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3D-Printed conductive polymeric scaffolds with direct current electrical stimulation for enhanced bone regeneration
Damion T Dixon1, Cheryl T Gomillion2
1School of Environmental, Civil, Agricultural and Mechanical Engineering, College of Engineering, University of Georgia, Athens, Georgia, USA.
Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|February 24, 2023
Summary
Conductive polymer scaffolds combined with electrical stimulation (ES) show promise for bone repair. This approach enhances osteoblast maturation and mineralization, offering a new avenue for treating bone defects.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Bone defects from genetic disorders, injury, or disease necessitate advanced repair strategies.
- The piezoelectric properties of bone are crucial for natural regeneration, but this bioelectric potential is often compromised in critical-sized defects.
- Current electrical stimulation (ES) therapies for bone regeneration face challenges, particularly when the native bioelectric environment is impaired.
Purpose of the Study:
- To evaluate a 3D-printed conductive polymer blend scaffold for enhancing bone formation by restoring the bioelectrical microenvironment.
- To assess the potential of conductive scaffolds in conjunction with electrical stimulation (ES) for bone tissue engineering.
Main Methods:
- Fabrication of thin-film scaffolds using polylactide (PLA) and a conductive PLA (CPLA) composite via 3D printing.
- Seeding of preosteoblast cells onto scaffolds and application of direct current ES using a custom cell culture chamber.
- Assessment of cell viability, proliferation, differentiation, osteocalcin expression, and mineralized calcium nodule formation.
Main Results:
- Conductive PLA (CPLA) scaffolds demonstrated no adverse effects on cell viability, proliferation, or differentiation compared to control scaffolds.
- Electrical stimulation (ES) significantly increased osteocalcin expression, indicating enhanced osteoblast maturation after 14 days.
- Xylenol orange staining revealed increased mineralized calcium nodules in stimulated cultures, suggesting improved mineralization.
Conclusions:
- 3D-printed conductive polymer scaffolds are biocompatible and support preosteoblast cell growth.
- The combination of conductive scaffolds and ES effectively enhances in vitro bone mineralization and osteoblast maturation.
- This study highlights the potential of low-cost conductive materials for improving bone regeneration therapies, especially in compromised bioelectrical environments.
