In vitro differentiation potential of the periosteal cells from a membrane bone, the quadratojugal of the embryonic chick

Developmental Biology
J Fang, B K Hall

Abstract

The quadratojugal (QJ) is a neural crest-derived membrane bone in the maxillary region of the avian head. In vivo its periosteum undergoes both osteogenesis to form membrane bone and chondrogenesis to form secondary cartilage. This bipotential property, which also exists in some other membrane bones, is poorly understood. The present study used cell culture to investigate the differentiation potential of QJ periosteal cells. Three cell populations were enzymatically released from QJ periostea and plated at different densities. Cell density greatly affected phenotypic expression and differentiation pathways. We found two culture conditions that favored osteogenesis and chondrogenesis, respectively. In micromass culture, the periosteal cells produced a layer of osteogenic cells that expressed alkaline phosphatase (APase) and secreted bony extracellular matrix (ECM). In contrast, low-density monolayer culture elicited chondrogenesis. Cells with pericellular refractile ECM and round shape appeared at 7 to 8 days and formed colonies later. The chondrogenic phenotype of these cells was confirmed by immunolocalization of type II collagen and Alcian blue staining of ECM. This result demonstrated that a fully expressed chondrogenic phen...Continue Reading

Citations

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