目的 探討齊墩果酸對人肝癌HepG2細胞增殖的抑制作用和誘導凋亡作用，并考察其作用機制。方法 采用MTT法檢測齊墩果酸對HepG2細胞增殖的影響，吖啶橙/溴化乙錠（AO/EB）雙重染色法進行細胞形態(tài)學觀察，流式細胞儀檢測細胞凋亡、活性氧（ROS）水平和線粒體膜電位（MMP）的變化。結果 隨著齊墩果酸濃度的升高，抑制率顯著增加，呈現明顯的時間與劑量相關性；齊墩果酸在25.0、50.0、100.0 μmol/L作用12 h時，細胞形態(tài)學發(fā)生改變，細胞的總凋亡率隨著齊墩果酸濃度的增加而升高，細胞中ROS水平隨著齊墩果酸濃度的增加而升高，細胞內的MMP水平隨著齊墩果酸濃度的增加而降低。結論 齊墩果酸通過調節(jié)ROS和MMP體外抑制人肝癌HepG2細胞的增殖和誘導其凋亡

Objective To investigate the effect of oleanolic acid on proliferative inhibition and apoptotic induction against HepG2 cells, and explore its mechanism. Methods The cell inhibitory rates of oleanolic acid on HepG2 cells were assessed by MTT assay. The morphology of HepG2 cells was observed by acridine orange/ethidium bromide (AO/EB) double staining. The rate of apoptosis, change of reactive oxidative species (ROS) level, and mitochondrial membrane potential (MMP) were measured by flow cytometer method. Results The proliferation of HepG2 cells was inhibited by oleanolic acid with higher concentrations in a dose and time dependent manner. After be treated with oleanolic acid (25, 50, and 100 μmol/L) for 12 h, the morphology changes of cell apoptosis significantly observed, total apoptotic rates of HepG2 cells were increased, and level of ROS were obviously increased, while MMP were decreased. Conclusion Oleanolic acid can inhibit the proliferation and induce apoptosis in HepG2 in vitro, which is related to change of ROS and MMP.

國家自然科學基金資助項目（81101687）