MicroRNA Signatures in Dental Pulp Stem Cells Following Nicotine Exposure

Area of Science:

• Stem Cell Biology
• Molecular Toxicology
• Genomics

Background:

• Nicotine is a primary component of tobacco smoke and e-cigarette vapor.
• While nicotine is well-studied, other smoke/vape constituents also negatively impact health.
• The distinct molecular effects of nicotine in stem cells remain underexplored.

Purpose of the Study:

• To investigate the unique impact of nicotine on stem cell molecular mechanisms.
• To examine nicotine's effect on human dental pulp stem cells' (DPSCs) regenerative capacity and microRNA (miRNA) profile.
• To differentiate nicotine's molecular pathways from those induced by whole cigarette smoke condensate (CSC).

Main Methods:

• Assessed the cellular impact of nicotine on DPSC regeneration and miRNA expression.
• Utilized bioinformatic analysis to identify miRNA-regulated pathways affected by nicotine.
• Compared nicotine-induced pathways with those from CSC exposure.

Main Results:

• Nicotine exposure significantly impaired DPSC regeneration and altered miRNA expression.
• Nicotine upregulated specific miRNAs (hsa-miR-7977, hsa-miR-3178, hsa-miR-10400-5p) but not others.
• Nicotine uniquely targeted pathways including apoptosis, MAPK, PI3K-Akt, TGF-b, and Wnt signaling, differing from CSC effects.

Conclusions:

• Nicotine induces a distinctive miRNA signature in stem cells.
• Identified unique molecular pathways affected by nicotine, separate from other smoke components.
• This research provides a basis for personalized disease prevention and treatment based on nicotine's specific molecular effects.