Abstract
In an organ culture system under a three-dimensional microenvironment that provides the conditions needed for odontoblast differentiation, a row of odontoblasts can be induced (Kikuchi et al. 1996, 2001). Therefore, in a newly designed three-dimensional cell culture system that fulfils the conditions necessary for odontoblast differentiation (Kikuchi et al. 2002), we examined whether dental papilla cells in rat mandibular incisors could differentiate into tubular dentine-forming cells. In our previously established organ culture system, CM-Dil-labeled cells that were microinjected into isolated dental papillae were replaced by a row of odontoblasts. In a three-dimensional cell culture system, which consists of two kinds of type I collagen in the upper layer over multi-layered cells seeded onto collagen containing Matrigel in the lower layer and which acts as a structural meshwork, dental papilla cells were incubated as multi-layered cells in an artificial extracellular matrix (ECM). The cells aggregated to form a cell mass and invaginated as a cell mass into the ECM. The cells also extended fine fibrillar processes into the ECM. With regard to invagination, the proteolytic activities of matrix metalloproteinase-2 (MMP-2)/membra...Continue Reading
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