Dentin matrix components extracted with phosphoric acid enhance cell proliferation and mineralization

Area of Science:

• Biomaterials Science
• Regenerative Dentistry
• Cell Biology

Background:

• Acids in adhesive dentistry can solubilize bioactive molecules from dentin.
• Dentin matrix components (DMC) may play a role in dentin regeneration.
• Understanding DMC's effect on pulp cells is crucial for regenerative strategies.

Purpose of the Study:

• To evaluate the impact of varying concentrations of DMC on pulp cell proliferation and mineralization.
• To assess DMC extracted by phosphoric acid at different pH levels and EDTA.
• To investigate the dose-dependent effects of DMC on two distinct cultured pulp cell populations.

Main Methods:

• DMC were extracted from human dentin using phosphoric acid (pH 1, 3, 5) and EDTA.
• Extracted DMC were purified and lyophilized.
• Mouse dental pulp cells (OD-21) and odontoblast-like cells (MDPC-23) were treated with different DMC concentrations.
• Cell proliferation was measured using Alamar blue assay, and mineralization by Alizarin Red S assay.

Main Results:

• A dose-dependent increase in cell proliferation was observed with higher DMC concentrations.
• DMC significantly enhanced mineralization compared to controls, particularly at 10.0μg/ml.
• EDTA and pH 5 extracts showed enhanced mineralization even at lower concentrations.

Conclusions:

• Dentin matrix components (DMC) solubilized by acidic conditions promote pulp cell proliferation and mineralization.
• These findings support the potential of DMC in dentin regeneration therapies.
• Adequate concentrations of DMC are essential for stimulating these cellular responses.