肌醇酶-1(IRE1)在果蝇寿命中的功能和机制
文献类型:学位论文
作者 | 李峰 |
学位类别 | 硕士 |
答辩日期 | 2013-03 |
授予单位 | 中国科学院上海生命科学研究院营养科学研究所 |
授予地点 | 中国科学院上海生命科学研究院 |
导师 | 刘勇 |
关键词 | dIRE1 果蝇 百草枯实验 寿命 Sirt1 |
其他题名 | The role of IRE1 in the longevity of Drosophila melanogaster |
学位专业 | 生物化学与分子生物学 |
中文摘要 | 内质网中发生蛋白折叠应激时,统称为未折叠蛋白反应,包括了数条信号传导通路会被激活和整合,其中IRE1?通路是最为保守和重要的一个分支。IRE1?的激活需要其自身反式磷酸化来起始信号的传导。在胰岛?细胞中,IRE1?磷酸化的激活在功能上和胰岛素的生物合成紧密相连。然而关于IRE1?信号通路的调控机制却知之甚少。遗传学研究表明脊椎动物和非脊椎动物在基本细胞生物学通路上具有显著的保守性,而果蝇是研究复杂生物过程中遗传和细胞生物学通路的一个重要模型。用分子遗传学方法构建的Gal4/UAS系统可以将任何基因在果蝇的特定组织和细胞内进行表达,还可以在不同的发育阶段表达致病基因,从而对疾病的病变过程进行研究。我们的研究发现,在模式生物果蝇中,采用RNA干扰使果蝇dIRE1在不同的组织中表达量下降,但表型却不尽相同。在寿命测试中,全身RNAi的果蝇寿命明显缩短;而在神经组织中特异性RNAi的果蝇寿命没有明显变化;脂肪组织中特异性RNAi的果蝇的寿命也呈现出缩短。暗示果蝇IRE1影响果蝇的寿命,而且有组织特异性,主要作用的靶器官是果蝇的脂肪体。在百草枯(paraquet)氧化应激实验中,全身RNAi果蝇在百草枯的作用下寿命明显缩短;而神经组织中特异性RNAi的果蝇寿命没有明显变化,但在脂肪组织中特异性RNAi的果蝇寿命也呈现出明显的缩短;同时发现,果蝇的长寿基因methuselahs在全身和脂肪体RNAi果蝇中都没有显著性变化,但是果蝇的另一个长寿基因Sirt1却比对照果蝇显著地降低。这些结果表明,果蝇dIRE1可能通过调控氧化应激和Sirt1相关信号通路来调控果蝇的寿命。 |
索取号 | M2013-020 |
英文摘要 | Responding to protein-folding stress in the endoplasmic reticulum (ER stress), several signaling pathways will be activated and integrated, and are collectively termed unfolded protein response (UPR), in which the IRE1? pathway is the most conserved and important branch. Activation of IRE1? requires autophosphorylation to initiate the signal transduction. Phosphorylation activation of IRE1? is also functionally connected with insulin biosynthesis in pancreatic ?-cells. Genetic research shows that vertebrate and invertebrate have the same conservative property at the basic cell ways, and Drosophila melanogaster is an important model in the research of cell and genetic singal passways.The Gal4/UAS system can express any genes in any fruit fly specific cells and tissues,and this system can express many virulence genes at different developmental phases to research many different diseases. We found that there are different results when the dIRE1 were knockdown in different tissues. In the longevity test, the whole body RNAi flies had shorter life span than the controls. Although fat body RNAi flies also showed shorter life span compare to the controls, neuron RNAi flies had no change in lifespan compare with the control flies. Upon 30mM paraquet test, we had the similar results to longevity. Moreover, we found the longevity related genes Methuselah showed no significant changes in both whole body and fat body RNAi flies. However, Sit1, a well known longevity related gene, were decreased in both whole body and fat body RNAi flies. Taken together, the results have suggested that dIRE1 plays an important role in longevity thought the oxidative stress or/and Sirt1 singaling passway. |
语种 | 中文 |
公开日期 | 2015-12-24 |
源URL | [http://202.127.25.144/handle/331004/324] ![]() |
专题 | 中国科学院上海生命科学研究院营养科学研究所_糖脂代谢与调控研究组 |
推荐引用方式 GB/T 7714 | 李峰. 肌醇酶-1(IRE1)在果蝇寿命中的功能和机制[D]. 中国科学院上海生命科学研究院. 中国科学院上海生命科学研究院营养科学研究所. 2013. |
入库方式: OAI收割
来源:上海营养与健康研究所
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