Enhanced cell ingrowth and proliferation through three-dimensional nanocomposite scaffolds with controlled pore...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Developing effective scaffolds is crucial for bone tissue engineering.
• Poly(propylene fumarate) (PPF) and hydroxyapatite (HA) nanoparticles offer potential for creating advanced biomaterials.
• Controlling scaffold architecture is key to optimizing cell response.

Purpose of the Study:

• To fabricate and characterize cross-linked PPF/HA nanocomposite scaffolds with controlled and random pore structures.
• To evaluate the impact of scaffold architecture on cell ingrowth, attachment, and proliferation.
• To assess the potential of these scaffolds for bone tissue engineering.

Main Methods:

• Fabrication of 3D scaffolds using poly(propylene fumarate) (PPF) and hydroxyapatite (HA) nanoparticles.
• Utilized computer-aided design (CAD) and solid freeform fabrication (SFF) for controlled pores; NaCl leaching for random pores.
• Characterized scaffold morphology (SEM), mechanical properties, and pore interconnectivity (micro-CT).
• In vitro studies with MC3T3-E1 preosteoblasts in a rotating-wall-vessel bioreactor.

Main Results:

• Mechanical properties were consistent across different HA concentrations and pore structures.
• Controlled pore structures in PPF/HA scaffolds significantly improved pore interconnectivity.
• Enhanced cell ingrowth depth, attachment, and proliferation were observed in PPF/HA scaffolds with controlled pores.
• Scaffolds cultured for 7 days showed superior cell infiltration and growth.

Conclusions:

• Cross-linked PPF/HA nanocomposite scaffolds with controlled pore structures demonstrate superior performance for bone tissue engineering.
• Optimized pore interconnectivity is critical for promoting cell ingrowth and proliferation.
• These scaffolds represent a promising advancement for regenerative medicine and bone defect repair.