MITOCHONDRIAL EFFECTS ON SENSITIVITY TO ANESTHETICS

线粒体对麻醉药敏感性的影响

• 批准号: 2743805
• 负责人: Margaret Mary Sedensky
• 金额: $ 26.76万
• 依托单位: CASE WESTERN RESERVE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2743805
• 关键词: Caenorhabditis elegans; NAD(P)H dehydrogenase; adenosine triphosphate; alternatives to animals in research; anesthetics; cell membrane; drug hypersensitivity; drug screening /evaluation; electron transport; enzyme structure; gene expression; gene mutation; inhalation anesthesia; isoflurane; mitochondria; mutant; nerve /myelin protein; peroxidation; pharmacokinetics; phosphorylation; stereoisomer

The long term goal of this laboratory is to understand at the molecular level how the volatile anesthetics work. Such knowledge is certainly vital for future rational design of these compounds; it may also prove useful as a probe in understanding the basis of consciousness itself. We have used the nematode C. elegans to identify genes that control the behavior of this animal in volatile anesthetics. A mutation in one of these genes, gas-1,is hypersensitive to all volatile anesthetics tested, and overrides the effects of any other mutation on the animal's behavior in anesthetic gases. gas-1 codes for one subunit of the first protein complex (complex l) of the mitochondrial electron transport chain. We propose to analyze at the molecular level how this protein, the 49kDA subunit of NADH ubiquinone oxidoreductase, affects anesthetic sensitivity in C. elegans. The specific aims of this proposal are to: 1. identity the expression of this gene both temporally and spatially. Powerful techniques unique to C. elegans make it possible to know the individual cells in which this gene operates well as to pinpoint developmental stages crucial to the gene's function. 2. measure the effects of gas-1 on oxidative phosphorylation and membrane peroxidation. Both of these processes are dependent on complex l; either or both may be responsible for the gene's control of behavior in volatile anesthetics. 3.find additional mutations in gas-1 and other mitochondrial proteins. We must find more alleles of gas-1 to correlate structure of its protein product to its function. In addition, by screening for suppressors or enhancers of gas-1, we may find other genes that code for mitochondrial proteins that affect anesthetic response. Newly Identified genes will also be studied for their effect on oxidative phosphorylation and membrane peroxidation. We may ultimately identify a functional cluster of proteins that is responsible for the effect of volatile anesthetics in C. elegans. gas-1 profoundly affects anesthetic sensitivity in C. elegans; it is the gene that appears closest to a true anesthetic target in this model. This is consistent with earlier studies which identified complex l as the most sensitive protein complex of the electron transport chain to volatile anesthetics. A precise understanding of gas-1 's molecular interactions with volatile anesthetics will provide invaluable information as to how volatile anesthetics work at the molecular level.

这个实验室的长期目标是在分子水平上了解挥发性麻醉剂是如何起作用的。这些知识对于未来合理设计这些化合物当然是至关重要的；它也可能被证明是理解意识本身基础的一个有用的探针。我们已经使用线虫C. elegans来识别控制这种动物在挥发性麻醉剂中的行为的基因。其中一种基因gas-1的突变对所有测试的挥发性麻醉药都非常敏感，并且会超过任何其他突变对麻醉气体中动物行为的影响。Gas-1编码线粒体电子传递链的第一个蛋白质复合体（复合体l）的一个亚基。我们建议在分子水平上分析这种蛋白质（NADH泛醌氧化还原酶的49kDA亚基）如何影响秀丽隐杆线虫的麻醉敏感性。本建议的具体目的是：1。鉴定该基因在时间和空间上的表达。秀丽隐杆线虫特有的强大技术使我们有可能了解这种基因运作良好的单个细胞，从而精确定位对该基因功能至关重要的发育阶段。2. 测定气-1对氧化磷酸化和膜过氧化的影响。这两个过程都依赖于复数l；其中一种或两者都可能是基因控制挥发性麻醉剂行为的原因。3.发现gas-1和其他线粒体蛋白的额外突变。我们必须找到更多的gas-1等位基因，以便将其蛋白质产物的结构与其功能联系起来。此外，通过筛选gas-1的抑制因子或增强因子，我们可能会发现影响麻醉反应的线粒体蛋白编码的其他基因。新发现的基因也将研究其对氧化磷酸化和膜过氧化的影响。我们可能最终确定一个功能性的蛋白质簇，负责对秀丽隐杆线虫的挥发性麻醉药的影响。gas-1深刻影响秀丽隐杆线虫的麻醉敏感性；在这个模型中，这种基因似乎最接近真正的麻醉目标。这与早期的研究一致，即复合体l是电子传递链中对挥发性麻醉剂最敏感的蛋白质复合体。对气体-1分子与挥发性麻醉药相互作用的精确理解将为挥发性麻醉药如何在分子水平上起作用提供宝贵的信息。