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Zinc can enhance osteoblastic bone formation and stimulate osteogenic differentiation, suppress the differentiation of osteoclast precursor cells into osteoclasts, and inhibit pathogenic bacterial growth in a dose-dependent manner. In this study, simonkolleite, as a novel zinc resource, was coated on poly (amino acids) (PAA) via suspending PAA powder in different concentrations of zinc chloride (ZnCl 2 ) solution, and the simonkolleite-coated PAA (Zn-PAA) was characterized by SEM, XRD, FT-IR and XPS. Zinc ions were continuously released from the coating, and the release behavior was dependent on both the concentration of the ZnCl 2 immersing solution and the type of soak solutions (SBF, PBS and DMEM). The Zn-PAA was cultured with mouse bone marrow stem cells (BMSCs) through Transwell TM plates, and the results indicated that the relative cell viability, alkaline phosphatase (ALP) activity and mineralization of BMSCs were significantly higher with Zn-PAA as compared to PAA. Moreover, the Zn-PAA was cultured with RAW264.7 cells, and the results suggested an inhibiting effect of Zn-PAA on the cell differentiation into osteoclasts. In addition, Zn-PAA exhibited an antibacterial activity against both S. aureus and E. coli . These findings suggest that simonkolleite coating with certain contents could promote osteogenesis, suppress osteoclast formation and inhibit bacteria, indicating a novel way of enhancing the functionality of synthetic bone graft material and identifying the underline principles for designing zinc-containing bone grafts.

Simonkolleite Coating on Poly(Amino Acids) to Improve Osteogenesis and Suppress Osteoclast Formation in Vitro