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KMID : 0362320120370010034
Journal of Korean Academy of Operative Dentistry
2012 Volume.37 No. 1 p.34 ~ p.40
Morphological evaluation during in vitro chondrogenesis of dental pulp stromal cells
Chung Choo-Ryung

Kim Ha-Na
Park Yeul
Kim Min-Jung
Oh Young-Ju
Shin Su-Jung
Choi Yoon-Jeong
Kim Kyung-Ho
Abstract
Objectives: The aim was to confirm the stem cell-like properties of the dental pulp stromal cells and to evaluate the morphologic changes during in vitro chondrogenesis.

Materials and Methods: Stromal cells were outgrown from the dental pulp tissue of the premolars. Surface markers were investigated and cell proliferation rate was compared to other mesenchymal stem cells. Multipotency of the pulp cells was confirmed by inducing osteogenesis, adipogenesis and chondrogenesis. The morphologic changes in the chondrogenic pellet during the 21 day of induction were evaluated under light microscope and transmission electron microscope. TUNEL assay was used to evaluate apoptosis within the chondrogenic pellets.

Results: Pulp cells were CD90, 105 positive and CD31, 34 negative. They showed similar proliferation rate to other stem cells. Pulp cells differentiated to osteogenic, adipogenic and chondrogenic tissues. During chondrogenesis, 3-dimensional pellet was created with multi-layers, hypertrophic chondrocyte-like cells and cartilage-like extracellular matrix. However, cell morphology became irregular and apoptotic cells were increased after 7 day of chondrogenic induction.

Conclusions: Pulp cells indicated mesenchymal stem cell-like characteristics. During the in vitro chondrogenesis, cellular activity was superior during the earlier phase (within 7 day) of differentiation.
KEYWORD
Cartilage, Chondrogenic pellet, Dental pulp stem cell, Dental pulp stromal cell, in vitro chondrogenesis
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