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Collagen/Chitosan Functionalization of Complex 3D Structures Fabricated by Laser Direct Writing via Two-Photon
Irina Alexandra Păun1,2, Cosmin Cătălin Mustăciosu3,4, Roxana Cristina Popescu3,4
1Center for Advanced Laser Technologies (CETAL), National Institute for Laser, Plasma and Radiation Physics, RO-077125 Magurele, Romania.
International Journal of Molecular Sciences
|September 9, 2020
Summary
Optimizing 3D printed collagen/chitosan (Col/CT) microstructures for bone regeneration, a 20/80 Col/CT blend ratio significantly enhanced osteogenic effects. This functionalization promotes bone substitute development.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Biotechnology
Background:
- 3D microstructures are crucial for developing effective bone substitutes.
- Collagen/chitosan (Col/CT) blends offer promising mechanical and biological properties for bone tissue engineering.
Purpose of the Study:
- To optimize the osteogenic potential of 3D microstructures through functionalization with varying Col/CT blend ratios.
- To investigate the impact of different Col/CT ratios on the bone-forming capabilities of fabricated 3D structures.
Main Methods:
- Fabrication of 3D microstructures using laser direct writing (two-photon polymerization) of IP-L780 photopolymer.
- Functionalization of structures via dip coating in Col/CT blends with varied ratios.
- Assessment of osteogenic effects using biological assays measuring alkaline phosphatase (ALP) activity, osteocalcin secretion, and Alizarin Red (AR) staining.
Main Results:
- Ellipsoidal unit structures demonstrated superior performance compared to hexagonal ones, though trends were similar.
- The optimal Col/CT blend ratio for enhanced osteogenesis was determined to be 20/80.
- The 20/80 Col/CT ratio resulted in the highest ALP activity, osteocalcin secretion, and AR staining intensity.
Conclusions:
- Functionalization of 3D microstructures with Col/CT blends significantly enhances osteogenesis.
- A Col/CT blend ratio of 20/80 is optimal for promoting bone formation in engineered bone substitutes.
- These findings support the use of tailored Col/CT functionalized 3D structures for bone regeneration applications.
