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Dental epithelial stem cells (DESCs) drive continuous growth in the adult mouse incisors. To date, a robust system for the primary culture of these cells has not been reported, and little is known about the basic molecular architecture of these cells or the minimal extracellular scaffolding that is necessary to maintain the epithelial stem cell population in an undifferentiated state. We report a method of isolating DESCs from the cervical loop of the mouse mandibular incisor. Cells were viable in a two-dimensional culture system and did not demonstrate preferential proliferation when grown on top of various substrates. Characterization of these cells indicated that E-cadherin, integrin alpha-6, and integrin beta-4 mark the DESCs both in vivo and in vitro. We also grew these cells in a three-dimensional microenvironment and obtained spheres with an epithelial morphology and expression patterns. Insights into the mechanisms of stem cell maintenance in vitro will help lay the groundwork for the successful generation of bioengineered teeth from adult DESCs.

Characterization of Dental Epithelial Stem Cells from the Mouse Incisor with Two-Dimensional and Three-Dimensional Platforms