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Electrically stimulated osteogenesis on Ti-PPy/PLGA constructs prepared by laser-assisted processes
Irina Alexandra Paun1, Flavian Stokker-Cheregi2, Catalin Romeo Luculescu2
1Faculty of Applied Sciences, University Politehnica of Bucharest, RO-060042, Romania; National Institute for Laser, Plasma and Radiation Physics, Magurele, Bucharest RO-077125, Romania.
This study presents a laser-based method to create conductive titanium-polypyrrole/poly(lactic-co-glycolic)acid (Ti-PPy/PLGA) scaffolds. Electrically stimulated osteogenesis was enhanced, accelerating bone cell differentiation and mineralization.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Regenerative Medicine
Background:
- Osteogenesis, the process of bone formation, is crucial for bone regeneration and repair.
- Current methods for fabricating bone scaffolds often face limitations in achieving precise microstructures and controlled electrical properties.
- Electrically conductive biomaterials hold promise for enhancing osteogenic differentiation and bone healing.
Purpose of the Study:
- To develop a versatile laser-based protocol for fabricating micro-patterned, electrically conductive Ti-PPy/PLGA constructs.
- To investigate the efficacy of these constructs in promoting electrically stimulated (ES) osteogenesis in vitro.
- To evaluate the impact of ES on osteoblast-like cell behavior, differentiation, and mineralization.
Main Methods:
- Fabrication of micro-patterned titanium (Ti) supports using femtosecond (fs) laser ablation.
- Coating of Ti supports with polypyrrole/poly(lactic-co-glycolic)acid (PPy/PLGA) layers via Matrix Assisted Pulsed Laser Evaporation (MAPLE).
- In vitro assessment of cell viability, osteogenic differentiation (alkaline phosphatase activity), and mineralization (calcium levels) using osteoblast-like MG63 cells under electrical stimulation (200 μA for 4 h).
Main Results:
- The laser-based protocol successfully created micro-patterned, conductive Ti-PPy/PLGA constructs.
- Constructs demonstrated good cell viability without cytotoxicity.
- Electrical stimulation significantly promoted earlier onset of osteogenesis, evidenced by accelerated alkaline phosphatase activity and earlier mineralization.
- Stimulated cultures showed a ~70% increase in calcium levels and bone-like Ca/P ratios compared to controls.
Conclusions:
- The developed laser-based protocol is an efficient method for fabricating advanced Ti-PPy/PLGA constructs for bone tissue engineering.
- Electrically stimulated osteogenesis using these constructs effectively enhances osteoblast differentiation and mineralization.
- This technology offers a promising alternative to existing fabrication methods for bone regeneration applications.
