Objective To investigate the effect of emodin on proliferation and cell cycle distribution of human oral squamous carcinoma cells in vitro. Methods Cultured human oral squamous carcinoma Tca8113 cells were treated with 2.5, 5, 10, 20, 40, 60 and 80μmol/L emodin for 24, 48 or 72 h, with the cells treated with 0.1%DMSO as control. MTT assay and flow cytometry were used to evaluate the changes in cell proliferation and cell cycle distribution, respectively. Western blotting was employed to analyze the changes in the expression levels of the cell cycle-related proteins CDK2, cyclin E and P21 after emodin treatment. Results Emodin significantly inhibited the growth and proliferation of Tca8113 cells within 72 h in a time-and dose-dependent manner, and caused cell cycle arrest in G0-G1 phase. Western blotting revealed that emodin treatment significantly lowered the expression levels of CDK2, cyclin E and P21 proteins in Tca8113 cells (P<0.05). Conclusion Emodin can inhibit the proliferation of Tca8113 cells and affect their cell cycle distribution possibly by inhibiting the signaling pathways of cell cycle regulation.%目的：探讨大黄素对人口腔鳞癌细胞体外生长增殖及细胞周期改变的影响。方法采用2.5、5.0、10、20、40、60和80μmol/L大黄素分别干预体外培养的口腔鳞癌细胞Tca8113，作用24、48和72 h后，并设含0.1%二甲基亚砜的培养液作为对照组，通过MTT检测不同浓度大黄素干预对于口腔鳞癌细胞Tca8113的增殖作用；以FCM检测不同浓度大黄素干预对于口腔鳞癌细胞周期的影响；结合Western blotting方法分析大黄素干预后对口腔鳞癌细胞周期相关蛋白CDK2、Cyclin E和P21表达水平的变化。结果大黄素能够在72 h内明显抑制Tca8113细胞生长以及增殖行为。MTT结果显示，随作用时间从24、48到72 h，大黄素对于Tca8113细胞的抑制效应呈明显的时间—浓度依赖关系；由细胞周期检测结果显示，大黄素作用使口腔鳞癌Tca8113细胞周期表现为G0~G1期细胞时相阻滞；蛋白免疫印迹则表明经大黄素干预口腔鳞癌Tca8113细胞的细胞周期相关蛋白CDK2、Cyclin E和P21表达水平明显降低，与空白对照组相比较，具有显著的统计学差异（P<0.05）。结论大黄素能够明确抑制人口腔鳞癌细胞Tca8113的生长增殖以及影响其细胞分裂周期，这可能与抑制细胞周期调控信号通路中分子的活化与转导有关。
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