为探讨ODC和AdoMetDC双反义腺病毒载体(Ad-ODC.AdoMetDCas)对食管癌Eca109细胞凋亡作用的影响,应用MTT法观察Ad-ODC-AdoMetDCas对食管癌Eca109细胞生长增殖的影响,采用Western blot和HPLC的方法分别检测腺病毒载体对食管癌Eea109细胞中ODC和AdoMetDC蛋白表达以及胞内多胺含量的抑制作用,同时应用原位未端标记(TUNEL)法观察Ad-ODC-AdoMetDCas对食管癌Eca109细胞凋亡作用的影响,透射电镜进一步观察细胞超微结构的改变.实验结果显示,应用MTT法观察发现Ad-ODC-AdoMetDCas对食管癌Eca109细胞生长增殖有显著抑制作用. 以Ad-ODC-AdoMetDCas感染食管癌Eca109细胞,可明显抑制食管癌Eca109细胞中ODC和AdoMetDC基因表达.HPLC结果显示,食管癌Eea109细胞感染Ad-ODC-AdoMetDCas后,细胞内3种多胺含量都明显降低.TUNEL标记检测结果显示Ad-ODC-AdoMetDCas可明显引起食管癌Eca109细胞凋亡.透射电镜观察到典型的细胞凋亡特征(表现细胞体积缩小,核皱缩、碎裂,染色质呈块状边集等).实验表明,ODC和AdoMetDC双反义腺病毒载体(Ad-ODC-AdoMetDCas)具有显著抑制食管癌细胞生长增殖,降低细胞多胺合成,促进细胞凋亡,为探讨食管癌基凶治疗的可行性提供实验依据.%Polyamine biosynthesis is controlled primarily by omithine Decarboxylase (ODC) and S-adenosylmethionine decarboxylase (AdoMetDC). Antisense ODC and AdoMetDC sequences were cloned into an adenoviral vector (Ad-ODC-AdoMetDCas). To study the inhibitory effects of Ad-ODC-AdoMetDCas on polyamine biosynthesis and esophageal cancer cell apoptosis, adenovirus-mediated gene tmnsduction efficiency was assessed with counting GFP-positive cells using MTT. The malignant phenotype of Eca109 cells was assessed by growth curve. Western blot and HPLC were used to detect ODC and AdoMetDC expression and polyamine content in Ecal09 cells. TUNEL was used to analyze cell apoptosis. The change of morphology of apoptotic cells was observed by electron microscope. It was demonstrated approximate 70% of Eca 109 cells were infected with Ad-ODC-AdoMetDCas when MOI reached 50. The expression of ODC was inhibited in the infected tumor cells. Ad-ODC-AdoMetDCas could inhibit Ecal09 cell growth and invasive ability. TUNEL proved that Ad-ODC-AdoMetDCas can lead to cell apoptosis. Characterized morphology was observed by electron microscope (ehromatin condensation, nuclear disintegration, formation of apoptotic bodies). It was suggested Ad-ODC-AdoMetDCas has significant inhibitory effects on esophageal cancer cell proliferation, leads to cell apoptosis and bears therapeutic potential for the treatment of esophageal cancer.
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