Nanostructured polymer scaffolds for tissue engineering and regenerative medicine

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Tissue engineering scaffolds mimic the natural extracellular matrix (ECM) to support cell functions.
• Nanofibrous scaffolds are designed to replicate the collagen fiber structure of the ECM (50-500 nm diameter).
• Bone tissue engineering is a key application area for these advanced scaffold designs.

Purpose of the Study:

• To review and highlight novel scaffold engineering techniques for improved tissue regeneration.
• To focus on nanofibrous scaffolds and the incorporation of nanofeatures and composite materials.
• To demonstrate enhanced cell response with engineered scaffolds compared to controls.

Main Methods:

• Development of a thermally induced phase separation (TIPS) process for creating nanofibrous polymer scaffolds.
• Utilizing porogen leaching to engineer interconnected 3D pore structures for cell migration.
• Growing apatite crystals onto polymer scaffolds using simulated body fluid (SBF) for composite material development.
• Integrating nanoparticles for the delivery of bioactive molecules.

Main Results:

• Nanofibrous scaffolds fabricated via TIPS mimic natural ECM fiber diameters.
• Engineered scaffolds with interconnected pores promote cell migration and 3D tissue ingrowth.
• Composite scaffolds with grown apatite crystals show improved cell adhesion, proliferation, and differentiation.
• Composite scaffolds demonstrated a reduced incidence of apoptosis in bone tissue engineering applications.
• Nanoparticle integration facilitated the delivery of growth factors to regulate cell behavior.

Conclusions:

• Engineered nanofibrous and composite scaffolds significantly improve cell response compared to conventional scaffolds.
• Advanced scaffold designs, including nanostructure and composite incorporation, are crucial for effective tissue regeneration.
• Future work focuses on optimizing crystal distribution and creating nanoscale apatite deposits to further mimic the ECM.