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<dc:title xml:lang="fr">L'innervation en ingénierie dentaire</dc:title>
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<dc:subject xml:lang="fr">Ingénierie de l’organe dentaire</dc:subject>
<dc:subject xml:lang="fr">Innervation</dc:subject>
<dc:subject xml:lang="fr">Vascularisation</dc:subject>
<dc:subject xml:lang="fr">Cellules gliales</dc:subject>
<dc:subject xml:lang="fr">Immunomodulation</dc:subject>
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<dc:subject xml:lang="en">Tooth organ engineering</dc:subject>
<dc:subject xml:lang="en">Innervation</dc:subject>
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<dcterms:abstract xml:lang="fr">Notre approche biomimétique permet de régénérer une dent entière. Un protocole en deux étapes à partir de réassociations de cellules dentaires embryonnaires permet le développement de la couronne in vitro et, après implantation, la différenciation fonctionnelle des cellules, l’initiation du développement radiculaire et la vascularisation dentaire. Cependant, l’absence d’innervation a nécessité des expériences complémentaires :- La co-implantation de réassociations cellulaires avec un ganglion trigéminal permet la croissance d’axones autour de la dent formée, mais pas dans le mésenchyme dentaire.- Pour tenter de résoudre ce problème, la régénération axonale a été testée dans un contexte immunodéprimé en utilisant la cyclosporine A (CsA). Dans ces conditions, des fibres nerveuses entrent dans la pulpe dentaire, jusqu’aux odontoblastes. Cependant, la CsA a aussi un effet direct sur la croissance axonale.- Des co-implantations chez des souris immunodéprimées (Nude) montrent que l’immunomodulation seule suffit pour l’innervation de la dent.- Dans la dent, les axones assurent différentes fonctions en interagissant avec les cellules voisines. Les relations entre axones et autres cellules (odontoblastes, cellules endothéliales, péricytes et cellules gliales) ont été analysées dans les mésenchymes dentaire et péri-dentaire de réassociations implantées et comparées à ce que l’on observe pour une molaire physiologique à un stade similaire.Ce travail décrit les conditions permettant l’innervation des dents régénérées. Des expériences préliminaires encourageantes ont été réalisées avec des cellules souches pour remplacer la CsA.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Our biomimetic approach allowed the regeneration of a whole tooth. Using embryonic dental cells, a two-steps protocol allowed crown formation in vitro and, after implantation, functional cells differentiation, initiation of root formation and tooth vascularization. However, the teeth were not innervated, which led to complementary experiments:- The co-implantation of cell re-associations with a trigeminal ganglion allowed axonal growth around the forming teeth, but not in the dental mesenchyme. - To try to solve this point, axonal regeneration was tested in immunodepressed conditions, using cyclosporin A (CsA). In these conditions, nerve fibers entered the dental pulp and reached odontoblasts. However, CsA shows multiple effects, including direct ones on nerve growth. - Co-implantations were performed in immunocompromised Nude mice allowed axons to reach the odontoblast layer, thus showing that immunomodulation is sufficient.- Axons in the dental mesenchyme interfere with several functions by interacting with neighbor cells. Relationships between axons and other cells (odontoblasts, endothelial cells, pericytes and glial cells) were analyzed in the peridental and dental mesenchymes of implanted reassociations and compared to the physiological situation in developing molars at similar stage. This work describes conditions allowing the innervation of engineered teeth. Preliminary encouraging attempts have been made to replace CsA by using stem cells.</dcterms:abstract>
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