Single-Cell Analysis Reveals the Soft Tissue Structure Heterogeneity Aggravates Peri-Implantitis Through MDK...

Area of Science:

• Oral biology
• Immunology
• Molecular biology

Background:

• Peri-implantitis (PI) presents unpredictable treatment outcomes, unlike periodontitis (PD).
• Histological data indicate weaker epithelial and immune defenses around implants versus natural teeth.
• The specific molecular mechanisms driving PI pathogenesis remain incompletely understood.

Purpose of the Study:

• To elucidate the molecular and cellular differences in soft tissues surrounding implants and natural teeth.
• To identify key pathways involved in the pathogenesis of peri-implantitis.

Main Methods:

• Single-cell RNA sequencing of gingival tissue from patients with implants and natural teeth.
• Analysis of epithelial barrier function, immune cell populations, and molecular responses.
• In vitro overexpression experiments to assess the role of midkine (MDK) in stromal regeneration.

Main Results:

• Disruption of the peri-implant epithelial barrier is a significant factor in PI.
• The midkine (MDK)-nucleolin (NCL) pathway inhibits crucial epithelial-stromal cell communication.
• Connective tissue defense breakdown exacerbates PI, with MDK playing a role in stromal regeneration.

Conclusions:

• Findings reveal molecular insights into PI pathogenesis, highlighting epithelial barrier integrity and immune defense.
• The MDK-NCL pathway is a potential therapeutic target for peri-implantitis.
• These results support developing targeted interventions to preserve peri-implant soft tissues.