纳米羟基磷灰石复合材料的研究——纳米羟基磷灰石的细胞毒性

Development of nanometer hydroxyapatite complex materials——Cytotoxicity test of nano-hydroxyapatite by MTT-assay

目的 :研究纳米羟基磷灰石的细胞毒性。方法 :采用能快速、准确、敏感地评价细胞增殖率和细胞毒性的MTT比色法 ,以普通HA为对照组 ,纳米HA为实验组 ,选用不同浓度的材料浸提液 ,分别检测小鼠成纤维细胞L 92 9和原代培养的人牙周膜成纤维样细胞的相对增殖率 ,评价其细胞毒性。结果 :与普通HA相比 ,纳米HA表现出较高的细胞增殖率 ,随着浸提液浓度的降低和培养时间的增长 ,细胞毒性趋于 0级 ;纳米HA的微颗粒与细胞的直接接触并未见细胞毒性作用 ;与L 92 9相比 ,原代培养的牙周膜成纤维样细胞的细胞增殖率较低 ,其敏感性较高。结论 :纳米HA无细胞毒性。

Objective: To evaluate the cytotoxicity of nano-hydroxyapatite. Methods: Mouse lung fibroblast L-929 and primary cultured human periodontal ligament fibroblast-like cells (PDLF) were cultured in the medium of extraction of nano-hydroxyapatite or commerce hydroxyapatite at 100%,50%,10% and 0% (control) respectively.Cell growth was tested by MTT assay and the cell relative growth rate (RGR) was calculated.The cytotoxicity was graded by generally accepted standard.Results: RGR of both cell lines cultured in nano-hydroxyapatite extraction was higher than that in control HA. In 7-day culture the cytotoxicity grade of HA was 1 in 100% of HA extraction medium and 0 in 100% of nano-hydroxyapatite extraction,or in 50% and 10% of nano-hydroxyapatite or control HA extraction medium.Primarily cultured PDLF showed lower RGR than L-929 under the same condition. Conclusion: Nano-HA do not have cytotoxic effect.