Antioxidant transgene in diabetic cardiomyopathy

糖尿病心肌病中的抗氧化转基因

• 批准号: 6770080
• 负责人: PAUL N EPSTEIN
• 金额: $ 29.4万
• 依托单位: UNIVERSITY OF LOUISVILLE
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6770080
• 关键词: NAD(P)H dehydrogenase; antioxidants; catalase; confocal scanning microscopy; diabetes mellitus; diabetic cardiomyopathy; disease /disorder model; electrospray ionization mass spectrometry; free radical oxygen; free radical scavengers; gene expression; genetically modified animals; heart contraction; laboratory mouse; matrix assisted laser desorption ionization; metallothionein; myocardial infarction; western blottings

DESCRIPTION (provided by applicant): Many diabetics suffer from severe cardiomyopathy even in the absence of vascular disease. Evidence from animal models and clinical samples implicate reactive oxygen species (ROS) in the development of diabetic cardiomyopathy. Our results confirm the importance of ROS. In the OVE26 model of Type I diabetes we find increased cardiac oxidative damage, increased production of ROS by diabetic cardiomyocytes and protection by antioxidant transgenes. Two different antioxidant proteins targeted to the cardiomyocyte, metallothionein (MT) and catalase prevented most of the primary characteristics of diabetic cardiomyopathy, including reduced contractility, impaired calcium homeostasis and disrupted morphology. Our most recent data implicate mitochondrial electron transport and the enzyme NADPH oxidase in the production of oxidative damage in diabetic cardiomyocytes. This project will identify the cellular source of increased ROS production in diabetic hearts, determine which proteins are the targets of ROS modification and test whether the importance of ROS in Type I diabetes also applies to cardiomyopathy in Type II diabetes. Sources of ROS will be tested by measuring ROS production in diabetic cardiomyocytes as a function of genetic knockout or drug inhibition of potential sources. Breeding diabetic mice to knockout mice for NADPH oxidase will determine if this enzyme is required for the development of diabetic cardiomyopathy. Protein targets of ROS modification in whole heart, mitochondria and sarcoplasmic reticulum will be identified by using proteomic analysis combined with antibodies against oxidatively modified amino acids. To analyze the role of ROS in Type II diabetic cardiomyopathy we will characterize cardiac morphology, ROS production, cardiac function and oxidative damage in the agouti model of Type II diabetes. Agouti mice will be bred to mice protected by cardiac specific antioxidant transgenes to determine if oxidative damage is a requirement for cardiomyopathy in this model.

描述（由申请人提供）：许多糖尿病患者即使没有血管疾病也患有严重的心肌病。来自动物模型和临床样本的证据表明活性氧（ROS）与糖尿病心肌病的发展有关。我们的结果证实了 ROS 的重要性。在 I 型糖尿病的 OVE26 模型中，我们发现心脏氧化损伤增加、糖尿病心肌细胞产生的 ROS 增加以及抗氧化剂转基因的保护。针对心肌细胞的两种不同的抗氧化蛋白，金属硫蛋白（MT）和过氧化氢酶可以预防糖尿病心肌病的大部分主要特征，包括收缩力降低、钙稳态受损和形态破坏。我们最新的数据表明线粒体电子传递和 NADPH 氧化酶在糖尿病心肌细胞氧化损伤的产生中发挥作用。该项目将确定糖尿病心脏中 ROS 产生增加的细胞来源，确定哪些蛋白质是 ROS 修饰的目标，并测试 ROS 在 I 型糖尿病中的重要性是否也适用于 II 型糖尿病的心肌病。 ROS 的来源将通过测量糖尿病心肌细胞中 ROS 的产生作为基因敲除或潜在来源的药物抑制的函数来测试。将糖尿病小鼠培育成 NADPH 氧化酶基因敲除小鼠，将确定这种酶是否是糖尿病心肌病发展所必需的。通过蛋白质组分析结合抗氧化修饰氨基酸的抗体，将鉴定整个心脏、线粒体和肌浆网中 ROS 修饰的蛋白质靶点。为了分析 ROS 在 II 型糖尿病心肌病中的作用，我们将表征 II 型糖尿病刺鼠模型中的心脏形态、ROS 产生、心脏功能和氧化损伤。 Agouti 小鼠将与受心脏特异性抗氧化剂转基因保护的小鼠交配，以确定氧化损伤是否是该模型中心肌病的必要条件。