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辐射诱导性自杀基因在胰腺癌细胞中的表达 被引量:2

Expression of the radio-inducible TK suicide gene controlled by Egr-1 promoter in pancreatic cancer cells: an in vitro experiment
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摘要 目的利用辐射敏感的早期生长反应基因1(Egr-1)启动子驱动单纯疱疹病毒胸苷激酶基因(HSV-TK),观察其在胰腺癌细胞中的表达效果。方法以细菌内同源重组法构建含绿色荧光蛋白(GFP)做标志基因的TK基因的腺病毒载体pAdEgr-1-TK,转染人胰腺癌细胞系PC-360Co-γ射线照射后,逆转录聚合酶链反应(RT—PCR)半定量分析各不同照射剂量组TK基因的mRNA表达。Western印迹法分析60Co-γ射线照射后转染pAdEgr-1-TK细胞中TK蛋白质的表达量。结果重组腺病毒载体pAdEgr-1-TK转染胰腺癌细胞系PC-3,不同剂量60Co-γ射线照射后,经RT-PCR半定量分析,TKmRNA表达结果分别为0Gy(67.3±2.1)%、5Gy为(89.3±1.0)%、7.5Gy为(114.7±5.7)%、10Gy为(140.5±3.1)%、15Gy为(134.5±4.0)%、20Gy为(117.4±3.4)%,各照射组TKmRNA表达均明显高于对照组0Gy(均P〈0.01),尤以剂量为10.0Gy时最为显著。Western印迹分析结果分别为0Gy为(5.4±0.7)%,5Gy为(7.6±0.9)%,7.5Gy为(21.5±1.5)%,10Gy为(35.7±1.4)%,15Gy为(32.1±1.2)%,20Gy为(28.8±1.5)%,60Co-γ射线照射可明显提高转染pAdEgr-1-TK细胞中TK的蛋白质表达量,且蛋白质表达量与辐射剂量呈正相关性。结论放射敏感性启动子Egr-1基因可驱动TK自杀基因在胰腺癌细胞中高效表达。 Objective To investigate the expression of radio-inducible herpes simplex virus thymidine kinase (TK) suicide gene controlled by early growth response-1 (Egr-1) promoter in pancreatic cancer cells. Methods Adenoviral vector pAdEgr-1-TK containing green fluorescent protein (GFP) was constructed. Human pancreatic cancer cells of the line PC-3 were cultured, transfected with pAdEgr-1-TK, and then exposed to 60Co source γ-radiation at the doses of 0, 5, 7.5, 10, 15, and 20 Gy respectively for 24 hours. RT-PCR and Western blotting were used to detect the TK mRNA and protein expression in the PC3 cells. Results The TK mRNA expression levels of the PC3 cells exposed to γ-radiation at the doses of 0, 5, 7. 5, 10, 15, and 20 Gy respectively were (67.3±2.1)%, (89.3±1.0)%, (114.7±5.7)%, ( 140. 5 ± 3.1 ) %, ( 134. 5 ± 4. 0) %, and ( 117.4 ± 3.4) % respectively. The TK mRNA expression level was markedly increased after exposure to 7-radiation, especially that t the dose of 10 Gy ( all P 〈 0. 01 ). The TK protein expression levels of the PC3 cells exposed to γ-radiation at the doses of 0, 5, 7.5, 10, 15, and20 Gywere (5.4±0.7)%, (7.6±0.9)%, (21.5±1.5)%, (35.7±1.4)%, (32.1 ±1.2)%, and (28.8 ±1.5 ) % respectively. Conclusion The Egr-1 promoter causes high expression of TK suicide gene in cancer cells after exposure to 60Co-γ-radiation. These data provide an experimental basis for gene therapy.
出处 《中华医学杂志》 CAS CSCD 北大核心 2008年第28期1952-1955,共4页 National Medical Journal of China
基金 国家自然科学基金资助项目(30471691)
关键词 胰腺肿瘤 基因疗法 腺病毒载体 Pancreatic neoplasms Gene therapy Adenovirus vector
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