Mechanical changes in human dental pulp stem cells during early odontogenic differentiation
Taneka D Jones1, Hamed Naimipour1, Shan Sun1
1Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois.
Journal of Endodontics
|September 22, 2014
Summary
Odontogenic media increases human dental pulp stem cell (hDPSCs) elasticity and focal adhesion formation. This suggests improved cell-matrix interactions are crucial for pulp-dentin tissue regeneration.
Area of Science:
- Biomaterials Science
- Stem Cell Biology
- Tissue Engineering
Background:
- Cell adhesion and migration are vital for tissue regeneration in bioactive scaffolds.
- Human dental pulp stem cells (hDPSCs) exhibit altered mechanical properties during differentiation.
- The impact of odontogenesis factors on hDPSCs' cytoskeleton and focal adhesions remains unclear.
Purpose of the Study:
- To investigate the effects of odontogenic media on the mechanical properties of hDPSCs.
- To examine changes in actin cytoskeleton elasticity and focal adhesion formation in hDPSCs during odontogenesis.
Main Methods:
- Live hDPSCs were cultured in odontogenic media and imaged using atomic force microscopy to measure cytoskeletal Young's modulus.
- Focal adhesion formation was assessed via immunofluorescence, visualizing vinculin and filamentous actin.
- Changes were monitored over a 10-day culture period.
Main Results:
- Odontogenic media significantly increased hDPSCs' cytoskeletal elasticity.
- Both the number and size of focal adhesions increased, correlating with actin remodeling.
- Vinculin expression was upregulated, indicating enhanced cell-matrix interactions.
Conclusions:
- hDPSCs demonstrate firm attachment to substrates when exposed to odontogenic media.
- Biochemical induction factors influencing cell-extracellular matrix interactions are essential for pulp-dentin tissue regeneration using biomimetic scaffolds.
