项目名称: let-7家族对葡萄膜黑色素瘤放射敏感性的影响及其机制研究
项目编号: No.31200632
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 生物物理、生化与生物分子学、生物力学与组织工程
项目作者: 宋欣
作者单位: 上海交通大学
项目金额: 23万元
中文摘要: 葡萄膜黑色素瘤(Uveal Melanoma,UM)是成人最常见的眼内恶性肿瘤。放疗是其主要治疗方式,但部分UM对放射不敏感。研究表明miRNA表达变化在放射引起的细胞应激反应中发挥作用,进而影响细胞放射敏感性。迄今对UM放射敏感相关miRNA仍知之甚少。我们的预实验结果提示,放射处理后UM细胞中let-7家族miRNA表达显著改变,但其对UM放疗敏感性的具体影响和作用机制还有待进一步探讨。为此,我们提出假说:let-7可能通过影响Ras、C-myc等细胞周期调控蛋白表达,导致UM细胞放射敏感性的改变。为了验证这一假说,我们将通过人UM的 OM431、OCM1等细胞系,采用Real-time PCR,Western blot,慢病毒载体转染等手段,从分子、细胞、动物整体水平等多方面探讨let-7在UM放射敏感性中的作用,明确其调控机制,从而为提高UM放射疗效提供新思路。
中文关键词: 葡萄膜黑色素瘤;放射治疗;Let-7;miRNA;细胞周期
英文摘要: Uveal melanoma (UM) is the most common primary intraocular malignant tumor in adults. Radiotherapy is the preferred treatment for most cases of UM. However,some UM cells are relatively radioresistant.Although microRNA (miRNA) have recently been recognized as important regulators of gene expression and play an important role in response to cellular stress including radiation, it is not well examed if miRNA play any roles in UM cells response to radiation.Therefore,we investigated whether any changes in the expression profiles of miRNA in UM cells.Our current result suggested expression of miRNA in let-7 family significently changed after radiation.We raise the hypothesis:let-7 might play an important role in UM cells response to radiation through regulated the key protein of cell cycle,such as Ras、C-myc.In this project we will try to discover the mechanism of let-7 affected the radiosensitivity of UM cells by in vivo and in vitro study.We believe this project will bring new bright on the radiotherapy for UM.
英文关键词: Uveal melanoma;Radiation therapy;Let-7;miRNA;Cell cycle