Effects of zinc-containing magnesium alloys on proliferation of human osteosarcoma U2OS cells in vitro / 中国组织工程研究

ABSTRACT

BACKGROUND: Alloying can improve the corrosion resistance and slow the degradation of pure magnesium. In addition, increasing studies have shown that zinc has good antitumor effect. OBJECTIVE: To evaluate the effect of zinc-containing magnesium alloy on the proliferation and apoptosis of human osteosarcoma U2OS cells in vitro.METHODS: The corrosion resistance of pure magnesium and different zinc-containing (2%, 4%, 6%) magnesium alloys were observed and compared by the hydrogen release assay in the Hank's solution. MTT assay was used to examine the effects of different zinc-containing magnesium alloy extractions on the proliferation of U2OS cells (or MC3T3-E1 cells) after co-culture of 1, 3, 5 days. After 24-hour co-culture with pure magnesium, different zinc-containing magnesium alloys and titanium alloy extractions, the apoptotic rates of U2OS cells were analyzed by flow cytometry, and the expression of apoptosis-related proteins were detected by western blot assay.RESULTS AND CONCLUSION: The corrosion resistance of pure magnesium was improved after addition of Zn within the initial 100 hours, and the magnesium alloy containing 4% zinc exhibited the optimal corrosion resistance. Different zinc-containing magnesium alloy extractions obviously inhibited the U2OS proliferation in a zinc level-depended manner, and the cytotoxicity of different zinc-containing magnesium alloy extractions to MC3T3-E1 was graded 0-1. Different zinc-containing magnesium alloy extractions could also induce obvious apoptosis in U2OS cells in a zinc level-depended manner. Different zinc-containing magnesium alloy extractions, especially the magnesium alloy containing 4% zinc, up-regulated the expression of p53 and Bax proteins and down-regulated the expression of Bcl-2 protein in U2OS cells, leading to the disorder of Bcl-2/Bax. These findings suggest that different zinc-containing magnesium alloy extractions can inhibit the proliferation and induce apoptosis of U2OS cells in vitro.