GDF11对肝细胞癌SMMC-7721细胞增殖能力及顺铂敏感度的影响

目的 研究GDF11（growth differentiation factor 11）过表达对肝细胞癌SMMC-7721细胞体外增殖能力及顺铂敏感度的影响。方法 前期成功构建GDF11过表达的SMMC-7721细胞，同时以空载体感染细胞组及野生型细胞组为对照。CCK-8法检测细胞增殖能力，平板克隆形成实验检测细胞克隆形成能力。CCK-8法检测GDF11过表达对细胞顺铂药物敏感度的影响。结果 Western blot结果验证，已成功构建GDF11过表达的SMMC-7721细胞。GDF11过表达可明显抑制SMMC-7721细胞的体外增殖能力，在96、120及144 h时抑制作用最显著（P<0.05），且实验组细胞较对照组克隆形成能力明显减弱（P<0.05）。GDF11过表达能够增强肝细胞癌SMMC-7721细胞对顺铂的敏感度，顺铂浓度取20 μg/ml及40 μg/ml时，与对照组相比差异有统计学意义（P<0.05）。结论 肝细胞癌SMMC-7721细胞过表达GDF11蛋白后，其体外增殖及克隆形成能力明显降低，对化疗药物顺铂的敏感度增强。

GDF11 is Involved in Human Hepatic Carcinoma Cells SMMC-7721 Proliferation and Sensitivity to DDP

Objective To explore the influence of growth differentiation factor 11 (GDF11) overexpression on hepatic carcinoma cells SMMC-7721 proliferation ability and sensitivity to DDP in vitro. Methods Previous study had successfully built SMMC-7721 cells with GDF11 over-expression. Meanwhile, empty vector infected cells and wild-type cells were treated as controls. Cells proliferation ability was examined by CCK-8 assay, and the proliferation curve was calculated. Colony formation assay was adopted to evaluate colony formation ability. The SMMC-7721 cells were treated with various concentrations of DDP, then the cell viability was measured using CCK-8 assay. Results Western blot showed SMMC-7721 cells with GDF11 over-expression had successfully built. The overexpression of GDF11 could significantly inhibit the proliferation of SMMC-7721 cells in vitro, and the effect were significant at 96, 120, 144h (P<0.05). Meanwhile GDF11 over-expression group had lower ability of colony formation than control groups(P<0.05). The over-expression of GDF11 made SMMC-7721 cells more sensitive to DDP, and the effect were significant at 20 and 40μg/ml DDP (P<0.05).Conclusion The over-expression GDF11 could inhibit the proliferation and colony formation abilities of SMMC-7721 cells, and enhance its sensitivity to DDP.