黄连解毒汤对人胃癌SGC-803细胞株作用的实验研究

目的:观察黄连解毒汤对人胃癌细胞株SGC-803的作用及其机制。方法:体外培养胃癌细胞株SGC-803,应用黄连解毒汤干预胃癌SGC-803细胞。运用CCK-8实验检测SGC-803细胞增殖;划痕实验检测细胞迁移能力;流式细胞仪检测细胞凋亡水平;qRT-PCR法检测细胞相关基因mRNA的表达水平。结果:CCK-8实验结果表明,黄连解毒汤可有效抑制胃癌MGC-803细胞株的增殖,且呈现出药物浓度依赖性及时间依赖性。划痕实验结果表明,黄连解毒汤干预的实验组细胞迁移率的增长明显慢于对照组,具有统计学差异(P<0.05)。流式细胞术检测细胞凋亡结果显示,黄连解毒汤可以有效促进胃癌细胞的凋亡,实验组MGC-803细胞的细胞凋亡率与对照组相比均有显著性差异(P<0.05)。qRT-PCR结果显示,经黄连解毒汤干预,Bax、Caspase3基因mRNA表达上调,Bcl-2基因mRNA表达下调。结论:黄连解毒汤能够通过诱导SGC-803抑制胃癌细胞MGC-803增殖,抑制胃癌细胞迁移能力,推测其机制可能是通过影响凋亡相关蛋白Bcl-2、Bax的表达,发挥抗肿瘤作用。

Growth inhibitory effect of 4-phenyl butyric acid on human gastric cancer cells is associated with cell cycle arrest

AIM: To investigate the growth effects of 4-phenyl butyric acid (PBA) on human gastric carcinoma cells and their mechanisms. METHODS: Moderately-differentiated human gastric carcinoma SGC-7901 and lowly-differentiated MGC-803 cells were treated with 5, 10, 20, 40, and 60 μmol/L PBA for 1-4 d. Cell proliferation was detected using the MTT colorimetric assay. Cell cycle distributions were examined using flow cytometry.RESULTS: The proliferation of gastric carcinoma cells was inhibited by PBA in a doseand time-dependent fashion. Flow cytometry showed that SGC-7901 cells treated with low concentrations of PBA were arrested at the G0/G1 phase, whereas cells treated with high concentrations of PBA were arrested at the G2/M phase. Although MGC-803 cells treated with low concentrations of PBA were also arrested at the G0/G1 phase, cells treated with high concentrations of PBA were arrested at the S phase. CONCLUSION: The growth inhibitory effect of PBA on gastric cancer cells is associated with alteration of the cell cycle. For moderately-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and G2/M phases. For lowly-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and S phases.

大蒜素诱导人胃癌细胞M期阻滞的研究

目的探讨大蒜素对人胃癌细胞系MGC803和SGC7901细胞周期的影响及其作用机制。方法以台盼蓝拒染法检测人胃癌细胞系MGC803和SGC7901细胞的增殖抑制率;以透射电镜观察两种胃癌细胞的直接损伤改变;以流式细胞仪及瑞士姬姆萨染色光镜观察两种胃癌细胞周期的改变;以SP免疫组化及RTPCR方法检测两种胃癌细胞的p21WAF1和p16INK4基因及蛋白表达的变化。结果大蒜素可抑制MGC803细胞生长,24h药物半数抑制浓度(IC50)为6.4μg/ml;也可抑制SGC7901细胞的生长,24hIC50为7.3μg/ml。12μg/ml的大蒜素作用两种胃癌细胞24h后,细胞出现急性直接损伤,膜系统改变明显。以3μg/ml、6μg/ml、9μg/ml终浓度大蒜素分别作用于两种胃癌细胞系24h后,与对照组比较,G0和G1期细胞周期百分比(%)明显减少,而G2和M期明显增加(P<0.01);6μg/ml大蒜素作用培养两种胃癌细胞24h后,与对照组比较,细胞分裂指数明显增加,提示两种细胞系经大蒜素处理后,细胞周期阻滞于M期。经大蒜素处理后,MGC803细胞的p21WAF1和p16INK4基因及蛋白表达均明显增加;SGC7901细胞的p21WAF1基因及蛋白表达明显增加。结论大蒜素可使MGC803及SGC7901两种细胞周期阻滞于M期;大蒜素的M期阻滞作用可能与其上调细胞的p21WAF1和p16INK4基因表达有关。