中文摘要：

目的：探讨镰形棘豆提取物的体内外抗肝癌活性，并探讨其可能的机制。方法：采用MTT法检测镰形棘豆提取物对SMMC-7721细胞的增殖抑制，采用PI单染法和AnnexinV-FITC／PI双染法进行流式细胞仪检测，测定细胞周期和凋亡率，观察H22荷瘤小鼠的体内肿瘤抑制作用。结果：MTT实验表明，镰形棘豆提取物EOOF和FOF有效抑制肿瘤细胞SMMC-7721的增殖，并呈一定的剂量依赖性，其IC50值分别为0．115和0．097mg·mL^-1。TFOF作用SMMC-7721细胞后可使细胞周期停滞于G1期，凋亡细胞的比例升高，并且呈浓度依赖性。镰形棘豆提取物FOF能明显抑制H22荷瘤小鼠肿瘤的生长，低、高剂量组的抑制率分别为56．1％和70．8％（P〈0．01）。结论：镰形棘豆提取物FOF能抑制SMMC-7721细胞的增殖，诱导其凋亡，并对H22荷瘤小鼠有肿瘤生长抑制作用。显示镰形棘豆具有较好的发展为抗肝癌药物的前景。

英文摘要：

AIMS： To investigate the antitumor effects of extracts from Oxytropis falcata on human hepatocellular carcinoma SMMC-7721 cells in vitro and in transplanted murine H22 tumors in vivo. METHODS： Cell proliferation, cell cycle distribution and apoptosis in SMMC-7721 cells were determined and tumor growth inhibition in H22 tumors was investigated. Cell cycle distribution was analyzed by flow cytometry with propidium iodide （PI） and Annexin V-FITC/ PI double staining. RESULTS： MTT assay revealed that essential oil and flavonoids of O. falcata （named EOOF and FOF） inhibited proliferation of SMMC-7721 cells in a dose-dependent manner. The IC50 value of EOOF and FOF were 0.115 and 0.097 mg.mL-1, respectively. Cell cycle was arrested at G1 phase, and induction of apoptosis occurred in SMMC-7721 cells when subjected to FOF. Growth inhibition in H22 solid tumors transplanted mice was significantly pronounced after being treated with FOF, and the inhibition ratio were 56.1% and 70.8% at the concentration of 30 and 60 mg.kg-1. CONCLUSION： The results suggest that FOF promotes apoptosis in SMMC-7721 cells and inhibits H22 tumor growth, resulting in a potential antitumor effect on hepatic cancer.