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Dedicator of cytokinesis 2 in abdominal aortic aneurysm

腹主动脉瘤胞质分裂2的奉献者

基本信息

批准号：
10417112
负责人：
Shiyou Chen
金额：
$ 52.32万
依托单位：
UNIVERSITY OF MISSOURI-COLUMBIA
依托单位国家：
美国
项目类别：
财政年份：
2019
资助国家：
美国
起止时间：
2019-07-01 至 2024-06-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10417112
关键词：
Abdominal Aortic Aneurysm Affect Aneurysm Aortic Aneurysm Apolipoprotein E Arterial Medias Arteries Attenuated Basic Science Blood Vessels Bone Marrow Transplantation CCL2 gene Cell physiology Cells Collagen Contractile Proteins Core Facility Cytokinesis Data Development Disease Elastases Elastin Environment Equipment Extracellular Matrix Extracellular Matrix Degradation Extracellular Matrix Proteins Gelatinase A Goals Hematopoietic Histologic Homeostasis Human Immune Infiltration Inflammation Inflammatory Infusion procedures Interleukin-1 beta Intracranial Aneurysm JUN gene Knockout Mice Knowledge Laboratories Lead Light Medial Mediating Modeling Molecular Mus NF-kappa B Outcome Patients Peptide Hydrolases Pharmacological Treatment Pharmacology Phenotype Play Positioning Attribute Prevention strategy Prevention therapy Production Research Resources Role Smooth Muscle Myocytes T-Lymphocyte TNF gene Techniques Testing Tissues Tunica Media United States National Library of Medicine Universities Vascular Smooth Muscle Vascular remodeling animal facility clinical application genetic approach improved in vivo injured loss of function macrophage mouse model novel novel strategies novel therapeutics prevent programs therapeutically effective vascular inflammation

项目摘要

Summary/Abstract Abdominal aortic aneurysm (AAA) is a potentially lethal disease that lacks pharmacological treatment. Aortic wall inflammation and subsequent degradation of extracellular matrix (ECM) proteins, especially the elastin breakage, are the determining factors for the development of AAA. Vascular inflammation, particularly macrophage infiltration and inflammatory SMC phenotype, causes the production of proteolytic enzymes that disrupt ECM homeostasis leading to a weakened vessel wall and consequently AAA formation. However, there is a critical knowledge gap concerning the mechanism(s) or key factor(s) controlling both the vascular inflammation and the ECM dysregulation. Our exciting preliminary data indicate that dedicator of cytokinesis 2 (DOCK2) plays a central role in the induction of inflammatory SMC phenotype and AAA formation. DOCK2 deficiency (DOCK2-/-) in mice significantly attenuates AAA formation (with decreased elastin breakage and improved artery wall integrity) and diminishes the induction of inflammatory SMC phenotype. Consequently, DOCK2-/- inhibits the expression of monocyte chemoattractant protein-1 (MCP-1) and matrix metalloproteinase-2 (MMP2) in SMCs while restoring contractile SMC markers. Consistently, the macrophage infiltration in aneurysm arterial media is blocked in DOCK2-/- mice. Moreover, DOCK2 expression is associated with aneurysm formation in human patients. These data strongly support a novel hypothesis that DOCK2 induces inflammatory SMC phenotype leading to vascular inflammation, elastin breakage, and consequently AAA formation. Using primary mouse and human SMCs, in vivo DOCK2 SMC-, macrophage-, and T cell- specific knockout mouse models combining with molecular, cellular, histological, and pharmacological approaches, we will 1) determine the mechanisms by which DOCK2 regulates inflammatory SMC phenotype; and 2) test the hypothesis that DOCK2 promotes AAA formation by stimulating inflammatory SMC phenotype in vivo. Successful completion of the proposed studies will establish novel mechanisms regulating SMC inflammatory phenotype and vascular inflammation, which are likely to advance our understanding of the AAA formation and ultimately lead to novel strategies for developing effective therapeutics to treat AAA.

摘要/文摘