期刊
STEM CELLS
卷 37, 期 5, 页码 701-711出版社
OXFORD UNIV PRESS
DOI: 10.1002/stem.2973
关键词
Tissue engineering; Tissue regeneration; Mesenchymal stem cells; In vivo tracking; Hypoxia; Chondrogenesis
资金
- University Paris Descartes
- Fondation des Gueules Cassees
- National French Agency for Research (ANR PulpCell 2014-2018)
- Fondation pour la Recherche Medicale for Plateforme d'Imagerie du Vivant of Universite Paris Descartes [FRM DGE20111123012]
- DIM ile de France Biotherapies
Stem cells endowed with skeletogenic potentials seeded in specific scaffolds are considered attractive tissue engineering strategies for treating large bone defects. In the context of craniofacial bone, mesenchymal stromal/stem cells derived from the dental pulp (DPSCs) have demonstrated significant osteogenic properties. Their neural crest embryonic origin further makes them a potential accessible therapeutic tool to repair craniofacial bone. The stem cells' direct involvement in the repair process versus a paracrine effect is however still discussed. To clarify this question, we have followed the fate of fluorescent murine DPSCs derived from PN3 Wnt1-CRE- Rosa(Tamata) mouse molar (T-mDPSCs) during the repair process of calvaria bone defects. Two symmetrical critical defects created on each parietal region were filled with (a) dense collagen scaffolds seeded with T-mDPSCs, (b) noncellularized scaffolds, or (c) no scaffold. Mice were imaged over a 3-month period by microcomputed tomography to evaluate the extent of repair and by biphotonic microscopy to track T-mDPSCs. Histological and immunocytochemical analyses were performed in parallel to characterize the nature of the repaired tissue. We show that T-mDPSCs are present up to 3 months postimplantation in the healing defect and that they rapidly differentiate in chondrocyte-like cells expressing all the expected characteristic markers. T-mDPSCs further maturate into hypertrophic chondrocytes and likely signal to host progenitors that form new bone tissue. This demonstrates that implanted T-mDPSCs are able to survive in the defect microenvironment and to participate directly in repair via an endochondral bone ossification-like process.
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