Growth factor-free salt-leached silk scaffolds for differentiating endothelial cells

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Protein Chemistry

Background:

• Controllable kinetic assembly in silk protein processing improves scaffold properties.
• Salt-leaching is a common method for creating porous scaffolds.

Purpose of the Study:

• To further control silk kinetic assembly during salt-leaching for enhanced scaffold mechanical properties.
• To investigate the impact of modified hydrophilic interactions and reduced beta-sheet formation on scaffold characteristics.
• To evaluate the biological performance of the engineered silk scaffolds with stem cells.

Main Methods:

• Integration of enhanced control over silk kinetic assembly into the salt-leaching process.
• Utilizing glycerol addition and protein concentration to modulate hydrophilic interactions and beta-sheet formation.
• Characterization of scaffold mechanical properties, including gradient changes in elastic modulus.

Main Results:

• Significant mechanical modification of silk scaffolds was achieved through controlled kinetic assembly.
• Scaffolds exhibited gradient changes in elastic modulus ranging from 0.9 to 7.9 kPa.
• Bone marrow mesenchymal stem cells demonstrated robust growth and endothelial differentiation on optimized scaffolds.

Conclusions:

• Controlled silk kinetic assembly offers a novel method for tailoring porous scaffold properties.
• The engineered scaffolds possess tunable mechanical properties suitable for supporting cell growth and differentiation.
• This approach provides a valuable new option for designing silk-based biomaterials for regenerative medicine.