Vaspin facilitates the proliferation and osteogenic differentiation of periodontal ligament stem cells

Area of Science:

• Stem Cell Biology
• Periodontology
• Endocrinology

Background:

• High glucose levels impair periodontal tissue regeneration in human periodontal ligament stem cells (PDLSCs).
• Visceral adipose tissue-derived serine protease inhibitor (vaspin) is upregulated in periodontitis but its role in PDLSCs is unknown.

Purpose of the Study:

• To determine if vaspin can counteract high glucose-induced inhibition of PDLSC proliferation and osteogenic differentiation.
• To explore the underlying molecular mechanisms, focusing on the TGF-β1/Smad signaling pathway.

Main Methods:

• PDLSCs were cultured under normal (5.5 mM) and high (25.0 mM) glucose conditions.
• Cell proliferation was assessed using CCK8 assays.
• Osteogenic differentiation was evaluated via alkaline phosphatase (ALP) staining/activity and Alizarin Red staining.
• Gene and protein expression of osteo-specific markers were analyzed using qRT-PCR and Western blot.
• The TGF-β1/Smad pathway was investigated with and without vaspin and a TGF-β1 inhibitor.

Main Results:

• High glucose significantly reduced PDLSC proliferation and osteogenic differentiation.
• Vaspin addition alleviated the inhibitory effects of high glucose on PDLSCs.
• Vaspin treatment enhanced TGF-β1/Smad signaling pathway activity.
• Inhibition of TGF-β1/Smad signaling abolished the protective effects of vaspin against high glucose.

Conclusions:

• Vaspin mitigates high glucose-induced inhibition of PDLSC osteogenic differentiation by modulating the TGF-β1/Smad pathway.
• Vaspin shows potential as a therapeutic agent for periodontal tissue regeneration, particularly in diabetic patients.