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脱氧核酶的可视化筛选及其抑制鼻咽癌EBV-LMP1基因表达的实验研究

The Visible Screening of Dnazymes and Their Inhibition of Latent Membrane Protein-1 Gene Expression in Nasopharyngeal Carcinoma

【作者】 杨玉成

【导师】 洪苏玲;

【作者基本信息】 重庆医科大学 , 外科学, 2006, 博士

【摘要】 鼻咽癌是我国高发肿瘤,国内外一系列研究证明EB病毒编码的LMP1对其发生发展中起重要作用,被认为是鼻咽癌的癌基因。目前,脱氧核酶是基因治疗的一种崭新的分子生物学工具,能够将RNA分子在未配对的嘌呤和配对的嘧啶之间切断,从而调控基因的表达。本研究针对LMP1 mRNA设计合成10-23型脱氧核酶(10-23 DRz),观察其在细胞内外筛选的差异性及其抑制鼻咽癌EBV-LMP1基因表达的效应。希望建立一个脱氧核酶简便可行的的荧光可视化筛选方法,并为鼻咽癌的预防和临床治疗开创一个新的方法。目的:1、调查研究我国西部重庆地区鼻咽癌患者及非鼻咽癌对照者外周血血浆中EB病毒LMP1基因携带情况及LMP1基因C端30个碱基缺失和N端Xho I酶切位点缺失变异情况。为进一步探讨具有缺失型LMP1的EBV与鼻咽癌的相关性提供实验依据。2、选择EBV-LMP1基因为脱氧核酶治疗鼻咽癌的靶基因,针对EBV-LMP1 mRNA设计合成多种10-23 DRz,并对其转染效率及其在细胞内的分布情况进行评价。3、通过体外转录技术,经细胞外分子水平切割筛选具有高效性和

【Abstract】 Nasopharyngeal carcinoma (NPC) is a common human malignancy in China. Latent membrane protein-1(LMP1) of Epstein-Barr virus (EBV) plays a significant role in the pathogenesis of NPC and is regarded as the oncogene of NPC. DNAzyme(DZ) is a novel molecular biological tool which could cut RNA substrate between an unpaired purine and a paired pyrimidine residue to regulate the expression of target genes. Our research aimed at 1) synthesizing series of 10-23 DNAzymes(10-23DRz) against the LMP1 mRNA 2)investigating the cleavage variability of DNAzymes in vitro 3)detecting the inhibitive effect of LMP1 gene expression by special DNAzyme 4)establishing a visible system to estimate the cleavage ability of DNAzymes and 5)starting a novel therapeutic method in NPC.Objective:1. To investigate the existence of EBV-LMP-1 gene from plasma in both NPC and non-NPC patients in Chongqing province, western China and the loss of an Xho I-site within N-terminal region and a 30bp deletion in

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