半枝莲提取物抗人肝癌Hep-G2细胞增殖及其机制研究

Effect of Scutellaria barbata extract against human hepatocellular Hep-G2 cell proliferation and its mechanism

目的探讨半枝莲提取物(ESB)对人肝癌Hep-G2细胞体外增殖的影响及其作用机制。方法以MTT法检测ESB对Hep-G2细胞增殖的影响;光镜、电镜观察ESB作用后Hep-G2细胞形态的变化;流式细胞仪检测ESB作用后Hep-G2凋亡细胞、细胞周期的变化及凋亡相关蛋白Bcl-2,Bax,Fas表达。结果ESB能明显抑制Hep-G2细胞的增殖,并有剂量效应及时间效应关系。ESB作用Hep-G2细胞72h后,呈现凋亡早期的形态学改变;凋亡细胞增多;S期细胞减少,G0/G1期细胞增多;Fas表达增强,Bcl-2及Bax表达变化不明显。结论ESB可抑制Hep-G2细胞增殖,阻滞细胞周期,促进细胞凋亡,可能与激活FNFR超家族有关。

Objective To observe the effects of Scutellaria barbata extract （ESB） on human hepatoma cell line Hep-G2 proliferation in vitro and explore the mechanism. Methods The inhibitory effect of ESB on Hep-G2 proliferation was estimated by MTT assay, and the morphological changes of the cells were observed under optical and electron microscopes. Distribution of cell cycle, cell apoptosis and the protein expressions of apoptosis-associated genes as bcl-2, bax andfas were analyzed using flow cytometry. Results ESB inhibited the proliferation of Hep-G2 cells in a time- and dose-dependent manner. ESB treatment for 72 h resulted in changes of early apoptotic morphology of the cells as observed under optical and the transmission electron microscopes and increased cell apoptosis. Cell cycle analysis revealed decreased S-phase and increased G0/G1-phase cells. Fas expression was significantly up-regulated in response to ESB treatment whereas Bcl-2 and Bax expressions underwent no significant changes. Conclusion ESB can inhibit Hep-G2 cell proliferation, induce cell cycle block, and increase cell apoptosis, which may relate to the activation of FNFR superfamily.