Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/73209
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Type: Journal article
Title: Epithelial cell rests of Malassez contain unique stem cell populations capable of undergoing epithelial-mesenchymal transition
Author: Xiong, J.
Mrozik, K.
Gronthos, S.
Bartold, P.
Citation: Stem Cells and Development, 2012; 21(11):2012-2025
Publisher: Mary Ann Liebert Inc Publ
Issue Date: 2012
ISSN: 1547-3287
1557-8534
Statement of
Responsibility: 
Jimin Xiong, Krzysztof Mrozik, Stan Gronthos, and P. Mark Bartold
Abstract: The epithelial cell rests of Malassez (ERM) are odontogenic epithelial cells located within the periodontal ligament matrix. While their function is unknown, they may support tissue homeostasis and maintain periodontal ligament space or even contribute to periodontal regeneration. We investigated the notion that ERM contain a subpopulation of stem cells that could undergo epithelial-mesenchymal transition and differentiate into mesenchymal stem-like cells with multilineage potential. For this purpose, ERM collected from ovine incisors were subjected to different inductive conditions in vitro, previously developed for the characterization of bone marrow mesenchymal stromal/stem cells (BMSC). We found that ex vivo-expanded ERM expressed both epithelial (cytokeratin-8, E-cadherin, and epithelial membrane protein-1) and BMSC markers (CD44, CD29, and heat shock protein-90β). Integrin α6/CD49f could be used for the enrichment of clonogenic cell clusters [colony-forming units-epithelial cells (CFU-Epi)]. Integrin α6/CD49f-positive-selected epithelial cells demonstrated over 50- and 7-fold greater CFU-Epi than integrin α(6)/CD49f-negative cells and unfractionated cells, respectively. Importantly, ERM demonstrated stem cell-like properties in their differentiation capacity to form bone, fat, cartilage, and neural cells in vitro. When transplanted into immunocompromised mice, ERM generated bone, cementum-like and Sharpey's fiber-like structures. Additionally, gene expression studies showed that osteogenic induction of ERM triggered an epithelial-mesenchymal transition. In conclusion, ERM are unusual cells that display the morphological and phenotypic characteristics of ectoderm-derived epithelial cells; however, they also have the capacity to differentiate into a mesenchymal phenotype and thus represent a unique stem cell population within the periodontal ligament.
Keywords: Cells, Cultured; Epithelial Cells; Stem Cells; Periodontal Ligament; Incisor; Animals; Mice, Inbred NOD; Sheep; Mice; Mice, SCID; Cadherins; Antigens, CD44; Integrin alpha6; Biological Markers; Immunohistochemistry; Cell Differentiation; Cell Lineage; Osteogenesis; Chondrogenesis; Keratin-8; Epithelial-Mesenchymal Transition
Rights: © Mary Ann Liebert, Inc.
RMID: 0020120884
DOI: 10.1089/scd.2011.0471
Grant ID: http://purl.org/au-research/grants/nhmrc/627143
Appears in Collections:Dentistry publications

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