The importance of mTOR signaling in cardiac aging and lifespan in mammals

mTOR 信号传导在哺乳动物心脏衰老和寿命中的重要性

• 批准号: 8481494
• 负责人: PETER S RABINOVITCH
• 金额: $ 29.05万
• 依托单位: UNIVERSITY OF WASHINGTON
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8481494
• 关键词: Accounting; Aging; Biogenesis; Cardiac; Data; Elderly; Functional disorder; Genetic; Health; Health Benefit; Heart; Human; Intervention; Knock-out; Knockout Mice; Knowledge; Lead; Link; Longevity; Mammals; Mediating; Metabolism; Mitochondria; Monitor; Mus; Nutrient; Pathway interactions; Physiological; Protein Biosynthesis; Proteins; Reactive Oxygen Species; Research; Research Personnel; Resistance; Signal Pathway; Signal Transduction; Transgenic Mice; Translational Regulation; Translations; Yeasts; arm; cell growth; design; dietary restriction; human morbidity; human mortality; insight; mTOR protein; mortality; novel therapeutic intervention; programs

DESCRIPTION (provided by applicant) Nutrient signaling is central and evolutionarily conserved in pathways that modulate aging and lifespan, as our Program Project investigators have demonstrated in preliminary studies of yeast and worms. The mTOR (mammalian target of rapamycin) signaling pathway monitors Intracellular amino add levels and regulates protein synthesis, cell growth, and ribosomal biogenesis. We hypothesize that reduced signaling through the mTOR pathway has positive effects on aging and lifespan, which are mediated by translational regulation. Furthermore, signaling through mTOR may be intimately linked to mitochondrial metabolism and reactive oxygen species (ROS), thus providing a mechanistic connection between the paradigms of ROS and dietary restriction in aging. Evidence, including our preliminary data, suggests that these effects may be particularly important in cardiac aging, an important cause of human morbidity and mortality. The focus of the research in Project 2 derives from these key findings. We will use knockout, conditional knockout and transgenic mice to delineate the effects of reduced signaling through the TORCl arm of the mTOR pathway and the interactions of this signaling with dietary restriction and reactive oxygen species (ROS). Specific Aim 1 is to establish whether reduced TORCl signaling enhances cardiac resistance to aging. We will determine whether this mechanism can account for the cardiac benefits of dietary restriction, whether it is mediated by alterations in protein translation and whether reduced levels of ROS are a significant part of this mechanism. In Aim 2, we will extend these studies to effects on mouse lifespan to confirm that reduced TORCl signaling Increases mouse longevity. These genetic approaches will lead to fundamental insights into key regulators of longevity and determinants of health span, and that with this knowledge, pharmacologic interventions can be designed to confer similar health benefits to humans. Cardiac aging Is a significant cause of late-life mortality and diastolic dysfunction is a major contributor to the physiological declines in the aging heart. The proposed studies may reveal novel therapeutic interventions for diastolic dysfunction which currently are sorely lacking.

正如我们的项目研究者在酵母和蠕虫的初步研究中所证明的那样，营养信号在调节衰老和寿命的途径中是核心和进化保守的。mTOR（哺乳动物雷帕霉素靶蛋白）信号通路监测细胞内氨基酸添加水平并调节蛋白质合成、细胞生长和核糖体生物发生。我们假设通过mTOR途径减少的信号具有积极的作用