乏氧靶向性自杀基因治疗系统增强胰腺癌放疗效果的实验研究
Hypoxia-targeted suicidal gene therapy system enhances antitumor effects of radiotherapy on pancreatic cancer
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摘要: 目的 探讨乏氧靶向性自杀基因治疗系统对胰腺癌放射治疗的增强效应。方法 借助DNA重组技术构建乏氧依赖性表达的重组腺病毒载体Ad-5HRE/hCMVmp-BCD。用Westernblot检测细菌胞苷脱氨酶(BCD)的表达,细胞生长抑制实验检测人胰腺癌MIA-PACA2细胞对5-氟胞嘧啶(5-FC)的敏感性,裸鼠移植瘤实验观察Ad-5HRE/hCMVmp-BCD/5-FC单独或联合放射治疗对MIA-PACA2细胞移植瘤的杀伤效应。结果 MIA-PACA2细胞感染Ad-5HRE/hCMVmp-BCD后,乏氧处理可诱导BCD蛋白的表达,并显著提高细胞对5-FC的敏感性。裸鼠移植瘤实验结果显示,Ad-5HRE/hCMVmp-BCD/5-FC与放射治疗均可抑制胰腺癌移植瘤的生长,但两者联合可显著增强对移植瘤的抑制效应。结论 乏氧靶向性的Ad-5HRE/hCMVmp-BCD/5-FC自杀基因系统可显著增强胰腺癌细胞的放疗效果,具有良好的临床应用前景。Abstract: Objective To explore the effects of hypoxia-targeted suicidal gene therapy system combined with radiotherapy on pancreatic cancer.Methods The recombinant adenovirus Ad-5HRE/hCMVmp-BCD was constructed by DNA recombinant technique. Western blot was used to detect hypoxia-induced expression of bacterial cytosine deaminase (BCD). Cell growth inhibition assay was used to determine the sensitivity of human pancreatic cancer cells MIA-PACA2 to 5-fluorocytosine (5-FC). Tumor xenograft growth delay assays was used to evaluate the effects of Ad-5HRE/hCMVmp-BCD/5-FC combined with radiotherapy on pancreatic cancer.Results Western blot analysis demonstrated that hypoxia-induced BCD protein expression was achieved in MIA-PACA2 cells infected with Ad-5HRE/hCMVmp-BCD. With hypoxia treatment, the sensitivity of MIA-PACA2 cells infected with Ad-5HRE/hCMVmp-BCD to 5-FC significantly increased. Administration of either Ad-5HRE/hCMVmp-BCD/5-FC or radiotherapy could inhibit the growth of MIA-PACA2 xenografts in nude mice. Moreover, combination of Ad-5HRE/hCMVmp-BCD/5-FC could significantly enhance suppressing effects of radiotherapy on MIA-PACA2 xenografts.Conclusion Hypoxia-targeted suicidal gene therapy system Ad-5HRE/hCMVmp-BCD/5-FC could enhance antitumor effects of radiotherapy on pancreatic cancer and can be used as a powerful adjunct to conventional radiotherapy.
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