桦木酸对人胃癌MGC-803细胞增殖的影响

目的: 探究不同浓度桦木酸对人胃癌MGC-803细胞增殖的影响。方法: 将人胃癌 MGC-803 细胞分成 4 组,每组设置 3 个复孔,对照组细胞为加入浓度为0 μg /ml的桦木酸实验组细胞分别加入终浓度为10、20、30 μg /ml 的桦木酸,各组细胞在含5%的 CO₂ 培养箱中孵育 48 h 后,使用吉姆萨染色法和台盼蓝拒染法检测桦木酸对细胞克隆形成率和生长抑制率的影响;EdU法和流式细胞术分别检测细胞增殖和细胞周期变化;qRT-PCR和Western blot检测细胞周期调控因子CCNB1、CCND1的表达。结果: 与对照组相比,人胃癌MGC-803的克隆形成率显著降低(P＜0.01),生长抑制率明显升高,细胞增殖能力显著下降(P＜0.01);各实验组细胞随着桦木酸浓度的增加G1 期细胞所占比例逐渐降低, 而S 期细胞数量显著增多(P＜0.01);细胞周期调控因子CCNB1、CCND1 的mRNA和蛋白表达水平均显著降低(P＜0.01),30 μg /ml 的桦木酸处理组的表现最佳。结论: 在终浓度为 10～30 μg /ml 的范围内,桦木酸能够降低人胃癌MGC-803细胞增殖,抑制细胞生长,下调CCNB1和CCND1的表达将人胃癌 MGC-803细胞阻滞于G0/G1 期。

Effect of betulinic acid on proliferation of human gastric cancer MGC-803 cell line

Objective: To investigate the effect of betulinic acid on the proliferation of human gastric cancer MGC-803 cells in vitro. Methods: Human gastric cancer MGC-803 cells were divided into 4 groups, each with 3 multiple holes. Control cells add betulinic acid at a concentration of 0 μg /ml, and the other three experimental groups were added with final concentration of 10, 20, 30 μg/ml Betulinic acid respectively. Cells in each group were incubated in a 5% CO₂ incubator for 48 hours, and the Giemsa staining method and trypan blue exclusion method were used to detect the effect of betulinic acid on the cell clone formation rate and growth inhibition rate; EdU method and flow cytometry were used to detect cell proliferation and cell cycle changes; qRT-PCR and Western blot were used to detect the expressions of cell cycle regulators CCNB1 and CCND1. Results: Compared with the control group, the clone formation rate of human gastric cancer MGC-803 cells was significantly reduced (P＜0.01), the growth inhibition rate was significantly increased, and the cell proliferation ability was significantly decreased (P＜0.01); with the increase of betulinic acid concentration in each experimental group the proportion of cells in the G1 phase was gradually decreased, and the number of cells in S phase was increased significantly (P＜0.01); the mRNA and protein expression levels of cell cycle regulators CCNB1 and CCND1 were decreased significantly, and the 30 μg/ml betulinic acid treatment group performed best. Conclusion: At a final concentration of 10～30 μg/ml, betulinic acid can reduce the proliferation of human gastric cancer MGC-803 cells, inhibit cell growth, and down-regulate the expression of CCNB1 and CCND1 to block human gastric cancer MGC-803 cells in the S phase.