High-plasticity mesenchymal stem cells isolated from adult-retained primary teeth and autogenous adult tooth pulp--A potential source for regenerative therapies?

PURPOSE: The objective of this study was to compare the growth rate, morphology, immunohistology and plasticity of autogenous adult-retained SHEDs (arSHEDs) and adult dental pulp stem cells (DPSCs) obtained from the same donor.

METHODS: Expression of the mesenchymal stem cell markers CD44, CD90, CD105, caspase-3 and GAPDH were assessed using RT-PCR. Caspase-3 and CD44 were also evaluated at the protein level by western blotting of cell lysates. Plasticity of DPSCs and arSHEDs were tested by culture in adipogenic, chondrogenic, osteogenic and Schwann cells induction media.

RESULTS: DPSCs and arSHEDs were isolated by explant culturing and were similarly positive for growth rate and all tested markers. Furthermore, DPSCs and arSHEDs could be driven to adipocyte, chondrocyte, osteocyte and Schwann cells lineages thus indicating similar plasticity as precursor cells.

CONCLUSION: This study demonstrates the similarities between DPSCs and arSHEDs in a unique situation, where both stem cells (SC) types were obtained from a single patient and thus represent an alternative source of SC's for tissue engineering and regeneration.