项目名称: ATM介导的底物磷酸化在电离辐射诱导的细胞自噬中的作用
项目编号: No.31500682
项目类型: 青年科学基金项目
立项/批准年度: 2016
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: 贾立立
作者单位: 吉林大学
项目金额: 20万元
中文摘要: 电离辐射可以导致遗传不稳定性和肿瘤发生,其原理是辐射导致DNA的损伤。同时,临床实践应用放射治疗肿瘤,也是利用辐射导致肿瘤细胞发生不可修复的DNA损伤。DNA损伤后,细胞会激活一系列的应对机制,包括细胞周期阻滞,DNA修复以及细胞程序性死亡(PCD)等,细胞自噬(autophagy)是程序性死亡方式之一。ATM蛋白激酶在电离辐射诱导的细胞反应调控中发挥重要作用,我们的前期结果证明ATM在电离辐射诱导的自噬中起作用。本课题将侧重研究ATM磷酸化一系列底物在自噬中的调控作用。通过自建的一系列电离辐射诱导自噬的细胞模型,研究蛋白质组学识别的4个与自噬相关ATM底物(BID,CDKN1B,GABARAPL2,MAPK14)的磷酸化位点,阐明ATM在电离辐射诱导的自噬中的调控机制。本研究通过探讨这些信号传导途径,为阐明自噬在肿瘤发生、发展中的分子机制,以及开发新的肿瘤放疗增敏药物提供理论依据。
中文关键词: ATM;电离辐射;DNA损伤;自噬;磷酸化
英文摘要: Radiation can induce genetic instability and tumorigenesis, the mechanism is radiation can induce DNA damage. Clinical practice use radiotherapy for tumor, also use radiation can induce tumor cells unprothetic DNA damage. After DNA damage, cells activate a series of coping mechanism, including cell cycle block, DNA repair and programmed cell death (PCD) et al, autophagy is one of PCD. ATM is one of protein kinase, it takes an important role in regulation of radiation induced cell reaction. Our prophase results identified that ATM take a role in radiation induced autophagy of cells. Here we lay paricular emphasis on the regulation of ATM phosphorylate a serises of substrate. Our team establish a series of radiation induced cell model, to search for proteomics noetic phosphorylate site of 4 ATM substrate (BID, CDKN1B, GABARAPL2, MAPK14) in autophagy, and to clarify the mechanism of ATM regulated roles in radiation induce autophagy. This research investigate these cell transduction pathway, clarificate molecule mechanism of autophagy in tumorigenesis and development, and can use to expolitate new drugs of tumor radiosensitization.
英文关键词: ATM;radiation;DNA damage;autophagy;phosphorylation