CREB3L2 Regulates Hemidesmosome Formation during Epithelial Sealing.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cell Biology

Background:

• Dental implant success relies on a strong biological seal between the implant and surrounding soft tissues.
• Mesenchymal stem cells (MSCs) show potential for improving soft tissue integration around implants, but their precise molecular mechanisms remain unclear.
• The application of MSC sheets for soft tissue integration is an emerging area of research.

Purpose of the Study:

• To investigate the molecular mechanisms by which gingival tissue-derived MSC (GMSC) sheets enhance epithelial sealing around dental implants.
• To elucidate the role of hemidesmosome (HD) formation and the PI3K/AKT pathway in GMSC sheet-mediated soft tissue integration.
• To identify key regulatory factors, such as transcription factors, involved in this process.

Main Methods:

• Treatment of gingival epithelial cells (GECs) with GMSC sheets.
• Analysis of hemidesmosome-related gene and protein expression.
• High-throughput transcriptome sequencing to identify upregulated pathways.
• Pharmacological inhibition of the PI3K/AKT pathway.
• Gene manipulation (overexpression/knockdown) of transcription factor CREB3L2.
• In vivo study using an early implant placement model in rats.

Main Results:

• GMSC sheet treatment significantly increased the expression of HD-related genes and proteins in GECs, strengthening epithelial sealing.
• Transcriptome sequencing revealed significant upregulation of the PI3K/AKT pathway by GMSC sheets.
• CREB3L2 expression was downregulated by GMSC sheets and upregulated by PI3K inhibition, indicating CREB3L2 is downstream of this pathway.
• CREB3L2 manipulation affected HD formation, confirming its role in GMSC sheet-regulated epithelial sealing.
• In vivo, GMSC sheet-implant complexes enhanced HD formation and reduced epithelial penetration.

Conclusions:

• GMSC sheets promote epithelial sealing around dental implants by upregulating hemidesmosome formation, mediated by the PI3K/AKT pathway and the transcription factor CREB3L2.
• CREB3L2 acts as a key downstream regulator in the GMSC sheet-induced enhancement of epithelial attachment.
• These findings provide a mechanistic understanding of MSC sheet application in regenerative medicine for dental implants.