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The Role of Human Osteopontin Isoforms in Collateral Formation

人骨桥蛋白亚型在侧支形成中的作用

基本信息

批准号：
8833333
负责人：
Alicia N Lyle
金额：
$ 9.84万
依托单位：
EMORY UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2014
资助国家：
美国
起止时间：
2014-04-04 至 2016-02-29
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8833333
关键词：
Accounting Adhesions Affinity Aging Alginates Anatomy Arterial Occlusive Diseases Arteries Biological Assay Blood Vessels Blood capillaries Blood flow Bone Marrow Bypass CD44 gene Cardiovascular Diseases Cell Proliferation Cell Survival Cells Cessation of life Complementary DNA Complex Cytokine Signaling Data Development Disease Embryonic Development Encapsulated Endothelial Cells Exercise stress test Exhibits Exons Goals Growth Growth Factor Histology Human Image In Vitro Infiltration Inflammation Inflammatory Integrins Investigation Ischemia Lead Learning Length Life Limb structure Link Mediating Mesenchymal Stem Cells Molecular Mus Myocardial Infarction Operative Surgical Procedures Pathology Patients Perfusion Peripheral arterial disease Physiological Physiological Processes Play Post-Translational Protein Processing Process Protein Isoforms Proteins Reperfusion Therapy Rodent Role Signal Transduction Site Smooth Muscle Myocytes Stem cells Stroke Structure Subfamily lentivirinae Testing Therapeutic Tissues Tube United States Vascular Endothelial Cell Woman Work angiogenesis arteriole blood vessel development capillary career development cell motility cell type cellular imaging cytokine design immunocytochemistry in vivo interest macrophage men microCT migration mortality novel novel strategies novel therapeutic intervention osteopontin overexpression precursor cell receptor research study response translational approach vascular smooth muscle cell migration vasculogenesis

项目摘要

DESCRIPTION (provided by applicant): The development of new collateral blood vessels to provide blood flow to ischemic tissues is an extremely complex process that occurs as a result of several distinct mechanisms including sprouting of new blood vessels from existing vascular structures, migration of bone marrow-derived endothelial precursor cells to sites of ischemia, recruitment of inflammatory cells, and the arterialization of endothelial channels (both existing and newly formed) with vascular smooth muscle cells. While much has been learned about the involvement of growth factors in these processes, the precise molecular mechanisms underlying adaptive vascular growth mediated by other factors, such as inflammatory proteins, are extremely complex and require further investigation. By understanding the underlying mechanisms that drive collateral vessel formation, we can develop new therapeutic approaches to increase functional collateral growth in patients with obstructive arterial disease for which surgery is essentially the only available treatment. We have demonstrated that osteopontin (OPN), an inflammatory cytokine and matricellular protein, is integral to the formation of collateral vessel growth and its expression is significantly upregulated in response to ischemia. However, it has recently become evident that humans express three OPN isoforms (a, b, and c), which are differentially upregulated in various disease settings and may have different functions. There is currently nothing known about how these three OPN isoforms function to influence cell migration and collateral vessel formation in cardiovascular disease. Therefore, this career development proposal was designed to define the functional differences of the human OPN isoforms in the collateral formation process by using a novel and translational approach to deliver these OPN isoforms to ischemic tissues. Our preliminary data strongly support that human osteopontin isoforms differentially regulate collateral vessel formation, smooth muscle cell migration, and cell signaling. We therefore hypothesize that human OPN isoforms exhibit differential effects on collateral formation through divergent effects on the migration of inflammatory cells and vascular smooth muscle cells, necessary for arterialization. The experiments described in this application will dissect how these three human OPN isoforms function to modulate these responses. We propose to make use of osteopontin deficient mice to define the specific role of each human osteopontin isoform in new vessel formation and will test our overall hypothesis by investigating the following specific aims: 1) Define the role of human OPN isoforms on collateral vessel formation in vivo, 2) Investigate the differential effects of human OPN isoforms on vascular smooth muscle cell migration, and 3) Determine the mechanism by which human OPN isoforms mediate differential cell migration.

描述（由申请人提供）：为缺血组织提供血流的新侧支血管的发育是一个极其复杂的过程，是由几种不同机制导致的，包括从现有血管结构中萌生新血管、骨髓源性内皮前体细胞迁移到缺血部位、募集炎症细胞以及内皮通道（现有的和新的）动脉化。形成）与血管平滑肌细胞。虽然人们对生长因子在这些过程中的参与已经了解很多，但由其他因子（例如炎症蛋白）介导的适应性血管生长的精确分子机制极其复杂，需要进一步研究。通过了解驱动侧支血管形成的潜在机制，我们可以开发新的治疗方法来增加阻塞性动脉疾病患者的功能性侧支血管生长，而手术基本上是唯一可用的治疗方法。我们已经证明，骨桥蛋白（OPN）是一种炎症细胞因子和基质细胞蛋白，是侧支血管生长形成的组成部分，并且其表达在缺血时显着上调。然而，最近有证据表明，人类表达三种 OPN 亚型（a、b 和 c），它们在各种疾病环境中差异上调，并且可能具有不同的功能。目前尚不清楚这三种 OPN 亚型如何影响心血管疾病中的细胞迁移和侧支血管形成。因此，该职业发展提案旨在通过使用一种新颖的转化方法将这些 OPN 同工型递送至缺血组织，来定义人类 OPN 同工型在侧支形成过程中的功能差异。我们的初步数据强烈支持人骨桥蛋白亚型差异调节侧支血管形成、平滑肌细胞迁移和细胞信号传导。因此，我们假设人类 OPN 亚型通过对动脉化所必需的炎症细胞和血管平滑肌细胞的迁移产生不同的影响，从而对侧支循环的形成表现出不同的影响。本申请中描述的实验将剖析这三种人类 OPN 同工型如何发挥作用来调节这些反应。我们建议利用骨桥蛋白缺陷小鼠来确定每种人骨桥蛋白亚型在新血管形成中的具体作用，并将通过研究以下具体目标来检验我们的总体假设：1) 确定人 OPN 亚型对体内侧支血管形成的作用，2) 研究人 OPN 亚型对血管平滑肌细胞迁移的不同影响，3) 确定其机制人类 OPN 亚型介导差异细胞迁移。