可塑形脱矿骨基质/透明质酸骨泥的制备与细胞相容性

Preparation and cell compatibility of malleable demineralized bone matrix/hyaluronic acid putty

背景:应用预制成形的材料修复不规则骨缺损时,常出现材料与骨缺损形状不匹配的问题,制备可任意塑形骨泥对促进不规则骨缺损的愈合具有重要意义。目的:构建可塑形脱钙骨基质/透明质酸骨泥,筛选最佳复合比例并评价其细胞相容性。方法:选取合格供体皮质骨制备脱钙骨基质。分别配置浓度为0.75%,1.5%,3%,4.5%的透明质酸溶液并检测其黏度,以450 mg脱钙骨基质与上述各浓度透明质酸溶液1 mL混合,制备不同比例的脱钙骨基质/透明质酸骨泥。37℃条件下将骨泥浸泡在PBS平衡液中,观察其离散时间,筛选最佳复合比例的脱钙骨基质/透明质酸骨泥。应用脱钙骨基质/透明质酸骨泥浸提液培养L-929小鼠成纤维细胞,1,4,7 d采用CCK-8法检测骨泥的细胞毒性。结果与结论:随透明质酸浓度的增加其溶液黏度增大,脱钙骨基质/透明质酸骨泥的离散时间延长,3%浓度的透明质酸与450 mg脱钙骨基质复合制备的骨泥具有良好可塑形能力,离散时间为8 h,为最佳复合比例。脱钙骨基质/透明质酸骨泥浸提液培养L-929小鼠成纤维细胞1,4,7 d的细胞增殖率分别为93.72%,101.65%,97.68%,细胞毒性级别为0或1级。表明脱钙骨基质/透明质酸复合质量比为15∶1制备的骨泥具有良好的可塑形能力及抗离散能力,细胞毒性轻微。

BACKGROUND： It is important to prepare a malleable putty to repair irregular bone defects because the preformed bone substitute material cannot suit to bone defects.OBJECTIVE： To prepare malleable demineralized bone matrix/hyaluronic acid putty and to screen out the optimal composite ratio, as well as to evaluate its cell compatibility.METHODS： Demineralized bone matrix was prepared from the cortical bone of healthy donors. The hyaluronic acid was dissolved at concentrations of 0.75%, 1.5%, 3%, 4.5%, and the viscosity of them was measured. Then 450 mg demineralized bone matrix was compounded with 1 mL hyaluronic acid solution to prepare the demineralized bone matrix/hyaluronic acid putty, and the optimal ratio of demineralized bone matrix/hyaluronic acid was screened by the disintegrated time of the putty at 37 ℃. L-929 mouse fibroblasts were cultured in the leaching liquor of demineralizedbone matrix/hyaluronic acid, and the cytotoxicity was tested by cell count kit-8 assay at days 1, 4 and 7.RESULTS AND CONCLUSION： With the increase of hyaluronic acid concentration, the viscosity of hyaluronic acid solution was increased; the demineralized bone matrix/hyaluronic acid putty was strengthened and the disintegrated time was prolonged gradually. When the ratio of demineralized bone matrix/hyaluronic acid was 15/1, demineralized bone matrix/hyaluronic acid was molded easily, and the disintegrated time was 8 hours in 7 ℃ PBS. The results of cytotoxicity showed that cell proliferation rates were 93.72%, 101.65% and 97.68% at days 1, 4 and 7 respectively, while the cytotoxicity was in grade 0 or 1. These findings indicate that demineralized bone matrix/hyaluronic acid putty at a compound ratio of 15：1 can be molded easily and difficult to disintegrate, with low cytotoxicity.