Sub-cellular Targeting of Endothelial ROS in Myocardial Ischemia
Sub-cellular Targeting of Endothelial ROS in Myocardial Ischemia
批准号:
9540053
负责人:
Ruhul Abid
金额:
$40.25万
依托单位:
依托单位国家:
美国
项目类别:
财政年份:
2017
资助国家:
美国
项目状态:
已结题
起止时间:
2017-08-10 至 2021-06-30
关键词:
3-nitrotyrosineAnimal ModelAnimalsAntioxidantsBiomimeticsBlood VesselsCardiac MyocytesCardiac Surgery proceduresCardiovascular DiseasesCatalytic DomainCause of DeathCell ProliferationCell physiologyChronicClinical TrialsCoronaryCoronary ArteriosclerosisCoronary VesselsCoronary arteryDataDiabetes MellitusDown-RegulationEndothelial CellsEndotheliumEnterochromaffin CellsEquilibriumExposure toFailureFamily suidaeGlycosylated hemoglobin AHealthHeartHeart AtriumHumanInfarctionMediatingMembrane PotentialsMetabolic syndromeMitochondriaMolecularMorbidity - disease rateMusMyocardial InfarctionMyocardial IschemiaNADPH OxidaseOutcome StudyOxidantsPatientsPhenotypeProductionProteinsReactive Oxygen SpeciesRecoveryReportingSOD2 geneSignal TransductionTherapeuticTimeTissuesTransgenic OrganismsVascular Endothelial CellVascular blood supplyVasodilationangiogenesisbaseblood vessel developmentcardiovascular disorder preventiondensitydiabeticendothelial dysfunctionfatty acid oxidationheart functionhuman tissueimprovedin vivo evaluationmicrovascular pathologymitochondrial membranemouse modelnanoparticlenovelnovel strategiesnucleotide metabolismoverexpressionsubcellular targeting
中文摘要
心血管疾病(CVD)是美国东部最主要的死亡原因之一。它增加了体内活性氧的水平。
物种死亡(ROS)通常与心血管疾病的微血管和病理改变有关,从而导致血管内皮功能障碍。
而冠状动脉疾病是导致心肌缺血和心肌梗死(MI)的主要原因。然而,失败的原因很多。
在患有心血管疾病的患者中使用抗氧化剂的临床试验,挑战了目前流行的观点,即抗氧化剂的产生是错误的。
--
--
破坏血管微血管。在这项新的提案中提出的最重要的假设是:ECO和NOX--
从ROS中衍生出来的ROS对心肌缺血后立即进行血管重建是非常有益的,但这一点变得越来越重要。
由于线粒体ROS的增加,对肝移植的影响是有害的。但由于对肝细胞的干预,更多的治疗效果是有益的。
ROS水平的实现最好的方式是通过降低欧洲经济共同体中尚未暴露于LLT的Mmito-Ros的具体监管标准来实现。
增加NOX-ROS的含量,例如在糖尿病中。这一假说将在体内进行全面的测试,使用我们最新的特定于EC的基因。
转基因锰超氧化物歧化酶(MnSOD--OE)在动物中得到支持,并支持使用线粒体特异的亚硝酸根。
从心血管疾病患者和接受心脏手术的糖尿病患者的冠状动脉中提取的抗氧化剂纳米颗粒。
具体目标1:阐明ST和LT之间的分子调控机制,以增加欧盟特有的NOX-Ros。
(NOx--OE小鼠模型)可在血管内皮细胞功能和血管生成方面发挥不同的作用,促进血管内皮细胞的正常恢复。
梗死后的心肌缺血。我们假设这是可能的,而ST段的NOX-ROS会增加和诱导。
AMPK®eNOS和AMPK®CPT1介导的线粒体、脂肪酸和氧化还原酶以及DNA的增加。
合成,LLT将增加NOX--ROS的含量,从而导致N硝基-酪氨酸诱导的TMnSOD失活,从而增加细胞分裂--
ROS,将减少有丝分裂膜的潜在活性,并减少DNTP的合成,从而减少内皮细胞的增殖。
具体目标2:确定欧共体特有的MnSOD基因过度表达是否可以保护人们免受这种疾病的有害影响
它表明,在脑梗塞后和缺血后的心肌中,NOX-ROS对血管密度和心脏功能的影响。
假设超氧化物歧化酶-OE通过降低心肌梗死后心肌梗死后血清总抗氧化能力,从而改善心功能的恢复。
改善NOX-OE动物体内的NTP合成/EC增殖能力,并提高糖尿病动物体内的DNA合成/EC增殖能力。
NOX-OE:SOD-OE与NOX-OE,我们将不会检查患有糖尿病的患者是否有心肌梗死后的恢复。
具体目标3:阐明以线粒体为靶点的氮氧化物、抗氧化剂和超氧化物歧化酶的生物效应。
纳米颗粒对小鼠脑梗塞后血管密度和心功能恢复有影响,对慢性心肌梗死有影响。
患有代谢性心脏病综合征的大型动物(猪)出现心肌缺血。
具体目标4:确定以线粒体为靶点的亚硝基、抗氧化剂和超氧化物歧化酶的生物效应。
纳米颗粒作用于人类冠脉血管的新生血管和潜在的血管生成能力,这些血管来自患有糖尿病或非糖尿病的患者。
血管来自糖尿病患者(非糖尿病患者)、非糖尿病患者(HbA1c>;8.5)、非糖尿病患者(HbA1c<;7)和非糖尿病患者(对照组)的心房血管。
HbA1c<;5.5)正在接受心脏手术的患者将不会接受检查。
英文摘要
Cardiovascular disease (CVD) is the leading cause of death in the USA. Increased levels of reactive oxygen
species (ROS) are often associated with microvascular pathology in CVD, causing endothelial dysfunction
and coronary artery disease and leading to myocardial ischemia and infarction (MI). However, failure of large
clinical trials using antioxidants in patients with CVD, challenges the prevailing view that ROS production is
damaging to the microvasculature. The overarching hypothesis put forth in this proposal is that EC NOX-
derived ROS is beneficial for revascularization immediately following myocardial ischemia but becomes
detrimental upon over the LT due to increase in mitochondrial ROS. The therapeutic benefit of intervening on
ROS level is best realized by specific down regulation of mito-ROS in ECs that have been exposed to LT
increase in NOX-ROS such as in DM. This hypothesis will be fully tested in vivo using our novel EC-specific
transgenic MnSOD (MnSOD-OE) animals and supported using mitochondria-specific nitroxide and
nanoparticle antioxidant in coronary vessels from CVD patients with DM undergoing cardiac surgery.
Specific Aim 1: Elucidate the molecular mechanisms by which ST vs LT increase in EC-specific NOX-ROS
(NOX-OE mouse model) exert differential effects on EC function and angiogenesis and the recovery of the
post-infarct ischemic myocardium. We hypothesize that whereas ST NOX-ROS increase induces
AMPK®eNOS and AMPK®CPT1-mediated increase in mitochondrial fatty acid oxidation and dNTP
synthesis, LT increase in NOX-ROS results in nitro-tyrosine-induced inactivation of MnSOD, increase in mito-
ROS, decrease in mito-membrane potential and dNTP synthesis leading to reduced EC proliferation.
Specific Aim 2: Determine if EC-specific MnSOD overexpression protects against the detrimental effects of
LT exposure of NOX-ROS on vessel density and cardiac functions in post-infarct ischemic myocardium. We
hypothesize that SOD-OE will improve post-MI recovery of the cardiac function by reducing mito-ROS and
improving dNTP synthesis/EC proliferation in LT NOX-OE animals and in animals with DM. Double transgenic
NOX-OE:SOD-OE vs NOX-OE, and SOD-OE with DM will be examined for post-MI recovery.
Specific Aim 3: Elucidate the effects of mitochondrial-targeted nitroxide antioxidant and SOD biomimetic
nanoparticles on post-infarct vessel density and recovery of cardiac function in mice and on chronic
myocardial ischemia in large animals (swine) with metabolic syndrome.
Specific Aim 4: Determine the effects of mitochondrial-targeted nitroxide antioxidant and SOD biomimetic
nanoparticles on angiogenic potential of human coronary vessels from patients with or without DM. Coronary
vessels from atrial tissues of patients (uncontrolled DM HbA1c>8.5, controlled DM HbA1c<7, and non-DM
HbA1c<5.5) undergoing cardiac surgery will be examined.
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会议论文
Sub-cellular Targeting of Endothelial ROS in Myocardial Ischemia
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