Canonical and Noncanonical WNT-Loaded Hydrogel for Dentin-Pulp Regeneration

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Regenerative Medicine

Background:

• WNT signaling pathways are crucial for mineralized tissue development and repair.
• Dental pulp stem cells (DPSCs) are key for dentin-pulp complex regeneration.
• Understanding WNT pathway specificity is vital for targeted regenerative therapies.

Purpose of the Study:

• To characterize the roles of WNT5B and WNT10B in DPSC osteo-/odontogenesis.
• To evaluate the efficacy of WNT-loaded hydrogels for dentin-pulp complex regeneration.
• To investigate WNT signaling in DPSC differentiation and tissue formation.

Main Methods:

• In vitro studies using DPSCs treated with recombinant WNT10B, WNT5B, or CHIR 99021.
• Development and characterization of collagen-based hydrogels loaded with WNT proteins.
• In vivo ectopic model using human tooth fragments implanted in mice.

Main Results:

• WNT5B upregulated key osteo-/odontogenic markers (ALP, RUNX2, DMP1) in vitro.
• WNT-loaded hydrogels demonstrated controlled release and were cytocompatible.
• In vivo studies showed WNT-loaded hydrogels induced pulp-like tissue formation with vascularization and polarized cells.

Conclusions:

• Canonical WNT10B and noncanonical WNT5B exhibit distinct roles in DPSC differentiation.
• WNT-loaded hydrogels are effective biomaterials for promoting osteo-/odontogenesis and pulp regeneration.
• This approach holds promise for advanced dentin-pulp complex repair strategies.