Cellular Respiration Bioenergetics

细胞呼吸生物能学

• 批准号: 6660105
• 负责人: CHARLES B CAIRNS
• 金额: $ 15.83万
• 依托单位: UNIVERSITY OF COLORADO DENVER
• 依托单位国家: 美国
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6660105
• 关键词: bioenergetics; cellular respiration; confocal scanning microscopy; cytochrome oxidase; digital imaging; electron transport; enzyme activity; fluorescent dye /probe; gene deletion mutation; human subject; hypoxia; inflammation; infrared spectrometry; ischemia; laboratory rat; membrane potentials; mitochondrial disease /disorder; mitochondrial membrane; multiple organ failure; nuclear factor kappa beta; oxidative stress; oxygen consumption; statistics /biometry; tissue /cell culture; trauma; western blottings

We postulate that mitochondrial oxidative metabolism determines restoration of high energy stores and organ function after traumatic stress sites. Mitochondrial dysfunction leads to impaired energy production, stimulates oxidant induced inflammation and promotes apoptosis. Inflammatory agents important in post-traumatic stress includes mediators such as lysophospholipids (LPC) (with projects IV-Moore and project V-Meng) and tumor necrosis alpha (TNF-alpha) (with project VII-Harken). Not only can these mediators induce mitochondrial dysfunction, but we propose that dysregulated mitochondrial themselves initiate the inflammatory cascade. Multi-system organ dysfunction (MOD) is associated with impaired oxygen consumption (with project IA-Offner). We have reported that severely injured patients who develop MOD exhibit an early decoupling of the redox state of mitochondrial cytochrome a, a3 (cytochrome c oxidase) from tissue oxyhemoglobin. This decoupling of mitochondrial respiration is associated with the production of cellular oxidants and provides evidence of an inherent defect in mitochondrial electron transport after severe traumatic injury. Our preliminary studies suggest that mitochondrial electron transport can be therapeutically manipulated in post-traumatic stress states, resulting in reduced oxidant production, inflammatory mediator generation and improving organ function. Yet, the capacity for mitochondria to respond to therapeutic maneuvers may be influenced by inherent alterations in mitochondrial structure and distribution (with project VIII-Banerjee). Further, the mitochondrial genome is a target of oxidative damage which may lead to the development of irreversible injury and the perpetuation of dysfunction (with project IB-Johnson). Global Hypothesis: Post-traumatic stressors (ischemia, hypoxia, inflammation) decouple cytochrome c oxidase from tissue oxyhemoglobin, alter mitochondrial morphology, distribution, electron transport and membrane potential. Therapies designed to stabilize cytochrome c oxidase and to prevent mitochondrial morphologic alterations will modulate oxidant signaling, hyperinflammation and optimize in vivo mitochondrial respiration during post-traumatic stress.

我们假设线粒体氧化代谢决定创伤应激后高能量储存和器官功能的恢复。线粒体功能障碍导致能量产生受损，刺激氧化剂诱导的炎症并促进细胞凋亡。创伤后应激中重要的炎症因子包括溶血磷脂（LPC）（IV-Moore项目和V-Meng项目）和肿瘤坏死α（TNF-alpha）（VII-Harken项目）等介质。这些介质不仅可以诱导线粒体功能障碍，但我们提出，失调的线粒体本身启动炎症级联反应。多系统器官功能障碍（MOD）与耗氧量受损有关（IA-Offner项目）。我们已经报道，严重受伤的患者谁开发MOD表现出早期解耦的线粒体细胞色素a，a3（细胞色素c氧化酶）的氧化还原状态从组织氧合血红蛋白。线粒体呼吸的这种解耦与细胞氧化剂的产生有关，并提供了严重创伤性损伤后线粒体电子传递固有缺陷的证据。我们的初步研究表明，线粒体电子传递可以在创伤后应激状态下进行治疗操作，从而减少氧化剂的产生，炎症介质的产生和改善器官功能。然而，线粒体响应治疗策略的能力可能受到线粒体结构和分布的固有改变的影响（与项目VIII-Banerjee）。此外，线粒体基因组是氧化损伤的靶点，这可能导致不可逆损伤的发展和功能障碍的永久化（与IB-Johnson项目）。全局假设：创伤后应激（缺血、缺氧、炎症）使细胞色素c氧化酶与组织氧合血红蛋白解偶联，改变线粒体形态、分布、电子传递和膜电位。旨在稳定细胞色素c氧化酶并防止线粒体形态改变的疗法将调节氧化剂信号传导、过度炎症并优化创伤后应激期间的体内线粒体呼吸。