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放射疗法是治疗恶性肿瘤的主要手段之一, 近年来发展较快, 但仍存在肿瘤辐射抗性和放疗对周边正常组织的一系列不良反应等问题。为优化治疗方案, 基因治疗和放射治疗相结合的方法已成为研究热点, 其含义是将同时具有肿瘤杀伤和辐射诱导特性的基因导入体内, 在对肿瘤实施局部放疗的同时诱导肿瘤杀伤基因的表达, 形成射线和基因对肿瘤的双重杀伤作用。早期生长反应基因1(early growth response gene-1, Egr-1)是一种即刻早期基因, 其启动子可感受自由基、电离辐射等理化刺激, 继而诱导自身及下游基因表达。将Egr-1与相应目的基因结合而构成辐射诱导基因表达调控系统, 为解决长期困扰肿瘤放疗的两个棘手问题——肿瘤的辐射抗性和受照部位周边正常组织的损伤开辟了新途径。
早期生长反应基因1启动子介导肿瘤基因-放疗的研究进展
The progress of tumor gene-radiotherapy induced by Egr-1 promoter
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摘要: 早期生长反应基因1(Egr-1)启动子为Egr-1上游的顺式作用元件,其活性受电离辐射、自由基等诱导剂的调控。Egr-1与治疗基因结合(如肿瘤坏死因子α基因、自杀基因等)构成基因-放射治疗体系,利用辐射在肿瘤局部从时间、空间调控治疗基因的表达,使表达产物局限于肿瘤局部发挥肿瘤杀伤效应,并降低了不良反应。放射治疗与基因治疗的结合为肿瘤治疗提供了新方法。Abstract: The promoter of early growth response gene-1(Egr-1) is a cis-acting element of Egr-1, and its activity is regulated by inducers such as ionizing radiation, free radical.In designated gene-radiotherapy system, radiation combined with therapeutic gene (such as tumor necrosis factor-αgene, suicide gene) can spatially and temporally regulate therapeutic gene expression in the irradiated field, produced a marked effect, while little systemic toxicities were observed.The combination of radiotherapy and gene therapy is promising in tumor therapy.
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