Rapid mineralization of hierarchical poly(l-lactic acid)/poly(ε-caprolactone) nanofibrous scaffolds by electrodeposition for bone regeneration

• Published in: International journal of nanomedicine Vol. 14; pp. 3929 - 3941
• Main Authors: Nie, Wei, Gao, Yiming, McCoul, David James, Gillispie, Gregory James, Zhang, YanZhong, Liang, Li, He, ChuangLong
• Format: Journal Article
• Language: English
• Published: New Zealand Dove 01.01.2019; Dove Medical Press
• Subjects: Alkaline Phosphatase - metabolism; Animals; Bone Regeneration - physiology; bone repair; Cell Adhesion - drug effects; Cell Proliferation - drug effects; Electricity; electrodeposition; Electroplating - methods; hierarchical porous scaffold; Mesenchymal Stem Cells - cytology; Mesenchymal Stem Cells - drug effects; Mesenchymal Stem Cells - ultrastructure; mineralization; Minerals - chemistry; Nanofibers - chemistry; Original Research; Osteogenesis - drug effects; Polylactic Acid-Polyglycolic Acid Copolymer - pharmacology; Porosity; Rats, Sprague-Dawley; Skull - diagnostic imaging; Skull - drug effects; Skull - pathology; Time Factors; Tissue Engineering - methods; Tissue Scaffolds - chemistry; X-Ray Microtomography; mineralization; hierarchical porous scaffold; electrodeposition; bone repair
• ISSN: 1178-2013; 1176-9114; 1178-2013
• DOI: 10.2147/ijn.s205194

Hierarchical nanofibrous scaffolds are emerging as a promising bone repair material due to their high cell adhesion activity and nutrient permeability. However, the existing method for hierarchical nanofibrous scaffolds fabrication is complicated and not perfectly suitable for further biomedical application in view of both structure and function. In this study, we constructed a hierarchical nanofibrous poly (l-lactic acid)/poly(ε-caprolactone) (PLLA/PCL) scaffold and further evaluated its bone healing ability. The hierarchical PLLA/PCL nanofibrous scaffold (PLLA/PCL) was prepared by one-pot TIPS and then rapidly mineralized at room temperature by an electrochemical deposition technique. After electrode-positioning at 2 V for 2 hrs, a scaffold coated with hydroxyapatite (M-PLLA/PCL) could be obtained. The pore size of the M-PLLA/PCL scaffold was hierarchically distributed so as to match the biophysical structure for osteoblast growth. The M-PLLA/PCL scaffold showed better cell proliferation and osteogenesis activity compared to the PLLA/PCL scaffold. Further in vivo bone repair studies indicated that the M-PLLA/PCL scaffold could accelerate defect healing in 12 weeks. The results of this study implied that the as-prepared hydroxyapatite coated hierarchical PLLA/PCL nanofibrous scaffolds could be developed as a promising material for efficient bone tissue repair after carefully tuning the TIPS and electrodeposition parameters.