Characterization of Highly Osteoblast/Cementoblast Cell Clones From a CD105-Enriched Periodontal Ligament Progenitor Cell Population

• Autores: Miki T. Saito
• Localización: Journal of periodontology, ISSN 0022-3492, Nº. 9, 2014, págs. 205-211
• Idioma: inglés
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• Resumen

  • Background: It is known that periodontal ligament (PDL) harbors a heterogeneous progenitor cell population at different stages of lineage commitment. However, characterization of PDL stem cells committed to osteoblast/cementoblast (O/C) differentiation remains to be elucidated. The present study is carried out to isolate single cell�derived, cluster of differentiation (CD)105�positive PDL clones and to characterize the clones that present high potential to differentiate toward O/C phenotype in vitro.

    Methods: Isolation of single cell�derived colonies (clones) from a CD105-enriched PDL progenitor cell population was performed by the ring-cloning technique. Cell clones were evaluated for their O/C differentiation potential, metabolic activity, and expression of STRO-1 protein. Additionally, the clones that showed potential to O/C differentiation were characterized by quantitative reverse-transcription polymerase chain reaction (qRT-PCR) for expression of runt-related transcriptor factor 2 (RUNX2), alkaline phosphatase, CD105, and CD166 during osteogenic induction.

    Results: Six PDL-CD105+ clones were obtained, three being highly O/C clones (C-O) and three others that did not have the ability to produce mineralized matrix in vitro (C-F). The C-O group showed lower metabolic activity compared with the C-F group, and both cell groups were positively immunostained for STRO-1. qRT-PCR analysis demonstrated an increased expression of transcripts for RUNX2 and CD166 during the maturation of C-O cells toward O/C phenotype.

    Conclusions: These results provide evidence that PDL-CD105+ purified progenitor cells comprise a heterogeneous cell population that presents a cell subset with high O/C potential and, further, that surface antigen CD166 is modulated during the O/C maturation of this cell subset.