miR-615, AKT/eNOS signaling, and angiogenesis

miR-615、AKT/eNOS 信号传导和血管生成

基本信息

批准号：
10159956
负责人：
MARK W FEINBERG
金额：
$ 67.83万
依托单位：
BRIGHAM AND WOMEN'S HOSPITAL
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-05-15 至 2024-04-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10159956
关键词：
3&apos Untranslated Regions AKT inhibition Acute Base Pairing Binding Biological Assay Biology Blood Vessels Blood capillaries Blood flow Brain Cardiovascular Diseases Cardiovascular Physiology Cardiovascular system Cell Proliferation Cell physiology Cellular biology Chronic Clinical Research Deletion Mutation Disease Endothelial Cells Endothelium FGF2 gene Foundations Gene Expression Genes Genetic Transcription Goals Growth Growth Factor Health Expenditures Heart Hindlimb Human IGF2 gene Impairment Infarction Injections Ischemia Knockout Mice Leg Ligation Limb structure Link Mediating Mediator of activation protein Messenger RNA MicroRNAs Molecular Morbidity - disease rate Mus Myocardial Myocardial Infarction Myocardial Ischemia Nitric Oxide Organoids Outcome Participant Pathway interactions Patients Peripheral arterial disease Phenocopy Plasma Process Proliferating Proto-Oncogene Proteins c-akt Publishing Recovery Regulation Reperfusion Therapy Reporter Genes Resistance Role Signal Pathway Signal Transduction Stimulus Therapeutic Thrombospondin 1 Tissue Sample Tissues Tube United States Untranslated RNA Untranslated Regions Vascular Endothelial Cell Vascular Endothelial Growth Factors acute coronary syndrome angiogenesis artery occlusion blood vessel development cell growth cell motility crosslinking and immunoprecipitation sequencing human disease human subject human tissue improved in vivo inhibitor/antagonist insight intravenous administration ischemic injury loss of function matrigel miRNA expression profiling migration molecular imaging mortality myocardial infarct sizing nanoparticle neovascularization novel novel therapeutic intervention novel therapeutics overexpression perfusion imaging preclinical study response response to injury tissue repair transcriptome sequencing transcriptomics wound closure

项目摘要

Ischemic cardiovascular disease (CVD) due to atherosclerotic occlusion of the arteries to the heart, legs, or brain is associated with considerable morbidity, mortality, and health care expenditure in the United States. The induction and orchestration of new blood vessels is critical for tissue repair in response to injury such as myocardial infarction or peripheral artery disease (PAD). In response to pro-angiogenic stimuli, vascular endothelial cells (ECs) are activated to migrate and proliferate to form primary capillaries. However, despite the importance of ECs in neoangiogenesis, our understanding of the mechanisms regulating this process remains poorly understood. Emerging studies indicate that the inability of angiogenic growth factors to stimulate angiogenesis is likely due to impaired angiogenic signaling and not due to deficiency in these growth factors. MicroRNAs (miRNAs) are small, single-stranded, non-coding RNAs capable of repressing gene expression by base pairing to the 3' untranslated regions (3'-UTRs) of mRNA targets and are involved in a variety of pathophysiological processes in cardiovascular biology, though their function in angiogenesis and angiogenic signaling pathways remains poorly defined. We undertook a microarray profiling approach of plasma from subjects with ischemic CVD and identified that miR-615-5p expression is increased by ischemia and reduced in response to pro-angiogenic stimuli–observations that are recapitulated in both mice and human ischemic paradigms in vivo. Preliminary and published gain and loss-of-function studies reveal that miR-615-5p overexpression markedly impaired EC proliferation, migration, and network tube formation in matrigel, whereas blockade of miR-615-5p had the opposite effects. Mechanistically, using unbiased transcriptomic profiling, we find that miR-615-5p suppressed EC proliferation and binding to 2 unique targets–RASSF2 and IGF2–in their 3'-UTRs and reduced their expression, an effect that selectively regulated the AKT/eNOS signaling pathway in ECs. Finally, systemic intravenous administration of miR-615-5p inhibitors increased blood vessel formation and reduced infarct size and improved blood flow recovery in ischemic legs compared to mice that received scrambled control anti-miR injections. These observations provide the foundation for the central hypothesis that miR-615-5p may serve as a critical regulator of EC proliferation and angiogenic responses. To better understand the precise role of miR-615-5p in AKT/eNOS signaling and angiogenesis, we will in Aim1 delineate the upstream mechanisms governing miR-615-5p expression in ECs. In Aim2, we will determine the molecular basis for miR-615-5p's ability to regulate AKT/eNOS signaling and EC functions critical to angiogenesis. In Aim3, we will explore the effect of altering miR-615-5p expression in the microvasculature on acute and chronic experimental ischemic injury. The results of these studies will provide insights regarding miR-615-5p function in EC biology, pathophysiological angiogenesis, and cardiovascular ischemic states and may provide new targets to rescue impaired angiogenic signaling for a range of ischemic cardiovascular disease states.

由于心脏、腿部或身体的动脉粥样硬化闭塞而导致的缺血性心血管疾病 (CVD) 在美国，大脑与相当大的发病率、死亡率和医疗保健支出相关。新血管的诱导和协调对于响应损伤的组织修复至关重要，例如心肌梗塞或外周动脉疾病（PAD）响应促血管生成刺激，血管。内皮细胞（EC）被激活迁移和增殖形成初级毛细血管。 ECs 在新血管生成中的重要性，我们对调节这一过程的机制的理解仍然存在新兴研究表明血管生成生长因子无法刺激。血管生成可能是由于血管生成信号受损，而不是由于这些生长因子的缺乏。 MicroRNA (miRNA) 是小型单链非编码 RNA，能够抑制基因通过与 mRNA 靶标的 3' 非翻译区 (3'-UTR) 碱基配对来表达，并参与心血管生物学中的各种病理生理过程，尽管它们在血管生成和血管生成信号通路仍不清楚。我们采用了微阵列分析方法。来自缺血性 CVD 受试者的血浆，并发现 miR-615-5p 表达因缺血而增加并因对促血管生成刺激的反应而减少——在小鼠和人类中都有重现的观察结果初步和已发表的功能获得和丧失研究表明 miR-615-5p 过度表达显着损害基质胶中的 EC 增殖、迁移和网管形成，而从机制上讲，我们使用无偏转录组分析来阻断 miR-615-5p。发现 miR-615-5p 抑制 EC 增殖并与 2 个独特靶标（RASSF2 和 IGF2）结合 3'-UTR 并减少其表达，这是一种选择性调节 AKT/eNOS 信号通路的效应最后，全身静脉注射 miR-615-5p 抑制剂可增加血管形成。与接受治疗的小鼠相比，缺血腿部的梗塞面积减少，血流恢复得到改善这些观察结果为中心假设奠定了基础。 miR-615-5p 可能作为 EC 增殖和血管生成反应的关键调节因子。为了了解 miR-615-5p 在 AKT/eNOS 信号传导和血管生成中的精确作用，我们将在 Aim1 中描述在 Aim2 中，我们将确定控制 EC 中 miR-615-5p 表达的上游机制。 miR-615-5p 调节对血管生成至关重要的 AKT/eNOS 信号传导和 EC 功能的能力的基础。 Aim3，我们将探讨改变微血管系统中 miR-615-5p 表达对急性和慢性疾病的影响。这些研究的结果将提供有关 miR-615-5p 的见解。在 EC 生物学、病理生理学血管生成和心血管缺血状态中发挥作用，并可能提供挽救一系列缺血性心血管疾病状态下受损的血管生成信号的新目标。