中文摘要：

目的 研究四嗪二甲酰胺（ZGDHu-1）诱导肺癌细胞株EBC-1凋亡的作用及分子机制.方法 将不同浓度的ZGDHu-1与EBC-1细胞在体外培养,采用5′-溴-2′脱氧尿苷（BrdU）-酶联免疫吸附法（ELISA）观察ZGDHu-1对EBC-1细胞的增殖抑制作用 采用Annexin V/PI双标记染色与ELISA法测定凋亡细胞核小体等技术检测ZGDHu-1诱导EBC-1细胞凋亡的作用 采用流式细胞术检测经ZGDHu-1作用后EBC-1细胞磷酸化p38MAPK和Stat3表达的变化 采用Western blot法检测Bcl-2、Bax、Fas、p53、caspase-3蛋白表达的变化.结果 ZGDHu-1能抑制EBC-1细胞增殖,并呈现作时间和剂量依赖性,作用24、48和72 h后的IC50分别为（295±25）ng/ml、（112±8）ng/ml和（23±2）ng/ml.经ZGDHu-1作用后,EBC-1细胞中的Annexin V＋/PI-细胞升高,细胞内核小体含量显著增加,二者均呈现剂量依赖性.EBC-1细胞与50、200和500 ng/ml的ZGDHu-1培养48 h后,磷酸化p38MAPK的表达率分别为67.4%、88.2%和91.1%,空白对照组为10.6% 而磷酸化Stat3的表达率分别为56.5%、43.6%和34.6%,空白对照组为89.1%.Western blot检测结果显示,随药物作用浓度的升高,Bax、Fas和p53蛋白的表达显著上调,Bcl-2的表达没有变化,caspase-3蛋白的表达则明显下调.结论 ZGDHu-1能显著抑制EBC-1细胞增殖,并诱导其凋亡.Fas介导的线粒体途径可能是ZGDHu-1诱导EBC-1细胞凋亡的通路之一,p38MAPK和Stat3激活也参与了ZGDHu-1诱导EBC-1细胞凋亡的过程.

英文摘要：

Objective To study whether N,N′-di-（m-methylphenyi）-3,6- dimethyl-1,4-dihydro-1,2,4,5-tetrazine-1,4-dicarboamide（ZGDHu-1）inhibits proliferation and induces apoptosis in human lung carcinoma cell line EBC-1 cells and its molecular mechanism. Methods Different concentrations of ZGDHu-1 and different times of culture were used to treat EBC-1 cells in vitro. Thc inhibition of proliferation was measured by BrdU-ELISA. Cell apoptosis was detected by Annexin V/PI staining and cellular DNA fragmentation ELISA. Phosphorylated p38MAPK and STAT3 were examined by flow cytometry. The protein expressions of bcl-2, bax, p53, Fas, and caspase-3 were detected by Western blot analysis. Results ZGDHu-1 inhibited EBC-1 cell proliferation within a certain range of treating times and does, with a 24 h IC50 of （295 ± 25）ng/ml, 48 h of（112 ± 8）ng/ml and 72 h of（23 ± 2）ng/ml. The EBC-1 cell apoptosis was confirmed by Annexin V/PI labeling and cellular DNA fragmentation ELISA in a dose-related manner. When EBC-1 cells were treated with 50,200, and 500 ng/ml ZGDHu-1 for 48 h, the expression rates of phosphorp38MAPK protein were 67.4%, 88.2%, 91.1%, respectively, and that of the control was 10.6%. That of STAT3 protein were 56.5%, 43.6% and 34.6%, respectively, and that of the control was 89.1%. The expression of bax, p53 and Fas protein was significantly increased, that of bcl-2 was not changed, and that of caspase-3 was significantly decreased by the ZGDHu-1 treatment. Conclusion ZGDHu-1 can inhibit proliferation and induce apoptosis in EBC-1 cells. The mitochondrial pathway mediated by Fas may be one of its mechanisms. The apoptosis of EBC-1 cells may associate with up-regulation of phosphor-p38MAPK and down-regulation of phosphor-STAT3 in the cells.