Hierarchical wrinkle pattern drives tenogenic differentiation from human mesenchymal stem cells

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Tissue Engineering

Background:

• Stem cells are crucial for regenerative medicine due to their self-renewal and differentiation capabilities.
• Substrate topography significantly influences stem cell behavior and fate.
• Mimicking natural extracellular matrix structures is key for effective tissue engineering.

Purpose of the Study:

• To investigate the effect of hierarchical wrinkle patterns on poly(dimethylsiloxane) (PDMS) substrates on human bone marrow-derived mesenchymal stem cells (hMSCs).
• To determine if bio-inspired substrate topography can direct stem cell differentiation without chemical induction.
• To explore the potential of these substrates in advancing regenerative therapies.

Main Methods:

• Fabrication of PDMS substrates with hierarchical wrinkle patterns using gold-coated elastomer bilayers.
• Culturing hMSCs on these patterned substrates.
• Analyzing cell alignment and gene expression of differentiation markers (tenogenic, osteoblast, chondrocyte).

Main Results:

• Hierarchical wrinkles on PDMS substrates promoted significant cell alignment.
• Tenogenic differentiation markers (Mkx, Col1) were upregulated without chemical induction.
• Osteoblast (Alp, Opn) and chondrocyte (Sox9) markers showed decreased expression.
• The substrate topography effectively directed stem cell fate towards a tenocyte lineage.

Conclusions:

• Bio-inspired hierarchical wrinkle patterns on PDMS substrates can guide hMSC behavior and tenogenic differentiation.
• This approach offers a promising strategy for developing functional tissue constructs and regenerative therapies.
• Substrate topography plays a critical role in mechanobiology and stem cell fate determination.