Gradient in Motion: Mechanical Stimulation Of Cells Cultured on Melt Electrowritten Scaffolds

Area of Science:

• Tissue Engineering
• Biomaterials Science
• Cellular Mechanics

Background:

• Tissue engineering requires complex scaffolds to mimic damaged tissues and support cell growth.
• Melt Electrowriting (MEW) offers high precision 3D printing for intricate scaffold fabrication with controlled mechanics.

Purpose of the Study:

• To design and fabricate gradient scaffolds with distinct, seamlessly connected zones using MEW.
• To investigate the influence of scaffold design and mechanical forces on human dermal fibroblast alignment and behavior.
• To evaluate the role of dynamic versus static mechanical stimulation on cell organization within the gradient scaffolds.

Main Methods:

• Fabrication of gradient scaffolds with square, rhombus, and radial zones using Melt Electrowriting (MEW).
• Mechanical testing to determine Young's modulus of the gradient scaffolds.
• Culture of human dermal fibroblasts on scaffolds under static and dynamic (7% cyclic tensile strain) conditions for up to 24 days.

Main Results:

• Gradient scaffolds exhibited zone-specific pore sizes and mechanical properties (Young's modulus).
• Fibroblasts showed zone-specific alignment influenced by scaffold geometry and applied forces.
• Cell alignment was maintained under dynamic stimulation but lost under continuous static culture, highlighting the importance of mechanical cues.

Conclusions:

• MEW-fabricated gradient scaffolds can induce distinct, zone-specific cellular responses through region-dependent deformation modes.
• Dynamic mechanical stimulation is critical for maintaining cell organization within engineered scaffolds.
• These findings offer new strategies for designing advanced scaffolds for tissue regeneration, especially for load-bearing tissues.