Mineralization of collagen-coated electrospun poly(lactide-co-glycolide) nanofibrous mesh to enhance growth and differentiation of osteoblasts and bone marrow mesenchymal stem cells

Abstract

To obtain the biomimetic scaffolding materials for bone tissue engineering, poly(lactide-co-glycolide) (PLGA) nanofibrous mesh (NFM) was mineralized in a 5× simulated body fluid (SBF) for different time after it was treated by air plasma for 15 min and subsequent collagen coating. The apatite particles were nucleated on the surface of individual nanofibers, gradually grew up, and finally covered the whole NFM surface. The mineral aggregates were mainly composed of tiny hydroxyapatite (HA) nanoparticles, whose content reached a constant value of 54 μg · cm -2 after 9 days. The collagen coating and apatite deposition enhanced the NFM strength pronouncedly too. In vitro cell culture demonstrated that the non- or less mineralized NFMs were more beneficial of cell spreading and proliferation than those highly mineralized NFMs, but the latter ones could strongly promote secretion of alkaline phosphatase (ALP) by osteoblasts after cultured for 14 days. Moreover, the highly mineralized NFMs also could significantly up-regulated ALP activity and calcium synthesis of bone marrow mesenchymal stem cells (BMSCs), demonstrating that these NFMs are more favorable of the osteoblast phenotype expression and osteogenic induction. Therefore, the biomimetic apatite deposited PLGA/collagen NFM could be a promising candidate scaffold for bone tissue engineering. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.