of the osteogenic layer and the fibrous layer of the periosteum were dissected from 17-day-old embryonic chick calvariae, leaving the osteoblasts behind on bone. The dissected periostea were folded with the osteogenic cells in apposition. The explants were cultured on plasma clots for up to 6 days, during which time osteodifferentiation was observed followed by osteoid formation in between the two layers. These cultures consistently mineralized in the presence of 5 or 10 mMβ-glycerophosphate. The mineralization and osteoid formation displayed many characteristics identical with those seen in vivo. Specifically, the osteoid formed was birefringent under polarized light, the central zone of osteoid became mineralized within 24 h of formation in vitro, and a clear border between mineralized and non-mineralized osteoid suggestive of a mineralization front was present. The unmineralized osteoid at the periphery was surrounded by osteoblasts. These data suggest that physiologic mineralization of osteoid produced in vitro did occur in this system by the addition of the alkaline phosphatase substrateβ-glycerophosphate.
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Tenenbaum, H.C., Heersche, J.N.M. Differentiation of osteoblasts and formation of mineralized bone in vitro. Calcif Tissue Int 34, 76–79 (1982). https://doi.org/10.1007/BF02411212
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DOI: https://doi.org/10.1007/BF02411212