OXIDATIVE STRESS AND AGING--INTEGRATED MECHANISMS

氧化应激与衰老——综合机制

• 批准号: 6055390
• 负责人: KEVIN C KREGEL
• 金额: $ 22.91万
• 依托单位: UNIVERSITY OF IOWA
• 依托单位国家: 美国
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-30 至 2001-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6055390
• 关键词: aging; allopurinol; animal old age; antioxidants; catalase; electron spin resonance spectroscopy; environmental stressor; free radical oxygen; heat; immature animal; injury /disease stressor; laboratory rat; mature animal; oxidative stress; physiologic stressor; stress; superoxide dismutase; transfection

DESCRIPTION (Adapted from the Applicant's Abstract): Aging is associated with a general loss of ability to modulate responses to a physiological stress. The mechanisms underlying the loss of the capacity of the aging organism to cope with stress are unclear, but evidence implicates increased generation of reactive oxygen species (ROS) and associated oxidative stress. Using electron paramagnetic resonance spectroscopy the investigators have demonstrated that in both young and old rats heat stress quantitatively increases nitric oxide and ROS generation, leading to oxidative tissue injury. They have also demonstrated that older rats are significantly less thermotolerant to repeated heat challenge than young rats and are less capable of generating protective stress proteins. Pilot studies establish that following heat stress, both ROS production and mortality rates are exaggerated in senescent versus young rats. Thus, the guiding hypothesis for this research program is that aging organisms have a reduced ability to cope with physiological stress due to an exaggerated production of ROS and concomitant oxidative damage. They will examine this hypothesis by: 1) determining if ROS production and oxidative injury are exaggerated, and as a consequence, morbidity and mortality rates are increased following heat stress in senescent versus mature and young conscious rats; 2) elevating antioxidant capacity in older rats to reduce the level of oxidative stress with the goal of achieving lower morbidity and mortality rates; and 3) determining if the loss of transcriptional regulation of important stress-induced genes occurs in aged rats. They will use an integrated approach that includes whole animal, cellular, molecular, and novel in vivo gene transfer techniques that overexpress antioxidant enzymes to pursue basic mechanisms in the stress response. By using a variety of state-of-the-art techniques, the intent is to be able to address important mechanistic questions involving free radical formation, oxidant stress, and aging that will have application to numerus clinical problems (heat stoke, septic shock, cardiovascular disease, diabetes, frailty, etc.) in the aged population.

描述（改编自申请人摘要）：老化与 一般丧失了调节对生理反应的能力 应力 衰老能力丧失的机制 机体科普压力的能力尚不清楚，但有证据表明， 产生活性氧（ROS）和相关的氧化应激。 利用电子顺磁共振光谱，研究人员 表明，在年轻和老年大鼠热应激定量 增加一氧化氮和活性氧的产生，导致氧化组织 损伤 他们还证明，年龄较大的老鼠 热耐受重复热挑战比年轻的大鼠， 能够产生保护性应激蛋白。 试点研究建立了 在热应激后，ROS的产生和死亡率都是 在衰老的老鼠和年轻的老鼠中被夸大了。 因此，指导假设 对于这个研究项目来说，衰老的生物体具有降低的能力， 科普由于ROS过度产生而产生的生理压力， 伴随的氧化损伤。 他们将通过以下方式检验这一假设：1） 确定ROS的产生和氧化损伤是否被夸大，并作为一种 因此，发病率和死亡率增加后，热 衰老与成熟和年轻清醒大鼠的应激; 2）升高 老年大鼠的抗氧化能力，以降低氧化应激水平 目标是降低发病率和死亡率;以及3） 确定是否失去重要的转录调控， 应激诱导基因出现在老年大鼠中。 他们将使用一种综合方法，包括整个动物，细胞， 分子和新的体内基因转移技术， 抗氧化酶在应激反应中的基本机制。 通过 使用各种最先进的技术，目的是能够 解决了涉及自由基形成的重要机制问题， 氧化应激和衰老，这将对许多临床 问题（热斯托克，败血性休克，心血管疾病，糖尿病， 脆弱等）在老年人口中。