Punicalagin Enhances Odontogenic Differentiation and Reparative Dentin Formation via Wnt/β-Catenin Signalling

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cell Biology

Background:

• Punicalagin (PCG), a polyphenol from pomegranate peel, has known antibacterial and anti-inflammatory effects.
• Its role in promoting odontogenic differentiation of human dental pulp stem cells (DPSCs) is not well understood.
• Investigating PCG's potential in dentin-pulp regeneration is crucial.

Purpose of the Study:

• To investigate the effects of PCG on the odontogenic differentiation of DPSCs.
• To evaluate PCG's efficacy in reparative dentin formation in vivo.
• To elucidate the molecular mechanisms underlying PCG's action, particularly the Wnt/β-catenin pathway.

Main Methods:

• A rat pulpitis model was used to assess pulpal repair and dentin formation following PCG application.
• DPSCs were isolated and treated with PCG (5 μM) to evaluate cell viability and differentiation.
• Odontogenic markers, Wnt/β-catenin signaling, and β-catenin nuclear translocation were analyzed using molecular and histological techniques, including DKK-1 inhibition assays.

Main Results:

• PCG significantly reduced inflammation and promoted reparative dentin formation in a rat pulpitis model.
• PCG enhanced DPSC odontogenic differentiation, upregulating key markers like ALP, Runx2, DMP-1, and DSPP.
• PCG activated the Wnt/β-catenin pathway, evidenced by increased β-catenin nuclear translocation, an effect partially blocked by DKK-1.

Conclusions:

• PCG promotes DPSC odontogenic differentiation, partly via Wnt/β-catenin pathway activation.
• PCG demonstrates potential as a therapeutic agent for dentin-pulp repair.
• These findings support further research into PCG for vital pulp therapy strategies.