microRNA-200c Mitigates Pulpitis and Promotes Dentin Regeneration.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Oral Biology

Background:

• MicroRNA (miR)-200c plays a role in osteogenesis and dentin development.
• Inflammation and impaired dentin regeneration are key challenges in vital pulp therapy (VPT).

Purpose of the Study:

• To investigate the potential of miR-200c in mitigating pulpitis and promoting dentin regeneration for improved VPT outcomes.
• To explore miR-200c expression in inflamed pulp tissues and dental pulp cells (DPCs).

Main Methods:

• Assessed miR-200c expression in human inflamed pulp tissues and Porphyromonas gingivalis lipopolysaccharide (Pg-LPS)-challenged DPCs.
• Overexpressed miR-200c using plasmid DNA (pDNA) in vitro and evaluated its effects on odontogenic differentiation and inflammation.
• Utilized CaCO3-based nanoparticles to deliver pDNA encoding miR-200c in a rat pulpitis model.

Main Results:

• Downregulation of miR-200c was observed in inflamed pulp tissues and DPCs.
• miR-200c overexpression reduced pro-inflammatory cytokines (IL-6, IL-8) in DPCs.
• Enhanced expression of odontogenic markers (Runx2, OCN, DMP1, DSPP) and promoted dentin formation in vivo.

Conclusions:

• Locally applied miR-200c effectively modulates pulpal inflammation.
• miR-200c promotes dentin repair, indicating its therapeutic potential for vital pulp therapy.