Abstract
Stem cells from apical papilla (SCAP) are a novel population of multipotent stem cells that, although similar to dental pulp stem cells, are a discrete source of dental stem cells. SCAP have potential roles in root development, apexogenesis, pulp/dentin regeneration, and bioroot engineering. However, procedures to store and preserve SCAP for future clinical applications have not been explored. In this study, we compared human freshly isolated SCAP (fSCAP) with cryopreserved SCAP (cSCAP) in terms of cell viability, colony-forming efficiency, cell proliferation rate, multilineage differentiation potential, profiles of mesenchymal stem cell (MSC) markers, karyotype analysis, and immunological assays. cSCAP showed a similar viable cell ratio, colony-forming efficiency, cell proliferation rate, multilineage differentiation potential, MSC surface markers, apoptotic rate, and G-banded karyotype when compared to fSCAP. There was no significant difference between fSCAP and cSCAP with regard to immune properties. In addition, cSCAP of miniature pig possessed the similar proliferation rate, differentiation potential, and immunomodulatory function as seen in fSCAP. This study demonstrates that cryopreservation does not affect the biological and immunological properties of SCAP, supporting the feasibility of SCAP cryopreservation in nitrogen.
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