Summary
Using enzymatically isolated rat bone cells in the presence of cytodex microcarrier beads, osteoblastic cell differentiation and bone nodule formation were studied at the optical and electron microscopic level. Cytochemical method showed an intense alkaline phosphatase activity mainly around the microcarriers where the cells have formed multilayers on day 4 of cultures. On day 7 of experiment cultures. Von Kossa method stained positively only the cytodex microcarriers. During the following days, bone nodule formation was closely associated with cytodex microcarriers. In contrast, in control cultures with negatively charged glass beads, cells failed to pile up around the glass beads, and bone nodule formation occurred randomly in the culture dishes with 24 hour delay. Light microscopy observations of experiment cultures revealed the formation of nodular structures, with active osteoblastic cells forming a mineralized matrix in which osteocytes were present. Transmission electron microscopy revealed first, a mineralization process of the surface of the cytodex microcarriers which appeared like a granular electron-dense, collagen-free layer followed by the deposit of a collagenous matrix. These results indicated that cytodex microcarriers provided an excellent matrix for bone cell differentiation and mineralization.
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Sautier, JM., Nefussi, JR. & Forest, N. Mineralization and bone formation on microcarrier beads with isolated rat calvaria cell population. Calcif Tissue Int 50, 527–532 (1992). https://doi.org/10.1007/BF00582168
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DOI: https://doi.org/10.1007/BF00582168