Biological Response to Bioinspired Microporous 3D-Printed Scaffolds for Bone Tissue Engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Scaffolds are crucial in tissue engineering for repairing large tissue defects.
• Optimizing cell-scaffold interaction and mimicking the natural extracellular matrix (ECM) improves integration and outcomes.
• Bone tissue engineering requires scaffolds that support osteogenesis and integrate with host bone.

Purpose of the Study:

• To create and biologically evaluate 3D-printed polylactic acid (PLA) scaffolds with trabecular architecture for bone tissue engineering.
• To investigate the effect of different pore sizes (400 µm and 600 µm) on cell behavior and osteogenic potential.
• To assess the bioactivity and potential of these bioinspired scaffolds in supporting osteoblast-like cell functions.

Main Methods:

• 3D printing of polylactic acid (PLA) scaffolds with microstructures inspired by natural trabecular bone architecture.
• Biological evaluation using human osteosarcoma SAOS-2 cells seeded on scaffolds with 400 µm and 600 µm pore sizes.
• Analysis of cell growth, actin distribution, protein adsorption, and mRNA expression of osteogenic markers.

Main Results:

• SAOS-2 cells exhibited an exponential growth trend similar to controls on both scaffold types, with no significant alterations in actin distribution.
• The microporous structure of the scaffolds enhanced protein adsorption.
• Increased mRNA expression of markers for protein synthesis, proliferation, and osteoblast differentiation was observed.

Conclusions:

• 3D-printed, bioinspired PLA scaffolds effectively support the adhesion, growth, and differentiation of osteoblast-like cells.
• The microporous architecture, mimicking natural bone structure, promotes enhanced bioactivity.
• These scaffolds represent a valuable tool for advancing bone tissue engineering and regenerative medicine.