Ad-CEA-E1A -ZD55-ST13 诱导结肠癌细胞系的凋亡
首发时间:2008-10-14
摘要:结肠癌是一种最常见的恶性肿瘤。癌胚抗原( CEA )是使用最广泛的肿瘤标记,特别是在结肠癌患者中。本研究中,成功构建重组腺病毒Ad-CEA-E1A-ZD55,利用癌胚抗原启动子控制E1A并且删除E1B 区55kD的基因。研究表明,ST13 (tumorigenecity 13)具有良好的抑制肿瘤增殖的作用。因此,我们将ST13 插入到Ad-CEA-E1A-ZD55中,成功构建Ad-CEA-E1A-ZD55-ST13 ,并构建带有绿色荧光蛋白的对照病毒Ad-CEA-E1A-ZD55-EGFP。在体外实验中表明:Ad-CEA-E1A-ZD55-ST13能够抑制结肠癌细胞( SW620 , HT29 和HCT116 )的增殖,但是对正常胚肺成纤维细胞MRC5几乎没有任何损伤。进一步研究Ad-CEA-E1A-ZD55-ST13抑制肿瘤细胞增殖的机制发现:Ad-CEA-E1A-ZD55-ST13感染的HCT116细胞形成凋亡小体并出现明显的细胞凋亡现象。Ad-CEA-E1A-ZD55-ST13上调caspase – 3,caspase - 8和聚( ADP -核糖)聚合酶(PARP)表达 ,并促进细胞色素c的释放。最终,通过激活caspase – 3和caspase – 9剪切PARP诱导肿瘤细胞凋亡。总之,体外研究表明我们的基因病毒疗法具有明显的抗肿瘤作用,并将实现对结肠癌的个性化治疗。
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Colorectal cancer cells apoptosis induced by Ad-CEA-E1A -ZD55-ST13
Abstract:Colorectal cancer (CRC) is one of the most commonly occurred malignant tumors. Carcinoembryonic antigen (CEA) is the most widely used tumor maker, especially in CRC patients. In the present study, a recombinant adenovirus (Ad-CEA-E1A-ZD55) was constructed in which E1A is driven by a CEA promoter and E1B 55-kDa gene deleted (ZD55). It was demonstrated that suppression tumorigenecity 13 (ST13) cloned in ZD55 possessed in good growth tumors. So, we inserted ST13 into Ad-CEA-E1A-ZD55 to form Ad-CEA-E1A-ZD55-ST13 and constructed a control Ad-CEA-E1A-ZD55-EGFP. In vitro Ad-CEA-E1A-ZD55-ST13 inhibited proliferation of CRC cells (SW620, HT29, and HCT116) more than Ad-CEA-E1A-ZD55-EGFP and showed almost no damage to normal lung fibroblast MRC5 cells. In exploring the mechanism of Ad-CEA-E1A-ZD55-ST13 in tumor cell killing. It was found that Ad-CEA-E1A-ZD55-ST13-infected HCT116 cells formed apoptotic bodies and presented obvious apoptosis phenomena. Ad-CEA-E1A-ZD55-ST13 induced the up-regulation of caspase-3, caspase-8, poly (ADP-ribose) polymerase (PARP), and the release of cytochrome c. Cytochrome c finally triggered apoptosis by activating caspase-9, -3, which cleaves the PARP in Ad-CEA-E1A-ZD55-ST13-infected HCT116 cells. In summary, our gene-virotherapy has antitumor activity in vitro and has become an accurate strategy for CRC therapy.
Keywords: CRC CEA promoter ST13 ZD55
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No.2475633389912239****
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