Odontogenic capability: bone marrow stromal stem cells versus dental pulp stem cells

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Dental Research

Background:

• Adult stem cells can generate teeth when combined with embryonic oral epithelium.
• The comparative odontogenic potential of dental versus non-dental stem cells is not fully understood.

Purpose of the Study:

• To compare the odontogenic capacity of dental pulp stem cells (DPSCs) and bone marrow stromal stem cells (BMSSCs).
• To investigate stem cell-mediated odontogenesis under controlled inductive conditions.

Main Methods:

• Isolated STRO-1(+) DPSCs and BMSSCs using magnetic-activated cell sorting.
• Co-cultured stem cells with apical bud cells (ABCs) in vitro and in vivo (rat renal capsule model).
• Assessed odontogenic differentiation via matrix mineralization, alkaline phosphatase activity, and gene/protein expression.

Main Results:

• DPSCs exhibited superior in vitro odontogenic differentiation compared to BMSSCs, evidenced by accelerated mineralization and higher alkaline phosphatase activity.
• In vivo, DPSC/ABC recombinants formed typical tooth-shaped tissues with enamel and dentin, while BMSSC/ABC recombinants produced atypical dentin-pulp complexes lacking enamel.
• DPSC and BMSSC pellets formed osteodentin-like structures and fibrous connective tissues, respectively.

Conclusions:

• DPSCs possess significantly higher odontogenic capability than BMSSCs when induced by postnatal ABCs.
• This study provides crucial data for selecting appropriate stem cell populations for dental regeneration.