四嗪二甲酰胺对肺癌细胞株A549的体内外作用

为了观察四嗪二甲酰胺(ZGDHu-1)体外抑制肺癌细胞株A549增殖、诱导细胞凋亡和体内抗肿瘤活性的作用及其机制，将不同浓度的ZGDHu-1与A549细胞在体外培养，用台盼蓝染色、SRB法、5′-溴-2′脱氧尿苷-ELISA法，观察ZGDHu-1对A549细胞增殖的作用；用细胞形态学、DNA凝胶电泳、DNA含量及细胞周期分析、Annexin V/PI双标记、Hoechst 33258荧光染色等技术检测细胞凋亡。腹腔注射ZGDHu-1后观察其对裸鼠移植瘤生长的抑制作用。用RT-PCR和流式细胞术观察A549细胞bcl-2，bax，p53基因和蛋白质的表达改变。结果表明，ZGDHu-1能抑制A549细胞的增殖和活力，呈现作用时间和剂量的依赖关系。A549细胞经ZGDHu-1作用后，大部分细胞阻滞于G₂-M期；出现DNA片段化，亚G₁峰显著增加，Annexin V+/PI-表达升高，Hoechst 33258荧光染色后出现凋亡细胞的特征性改变等。ZGDHu-1以10，20及40 mg·kg^-1剂量给裸鼠体内用药14 d后，移植瘤生长抑制率分别为43.7%，56.9%和60.0%。A549细胞经ZGDHu-1作用后，bcl-2基因和蛋白有所下调，但主要是上调bax基因和蛋白，导致bax/bcl-2比值明显增高，p53基因和蛋白表达也上调，均呈现剂量依赖性。ZGDHu-1在体内能明显抑制移植瘤的生长，体外通过诱导细胞凋亡抑制A549细胞增殖，其机制可能与上调bax和p53基因的表达有关。

Effect of ZGDHu-1 on proliferation and apoptosis of A549 cells in vitro and antitumor activity in vivo

This study is to explore the mechanism and effect of N,N′-di-(M-methylphenyl)-3,6-dimethyl-1,4-dihydro-1,2,4,5-tetrazine-1,4-dicarboamide (ZGDHu-1) on proliferation and apoptosis of A549 cells in vitro and on A549 xenograft tumor in nude mice. With different concentrations of ZGDHu-1 at different times were used to treat A549 cells in vitro. The proliferation was determined by living cell count, SRB assay and Brdu-ELISA. Cell apoptosis was determined by cell morphology, DNA agarose gel electrophoresis, DNA content, Annexin V/PI and Hoechst 33258 labeling method. The nude mice model of A549 xenograft tumor was established by subcutaneous inoculation. The suppression activity of ZGDHu-1 by intraperitoneal injection on xenograft mice model was detected. The expressions of bcl-2, bax and p53 gene and protein were analyzed by RT-PCR and flow cytometry. ZGDHu-1 can inhibit A549 cell proliferation viability within a certain range of treating time and does, and a majority of A549 cells were arrested in G₂-M phase. The A549 cells apoptosis was confirmed by typical cell morphology, DNA fragment, Sub G₁ phase, Hoechst 33258 and Annexin V/PI labeling method with a time and dose related manner. When the xenograft tumor mice model were treated with 10, 20 and 40 mg·kg^-1 ZGDHu-1 for 14 days, the tumor growth inhibition rate were 43.7%, 56.9% and 60.0%, respectively. The expression of bax, bax/bcl-2 and p53 gene and protein increased significantly and bcl-2 decreased slightly by the treatment of ZGDHu-1. ZGDHu-1 can significantly suppress the growth of A549 xenograft tumor in vivo and inhibited proliferation by inducing tumor cell apoptosis in vitro. The mechanism may associate with its up-regulation of bax and p53 during the apoptosis process.