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Dental Epithelial Histomorphogenesis in vitro

¹ UMR INSERM 595 and
³ UMR 7104 CNRS-ULP INSERM U596, Faculté de Médecine, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg Cedex, France;
² Molecular Laboratory for Gene Therapy, Faculty of Stomatology, Capital University of Medical Sciences, Beijing, P.R. China;

^* corresponding author, Herve.Lesot{at}odonto-ulp.u-strasbg.fr

Recent developments in tooth-tissue engineering require that we understand the regulatory processes to be preserved to achieve histomorphogenesis and cell differentiation, especially for enamel tissue engineering. Using mouse first lower molars, our objectives were: (1) to determine whether the cap-stage dental mesenchyme can control dental epithelial histogenesis, (2) to test the role of the primary enamel knot (PEK) in specifying the potentialities of the dental mesenchyme, and (3) to evaluate the importance of positional information in epithelial cells. After tissue dissociation, the dental epithelium was further dissociated into individual cells, re-associated with dental mesenchyme, and cultured. Epithelial cells showed a high plasticity: Despite a complete loss of positional information, they rapidly underwent typical dental epithelial histogenesis. This was stimulated by the mesenchyme. Experiments performed at E13 demonstrated that the initial potentialities of the mesenchyme are not specified by the PEK. Positional information of dental epithelial cells does not require the memorization of their history.

KEY WORDS: epithelial-mesenchymal interaction • epithelial histogenesis • positional information • odontogenesis • tissue engineering

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