alexa In vitro differentiation of bone and hypertrophic cartilage from periosteal-derived cells.
Surgery

Surgery

Journal of Trauma & Treatment

Author(s): Nakahara H, Dennis JE, Bruder SP, Haynesworth SE, Lennon DP,

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Abstract Periosteal cells were enzymatically liberated from the tibiae of young chicks, introduced into cell culture, and allowed to reach confluence. The morphology of the cells gave the impression of a relatively homogeneous population of fibroblast-like cells. These cultured cells did not overtly express osteogenic or chondrogenic properties as judged by their morphology and the lack of reactivity with probes to phenotype-specific antigens of osteoblasts or chondrocytes. The cells were then replated at relatively high density and chronologically evaluated for the differentiation of bone and cartilage. These replated cells formed a multi-layer of fibroblast-like cells, the top portion of which eventually differentiated into bone tissue as evidenced by the presence of mineralization and immunocytochemical reactivity to bone Gla protein- and osteocyte-specific probes. Cells below this distinctive top layer differentiated into chondrocytes, which eventually further developed into hypertrophic chondrocytes as evidenced by their morphology and the presence of immunoreactive type X collagen in the matrix. Mineralization was also observed in the territorial matrix of these hypertrophic chondrocytes, when the culture was augmented with beta-glycerophosphate. Periosteal-derived cells replated at a lower density as controls did not show signs of osteochondrogenic differentiation. These observation suggest that periosteal-derived cells of young chicks contain mesenchymal cells which possess the potential to undergo terminal differentiation into osteogenic or chondrogenic phenotypes depending on local environmental or positional cues.
This article was published in Exp Cell Res and referenced in Journal of Trauma & Treatment

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