OXIDATIVE STRESS IN PARKINSON'S DISEASE

帕金森病中的氧化应激

• 批准号: 6594121
• 负责人: JAMES PEPPER BENNETT
• 金额: $ 4.44万
• 依托单位: UNIVERSITY OF VIRGINIA
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-04-13 至 2005-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6594121
• 关键词: BCL2 gene /protein; Parkinson's disease; apoptosis; brain; calcium flux; cell free system; cellular pathology; cytochrome c; electron transport; enzyme activity; human tissue; hybrid cells; membrane potentials; mitochondria; mitogen activated protein kinase; molecular pathology; mutant; nuclear factor kappa beta; oligonucleotides; oxidative stress; polymerase chain reaction; postmortem; protein protein interaction; transcription factor; transfection /expression vector

Idiopathic Parkinson's Disease (PD) is a major neurodegenerative disease affecting at least 1 million Americans, and the cellular cause of PD is not yet known with certainty. This proposal will explore further the central hypothesis that defects in mitochondrial electron transport chain (ETC) function are a major contributor to premature cell death in PD and will address four Specific Aims 1) define the pathophysiology of mitochondrial transition pore function, and how regulation of membrane potential and intracellular calcium signaling are altered in PD; 2) determine mechanisms of Bcl protein regulation in PD cybrids, and whether transfection with Bcl-overexpression vectors alters mitochondrial function and improves survival; 3) further define the interactions among MAPKinase signaling pathways and NFkappaBeta transcription factor in PD; and 4) characterize mitochondrial transition pore complexes isolated from human postmortem PD brain and compare their function to those isolated from control brain. This project will make use of state-of-the- art intracellular ion imaging technology, RT-PCR techniques, gene transfection strategies, and will develop cell-free systems to examine several inter-related hypotheses. Behind all of these laboratory experiments is a therapeutic imperative, which will be explored in cell and cell-free models. Because new data presented in this application supports the hypothesis of systemically increased oxidative stress in PD patients, exploring these events in an established cell model is even more compelling. This proposal will also compare findings in PD cybrids with those in SY5Y cells exposed to chronic rotenone treatment, a pharmacological cell-based model of complex I loss. Ultimately, the results from this proposal will establish the central importance of genetically acquired mitochondrial ETC dysfunction as an etiologic factor in sporadic PD. Paradigms for evaluating neuroprotective therapies will also be developed to allow targeted approaches to correcting consequences of increased oxidative stress in cells.

特发性帕金森病 (PD) 是一种主要的神经退行性疾病，影响至少 100 万美国人，且 PD 的细胞原因尚不清楚。 该提案将进一步探讨核心假设，即线粒体电子传递链 (ETC) 功能缺陷是 PD 细胞过早死亡的主要原因，并将解决四个具体目标 1) 定义线粒体过渡孔功能的病理生理学，以及如何调节线粒体电子传递链 (ETC) 功能的缺陷。 PD 中膜电位和细胞内钙信号传导发生改变； 2) 确定PD细胞杂种中Bcl蛋白调节的机制，以及用Bcl过表达载体转染是否会改变线粒体功能并提高存活率； 3) 进一步明确PD中MAPKinase信号通路与NFkappaBeta转录因子之间的相互作用； 4) 表征从人死后 PD 大脑中分离的线粒体过渡孔复合物，并将其功能与从对照大脑中分离的线粒体过渡孔复合物进行比较。 该项目将利用最先进的细胞内离子成像技术、RT-​​PCR 技术、基因转染策略，并将开发无细胞系统来检验几个相互关联的假设。 所有这些实验室实验的背后都是治疗的迫切需要，这将在细胞和无细胞模型中进行探索。 由于本申请中提供的新数据支持 PD 患者氧化应激系统性增加的假设，因此在已建立的细胞模型中探索这些事件更加引人注目。该提案还将比较 PD cybrids 与接受慢性鱼藤酮治疗的 SY5Y 细胞的研究结果，这是一种基于药理学细胞的复合物 I 丢失模型。 最终，该提案的结果将确定遗传性线粒体 ETC 功能障碍作为散发性 PD 病因的核心重要性。 还将开发评估神经保护疗法的范例，以允许有针对性的方法来纠正细胞中氧化应激增加的后果。